(i) If it is a hydrocarbon, the molecular formula can be determined by assuming that the peak at m/z 128 corresponds to the molecular ion (M+). The m/z 128 peak corresponds to M+, the molecular formula of the compound would be C8H16 (128 = 16 x 8).
(ii) If it contains one oxygen atom, the molecular formula can be determined by assuming that the peak at m/z 128 corresponds to the [M + 1]- ion. The m/z 128 peak corresponds to [M + 1]- the molecular formula of the compound would be C6H14O (128 = 14 + 16 + 16).
Hydrocarbons are organic compounds that are made up of only hydrogen and carbon atoms. They are the building blocks of organic chemistry and can be found in various forms, such as gases, liquids, and solids. The most common forms of hydrocarbons are methane, ethane, propane, butane, and pentane.
Hydrocarbons are widely used as fuel sources, as they are an important source of energy. They are also used as raw materials in the production of various chemicals, such as plastics, synthetic rubber, and detergents. Additionally, they play a critical role in the manufacturing of various household and industrial products, such as cosmetics, adhesives, and lubricants.
Hydrocarbons can be found in fossil fuels, such as coal, oil, and natural gas. The extraction and burning of these fossil fuels have had a significant impact on the environment, leading to air and water pollution, global warming, and other environmental issues.
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Drugs having an ester functionality e.g aspri could be quite_____in the presence of moisture
Answer:Do not take drugs its bad for health
Explanation:
use the simulation to estimate how many times higher the melting temperature is of the substance with the strongest possible attractive interactions in the simulation than the melting temperature of the substance with the weakest possible attractive interactions
A material's intermolecular forces of attraction are stronger in a substance with a higher melting point than they are in a substance with a lower melting point, according to forces of attraction.
What do forces of attraction consist of?
A force that brings together the atoms in a molecule is called a force of attraction. It is essentially a force of attraction in nature. Additionally, it can function between an ion and an atom. For different states of matter, such as solids, liquids, and gases, it varies.
The forces of attraction are greatest in solids because the molecules there are firmly bound, whereas they are least in gases since the molecules are spread out. In between the forces of attraction of solids and gases, there are liquids.
The forces of attraction that exist in the substances are what determine their physical attributes, including melting point, boiling temperature, and density.
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a student assisting with the experiment would observe all of the following about the electron transport chain except:
A student assisting with the experiment would observe that all of the following statements about the electron transport chain are true EXCEPT: option (C) i.e. Every single electron carrier is movable and hydrophobic.
This statement is false because electron carriers in the electron transport chain can be hydrophilic or hydrophobic, and they may be mobile or anchored to a membrane. Their properties, such as hydrophobicity and mobility, depend on their specific role in the electron transport chain and the organisms they are found in.
1. In the ETC, carriers travel inside the inner mitochondrial membrane, passing electrons from one to another and pumping protons across the inner mitochondrial membrane.
2. Therefore, they are mobile. In order to travel inside the hydrophobic interior of the membrane, we would expect them to all be hydrophobic.
3. However, cytochrome c is a highly water-soluble protein, unlike other cytochromes.
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Question - A student assisting with the experiment would observe all of the following about the electron transport chain EXCEPT:
A. Electrons are passed from carriers with lower reduction potential to those with higher reduction potential.
B. The first electron carrier is also a proton pump.
C. Every single electron carrier is movable and hydrophobic
D. The electron carriers can transport a maximum of 2 electrons.
indicate which molecule (a or b) in each pair has the higher boiling point. then, identify the intermolecular force that is primarily responsible for the difference: hydrogen bonding (hb), dipole-dipole (dd), or london dispersion (ld).
To identify which molecule in each pair has the higher boiling point, you will need to compare the strength of the intermolecular forces between them.
Generally, molecules with stronger intermolecular forces will have a higher boiling point than molecules with weaker intermolecular forces. The intermolecular forces that could be responsible for the difference in boiling points between molecules are hydrogen bonding (HB), dipole-dipole (DD), and London dispersion (LD).
Hydrogen bonding is the strongest of these forces, followed by dipole-dipole forces, and then London dispersion forces. Therefore, if the difference in boiling points between two molecules is very large, it is likely due to hydrogen bonding.
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From the following list of elements -Ar, H, Ga, Al, Ca, Br, Ge, K, O- pick the one that best fits each description. Use each element only once: an element that resembles aluminum.
The element that fits the description and resemble aluminum, is Al.
The element Al is part of the periodic table and is classified as a metal. It is a silvery-white, soft, nonmagnetic and ductile metal in the boron group.
Aluminum is the third most abundant element in the Earth's crust and the most abundant metal. It is an excellent conductor of heat and electricity, and it has a relatively high melting point and boiling point compared to other metals. Aluminum is also highly malleable and can be easily shaped and molded into almost any shape.
It also has excellent corrosion resistance and can be used in a wide variety of applications. Aluminum is often used in construction, as it is lightweight, strong and non-combustible. It is also used in the automotive industry, as it is a good conductor and is highly resistant to corrosion.
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The density is calculated below from the measurements. How many significant figures should the answer be reported with?
The number of significant figures is 2 sig figs
The mass of a substance per unit of volume is its density.
Density is most frequently represented by the symbol, however Latin letter D may also be used.
The formula for density is mass divided by volume:
Displaying the style "rho = frac mV" where
m is the mass, V is the volume, and is the density
Hence,
find the smallest number used in the calculation.
There are 2 digits used.
when solving, round to have 2 significant figures
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the central box of a boxplot has______ of the data above it. please type the correct answer in the following input field, and then select the submit answer button or press the enter key when finished. your answer:
The central box of a boxplot has the median of the data above it.
Median is a mathematical term used to describe the middle value of a set of data or a distribution. It is often used in statistics to describe the central tendency of a set of data. The median is calculated by arranging all the values in a set of data in numerical order and identifying the middle value. If the data set has an odd number of values, then the median is simply the middle value. However, if the data set has an even number of values, then the median is calculated by taking the average of the two middle values.
The median is considered to be a more robust measure of central tendency compared to the mean because it is less affected by extreme values or outliers. It provides a better representation of the central value of a data set when the distribution is skewed or has extreme values. In these cases, the mean can be greatly influenced by the outliers, leading to a misrepresentation of the central tendency.
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below is the lewis structure of the acetylene molecule.count the number of bonding pairs and the number of lone pairs around the right hydrogen atom in this molecule.
The number of bonding pairs and the number of lone pairs around the right hydrogen atom in this molecule is 1 in no. (bonding pairs) and 0 in no. (lone pairs).
The right hydrogen atom in this molecule is bonded to the carbon atom through a single bond. The carbon atom in turn has a total of four bonds: two with the hydrogen atoms and two with the other carbon atom in the molecule. In the Lewis structure, a single bond is represented by a line connecting two atoms. A pair of electrons shared between two atoms is called a bond pair. Thus, the right hydrogen atom has 1 bonding pair and 0 lone pairs. Lone pairs refer to electrons that are not involved in bonding but are present around an atom. In this molecule, the right hydrogen atom only has one bonding pair, and no electrons are present as lone pairs.
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CAN SOMEONE HELP WITH THIS QUESTION?✨
The percentage error, given that the measured density of the metal is 4.16 g/cm³, is 3.53%
How do I determine the percentage error?First, we shall determine the absolute error in the measurement. Details below:
Measured value = 4.16 g/cm³Accepted value = 4.018 g/mL = 4.018 g/cm³Absolute error = ?Absolute error = accepted value - measured value
Absolute error = 4.018 - 4.16
Absolute error = 0.142 g/cm³
Haven obtain the absolute error, we shall determine the percentage error. This can be obatined as follow:
Absolute error = 0.142 g/cm³Accepted value = 4.018 g/cm³Percentage error =?Percentage error = (Absolute error / accepted value) × 100
Percentage error = (0.142 / 4.018) × 100
Percentage error = 3.53%
Thus, we can conclude that the percentage error is 3.53%
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The initial concentrations or pressures of reactants and products are given for each of the following systems. Calculate the reaction quotient and determine the direction in which each system will proceed to reach equilibrium. (a) 2NH3 (g) ⇌ N2 (g) + 3H2 (g) Kc = 17; [NH3] = 0.50 M, [N2] = 0.15 M, [H2] = 0.12 M(b) 2NH3 (g) ⇌ N2 (g) + 3H2 (g) KP = 6.8 × 104 ; initial pressures: NH3 = 2.00 atm, N2 = 10.00 atm, H2 = 10.00 atm(c) 2SO3 (g) ⇌ 2SO2 (g) + O2 (g) Kc = 0.230; [SO3] = 2.00 M, [SO2] = 2.00 M, [O2] = 2.00 M(d) 2SO3 (g) ⇌ 2SO2 (g) + O2 (g) KP = 6.5 atm; initial pressures: SO2 = 1.00 atm, O2 = 1.130 atm, SO3 = 0 atm
The reaction quotient Q is a measure of the relative amounts of products and reactants present in a reaction at a given time. The equilibrium will be shifted towards left.
The correct option is A) Qc= 1.0 X 10-3 , proceeds right
The concentration of the reactants inside the catalyst particles is uneven. The reagent concentration is highest on the outer surface and lowest in the center, forming an exterior to interior decay profile. Product concentrations have an inverse distribution. It is important to determine the concentration distribution within the catalyst particle, as the reaction rate at a given temperature is determined only by the concentration.
The expression for the reaction quotient is,
Q = [N₂][H₂]³/ [NH₃]²
= 1 × 1³/0.2²
= 25
But K=17.
Therefore, the value of the reaction coefficient is greater than the value of the equilibrium constant. That is, the concentration of the product is greater than equilibrium. So the balance shifts to the left.
Complete Question:
The initial concentrations or pressures of reactants and products are given for the following system. Calculate the reaction quotient and determine the direction in which each system will proceed to reach equilibrium.
2NH3 (g) ⇌ N2(g) + 3H2 (g), Kc =17; [NH3] = 0.50 M, [N2] = 0.15 M, [H2] = 0.12 M
A. Qc= 1.0 X 10-3 , proceeds right
B. Qc= 1.0 X 103 , proceeds left
C. Qc= 1.0 X 10-2 , proceeds right
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Draw the major organic product ol the following sequence of reactions Show stereochemistry In the product: HSCe OH TsCl, pyridine NaCN
Treatment of an alcohol with TsCl in pyridine gives retention of stereochemistry.The alcohols are treated with the TsCl in presence of weak bases such as pyridine. This results in the sulfonate esters.
Alcohols can be transformed to alkyl Tosylate by reacting with p-toluene sulfonyl chloride (TsCl) and pyridine. In this reaction, alcohol, which is a poor leaving group, is substituted by Tosylate, which is a good leaving group.sCl or p-toluenesulfonyl chloride is a reagent that converts the hydroxyl group . The alcohols are treated with the TsCl in presence of weak bases such as pyridine. This results in the sulfonate esters. The secondary alcohol given in the question reacts with TsCl or p-toluenesulfonyl chloride in presence of weak base pyridine .this reaction convert group into the group. that is the tosyl group is treated with the acetate ion in presence of tetra butyl amine in DMF. This reaction replaces the tosyl group with acetate ion. Tosyl group is a good leaving group. It tends to leave the molecule .thus in the presence of an incoming group acetate ion it is removed from the molecules.
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18. Underline the significant zeros in the following numbers
a. 5.08
b. 508
c. 5.080 x 10³
d. 0.05080
According to significant figures, the significant zeros in the following numbers are 5.08 b. 508 c. 5.080 x 10³ d. 0.05080.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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which of the following best describes a black object? HELP ASAP
A. An objects that reflects all colors of light
B. An object that absorbs all colors of light
C. An object that reflects some colors of light and reflects others
D. An object that refracts all colors of light
Answer:
B
Explanation:
A black colour object absorbs all wavelengths of light and reflects none. Therefore, black colour objects will absorb more heat. Objects that are white, on the other hand, reflect all wavelengths of light and therefore absorb the least heat.
the following is a list of the acid-base properties of some amino acids with ionizable side chains. which amino acid has the greatest isoelectric point?
The isoelectric point (pI) is the pH at which an amino acid or protein.
Which amino acids have Ionisable side chains?Functional groups of amino acids in enzymes present have the ability to readily ionize. other amino acids which have ionizable side chains. These include arginine, aspartic acid, cysteine, glutamic acid, histidine, lysine and tyrosine.
What are the 4 types of amino acid side chains?There are basically four different classes of amino acids determined by different side chains: (1) non-polar and neutral, (2) polar and neutral, (3) acidic and polar, (4) basic and polar. Principles of Polarity: The greater the electronegativity difference between atoms in a bond, the more polar the bond.
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identify what each ghs symbol signifies about the type of chemical present in a bottle or storage cabinet. what is the correct order for corrosive chemicals, flammable chemicals and oxidizing chemicals
Two liquids are being poured: one is an oxidising chemical and the other is corrosive, flame-flammable chemical. Away from other chemicals, especially flammables, keep oxidizers.
How are chemicals arranged?Chemicals ought to be kept in hazard class storage (i.e. flammable with flammable, oxidizers with oxidizers, etc.) During storage, incompatible compounds need to be physically separated from one another. Direct sunlight or intense local heat shouldn't be allowed to touch chemicals. Corrosives should not be near anything with which they might react.
How can a GHS pictogram be recognized?Each pictogram is a symbol on a white backdrop with a red border that denotes a specific danger (s). The classification of the chemical danger determines the pictogram on the label. OSHA will require the use of only eight of the nine pictograms that the GHS employs.
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propane, , is widely used in liquid form as a fuel for barbecue grills and camp stoves. for of propane, calculate the following quantities. round each of your answers to significant figures.
a.1.54 mole have 3significant figures
b.55.39g of carbon have 4significant figures
In positional notation, significant figures are the digits in a number that are trustworthy and required to denote the amount of something.
a)Determination of the number of mole in 67.7g pf C3H8.
mass of C3H8=67.7g
molar mass of C3H8 =(3*12)+(8*1)=44g/mol
number of mole of C3H8=..?
number of mole=mass/molar mass
number of mole of C3H8=67.7/44
Number of mole of C3H8=1.54mole
The significant figure for 1.54 mole is 3SF
b)Determination of the mass if carbon in the compound.
This is illustrated below:
The mass of C in compound can be obtained as follow:
= 3C/C3H8*67.7
=3*12/44*67.7
=36/44*67.7
=55.39g
Therefore,55.39g of carbon is present in the compound.
The significant figures for 55.39g is 4SF
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complete question:Propane (C3H8) is widely used in liquid form as a fuel for barbecue grills and camp stoves. For 67.7 g of propane, determine the following.(a) Calculate the moles of compound.mol(b) Calculate the grams of carbon.g .round each of your answers to significant figures.
the product of a reaction between 1-propene and hydrobromic acid will result in which of the following?
2-Bromopropane is created when hydrobromic acid and propene undergo an addition process. The identical reaction results in 1 bromopropane when benzoyl peroxide is present.
Explain the Markovnikov rule using the reaction between propene and HBr.While the halide group attaches to the carbon atom with the most alkyl substituents when a protic acid (HX) is introduced to an asymmetric alkene, the acidic hydrogen adheres to the carbon with the most hydrogen substituents.
What is accurate for the alkene-HBr reaction in the presence of peroxide?The free-radical mechanism governs the addition reaction of HBr to an asymmetrical alkene in the presence of peroxide. Here, bromine radical is formed which reacts with an alkene and produces an anti-markovnikov product.
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complete each statement by dragging the proper word into the appropriate blank and then place each sentence in order from the strongest to weakest chemical bond.
1. Bonds formed by equal sharing of a pair of electrons are called nonpolar covalent bonds because there is a uniform charge across the molecule along all axes.
2. Non-uniform or unequal sharing of a pair of electrons produces a polar covalent bond where a relative charge distribution is seen across the molecule.
3. Bonds formed when two atoms or compounds respectively donate and receive electrons are called ionic bonds and readily dissociate in water.
4. Attractions between polarized molecules (intermolecular bonding) are called hydrogen bonds and can also form between polarized regions of the same molecule (intramolecular bonding).
5. Attractions between adjacent atoms due to constantly fluctuating electron clouds are called Van der Waals forces.
Van der Waals forces are the weak intermolecular forces that exist between molecules. They are the result of the fluctuating dipoles created by the movement of electrons within a molecule. These forces can cause the molecules to attract or repel one another, leading to the formation of temporary bonds.
The strength of Van der Waals forces is much weaker than other forces like covalent or ionic bonds, but they play a significant role in determining the properties of liquids and gases. For example, the weak nature of these forces means that liquids have a lower boiling point compared to solids.
Van der Waals forces are also responsible for the phenomenon of adsorption, where molecules stick to a surface, and for the formation of supramolecular structures like micelles, vesicles, and liquid crystals. These forces are also crucial in determining the stability of large biomolecules like proteins and DNA.
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Complete Question:
Complete each statement by dragging the proper word into the appropriate blank and then place each sentence in order from the strongest to weakest chemical bond.
1. Bonds formed by equal sharing of a pair of electrons are called ______ covalent bonds because there is a uniform charge across the molecule along all axes.
2. Non-uniform or unequal sharing of a pair of electrons produces a _____ covalent bond where a relative charge distribution is seen across the molecule.
3. Bonds formed when two atoms or compounds respectively donate and receive electrons are called _______ bonds and readily dissociate in water.
4. Attractions between polarized molecules (intermolecular bonding) are called ______ bonds and can also form between polarized regions of the same molecule (intramolecular bonding).
5. Attractions between adjacent atoms due to constantly fluctuating electron clouds are called ______ forces.
using your knowledge of type iii immune complex-mediated reactions (chapter 4) hypothesize possible pathophysiologic changes as a result of obesity.
Type III immune complex-mediated reactions refer to the formation and accumulation of immune complexes in the body, which trigger an immune response that can lead to tissue damage. Obesity is associated with chronic low-grade inflammation, which can result in the formation of immune complexes.
Hypothetically, some possible pathophysiologic changes as a result of obesity may include:
Inflammation: Obesity is associated with chronic low-grade inflammation, which can lead to the formation of immune complexes. These immune complexes can then trigger an immune response, leading to further tissue damage and inflammation.
Tissue damage: Immune complexes can cause tissue damage by activating the complement system, which leads to the release of cytokines and other pro-inflammatory molecules that can cause inflammation and tissue damage.
Atherosclerosis: Immune complexes can deposit in the walls of blood vessels, triggering an immune response that contributes to the development of atherosclerosis, which is the build-up of fatty deposits in the arteries.
Insulin resistance: Chronic inflammation associated with obesity can also lead to insulin resistance, which is a condition where the body becomes less sensitive to insulin and less able to effectively regulate blood sugar levels.
Non-alcoholic fatty liver disease (NAFLD): Immune complexes can also accumulate in the liver, triggering an immune response that contributes to the development of NAFLD, a condition in which excess fat accumulates in the liver and causes liver damage.
These are some of the potential pathophysiologic changes that can occur as a result of obesity and the accumulation of immune complexes. It is important to note that these changes can lead to the development of a wide range of chronic diseases, including cardiovascular disease, diabetes, and liver disease, among others.
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a vessel containing the following gases is analyzed by a scientist: he, ne, ar, kr which of the following gases would be moving the slowest? a. Ne b. Ar c. Kr d. He
The gas moving the slowest would be Argon (Ar). The speed of a gas molecule is determined by its temperature, which is related to its average kinetic energy.
The gas moving the slowest would be Argon (Ar). The speed of a gas molecule is determined by its temperature, which is related to its average kinetic energy. In general, the heavier a gas molecule is, the slower it will move, as it takes more energy to get it moving. Among the gases listed, Argon has the heaviest molecular weight and therefore would be expected to move the slowest. Helium (He) has the lightest molecular weight and would be expected to move the fastest, followed by Neon (Ne), Krypton (Kr), and Argon (Ar) in order of increasing molecular weight.
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(a) a saturated solution is prepared by dissolving pbi2(s) in distilled water until no more solid dissolves. write a mathematical expression that can be used to determine the value of s , the molar solubility of pbi2(s) . (do not do any numerical calculations.)
The molar solubility (s) of PbI2 (s) in distilled water can be determined by the equation: s = [PbI2] / (1 + Ksp / [I-])
Where [PbI2] is the concentration of PbI2 in the solution, [I-] is the concentration of iodide ions in the solution, and Ksp is the solubility product constant of PbI2
The quantity of ions dissolved per litre of solution is measured by molar solubility. The quantity of ions that are dissolved in this situation's amount of solvent is represented as solubility.
The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant, Ksp. It stands for the degree of solute dissolution in solution. A substance's Ksp value increases with how soluble it is.
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Select the correct answer. When an atom in a reactant gains electrons, what happens to its oxidation number? A. Its oxidation number decreases. B. Its oxidation number doubles. C. Its oxidation number increases. D. Its oxidation number increases by one. E. Its oxidation number stays the same.
When an atom in a reactant gains electrons, its oxidation number increases. Option C.
What is oxidation?Oxidation is defined in several ways:
It is the addition of oxygen or the removal of hydrogenIt is an increase in the oxidation number of atomsIt is a gain of electronsIt is an addition of an electronegative element or the removal of an electropositive element.In other words, a gain of electrons also translates to an increase in the oxidation number of atoms.
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Calculate the mass in grams of each elemental sample.
(a) 1.32 × 1020 uranium atoms
(b) 2.55 × 1022 zinc atoms
(c) 4.11 × 1023 lead atoms
(d) 6.59 × 1024 silicon atoms
The mass of 1.32 × 10²⁰ U atoms is 0.47 g and that of 2.55 × 10²² Zn atoms is 2.76 g Similarly the mass of 4.1 × 10²³ Pb atoms is 141.4 g and that of 6.59 × ²⁴ Si atom is 30.7 g.
What is atomic mass?The atomic mass of an element is the mass of one mole of that element. One mole of an element contains 6.02 × 10²³ atoms. This number is called Avogadro number.
The number of moles of 1.32 × 10²⁰ U atoms = 1.32 × 10²⁰ /6.02 × 10²³ = 0.0002 moles.
atomic mass of U = 238.02 g/mol.
then mass of 0.0002 = 0.0002 mol × 238 g/mol = 0.47 g.
The number of moles of 2.55 × 10²² Zn atoms = 2.55 × 10²²/6.02 × 10²³ = 0.042 moles.
atomic mass of Zn = 63.5 g/mol.
then mass of 0.042 mol = 0.042 mol × 65.3 g/mol = 2.76 g.
The number of moles of 4.1 × 10²³ Pb atoms = 4.1 × 10²³ /6.02 × 10²³ = 0.68 moles.
atomic mass of Pb = 207.2 g/mol.
then mass of 0.68mol = 0.68 mol × 207.2 g/mol = 141.4 g.
The number of moles of 6.59 × ²⁴ Si atoms = 6.59 × ²⁴ /6.02 × 10²³ = 1.09 moles
atomic mass of Si = 28.08 g/mol.
then mass of 1.09 mole = 1.09 mole × 28.08 g/mol = 30.7g
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which of the following is not a characteristic of ribozymes? they are rna molecules. they are substrate specific. they enhance the reaction rate. they emerge from the reaction changed.
They alter as a result of the reaction. is not a quality that ribozymes possess.
What role does ribozyme play?In a nucleic acids molecule, ribozymes, which are RNA molecules, can both break and create covalent bonds. These compounds can bind and cleave an mRNA substrate with even larger potential advantages then antisense oligodeoxynucleotides.
What are ribozymes' two key functions?Ribozymes, also known as catalytic RNA, are proteins that link amino acids to build protein chains. They are located in the ribosome. In addition to these crucial processes, ribozymes also participate in RNA splicing, transferred RNA production, and viral replication.
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write formulas/charges or names as appropriate for each of the following monatomic ions 1. magnesium ion
A monatomic ion is a type of monatomic atom technically speaking. However, the term "monatomic atom" typically refers to an element's neutral atom. Krypton (Kr) and neon atoms are two examples (Ne).
Which atomic groupings contain monatomic ions?Cations that have a single conceivable charge are known as monatomic cations. Only Group IA (alkali metals, +1), Group IIA (alkaline metals, +2), zinc (Zn2+), aluminum (Al3+), and silver (Ag+) contain these ions.
Why are ions monoatomic or polyatomic?An ion that has more than one atom is called polyatomic since the word poly- signifies numerous. This sets polyatomic ions apart from monatomic ions, which are made up of a single atom.
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Please Help me ASAP - Next 90 minutes!! With my Homework Assignment!
100 Points + Brainliest if correct! Both questions please!!!!
Answer:
see below
Explanation:
1) here we are given that one mole of propane releases 2221kJ of energy.
now use unitary method as ,
to burn 1 mol (44g) propane 2221kJ of energy is required
to burn 1g of propane 2221kJ/44g of energy is required
therefore to burn 25g of propane 2221/44*25kJ of energy is required= 1261.93kJ ≈ 1262 kJ
Hence 1262kJ of energy is required to burn 25g propane.
2) amount of heat absorbed= 25kJ
amount of work done = 12J
change in energy= (25-12)kJ = 13kJ
Hence the value of ∆E is 13kJ .
and we are done!
Can Someone help with this please
The rate law is; Rate = k[X] [Y]
What is the rate law?
The rate law is an equation that describes how the rate of a chemical reaction is dependent on the concentrations of the reactants. The rate law provides information about the rate of a reaction and the effect of changing the concentrations of reactants on the reaction rate.
The rate law can be expressed as:
rate = k [A]^m [B]^n
We have to note that for X;
1.4 * 10^-3/7.0 * 10^-4 = 0.4/0.2
2= 2^n
n = 1
For Y;
2.8 * 10^-3/1.4 * 10^-3 = 0.4/0.2
2 = 2^n
n = 1
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draw curved arrows on the structures to show the reaction between hydroxide ion and bromocyclohexane. draw curved arrows on the structures to show the reaction between hydroxide ion and bromocyclohexan
The reaction between hydroxide ion (OH-) and bromocyclohexane can be an SN2 reaction, which is a type of nucleophilic substitution reaction.
In an SN2 reaction, a nucleophile attacks the substrate from the back side, leading to a concerted (one step) process in which the substrate and nucleophile exchange places. In the reaction between hydroxide ion and bromocyclohexane, the hydroxide ion acts as the nucleophile and attacks the substrate (bromocyclohexane) from the back side, resulting in the formation of a tetrahedral intermediate. This intermediate then collapses, leading to the formation of a new bond between the carbon and the oxygen atom of the hydroxide ion and the breaking of the bond between the carbon and the bromine atom.
Overall, the reaction can be summarized as:
Bromocyclohexane + OH- → Hydroxylcyclohexane + Br-
Note that the reaction conditions, such as temperature and solvent, can affect the rate and mechanism of the reaction.
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after 65 minutes, the amount of a particular radioisotope remaining is 3.13% of the initial amount. what is the half life of the radioisotope?
Answer:
13 mins
Explanation:
We need to find how many half lives are required to reach .0313
.0313 = 1/2^n log both sides and solve for n
log.0313 / log (1/2 ) = n where n= NUMBER of halflives
n = ~ 5 half lives
these 5 half lives took up 65 minutes
so EACH half life is 65/5 = 13 mins
if na2so4 is added to a saturated aqueous solution of ag2so4, the solubility of ag2so4 will ______ . group of answer choices increase decrease stay the same double
The correct option is B, if na2so4 is added to a saturated aqueous solution of ag2so4, the solubility of ag2so4 will decrease .
Solubility is a term used to describe the ability of a substance to dissolve in a solvent, such as water, to form a homogeneous solution. The solubility of a substance is determined by several factors, including temperature, pressure, and the type and concentration of the solvent. Some substances have a high solubility and can dissolve in large quantities, while others have low solubility and can only dissolve in small amounts. The solubility of a substance can also be influenced by its chemical structure, and how it interacts with the solvent.
The solubility of a substance can be useful in a variety of applications, such as in the pharmaceutical industry, where the solubility of a drug can impact its effectiveness. Solubility can also be important in the food and beverage industry, as the solubility of ingredients can affect the texture and taste of a product. Understanding solubility can also help in environmental issues, as solubility can determine the ability of pollutants to dissolve in water and affect aquatic life.
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