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Basically the concave mirror will change it because of the curved look same thing with convex
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various physical characteristics of minerals are used to identify unknown specimens. match the test name with the appropriate description.
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Hardness, lustre, colour, streak, specific gravity, cleavage, fracture, and tenacity are only a few of the distinct physical characteristics that most minerals possess.
Hardness, lustre, colour, streak, specific gravity, cleavage, fracture, and tenacity are only a few of the distinct physical characteristics that most minerals possess. A mineral splits through cleavage. One, two, or three cleavage planes can be present in minerals. A mineral can scatter light in a lustrous manner. Metallic, vitreous, earthy, and silky are typical forms of lustre. A mineral's powder is coloured streak. The streak's hue will not always match that of the mineral. relative density is known as specific gravity for water. Some minerals will feel denser than others due to differences in chemical composition. Hardness is scratch resistance or susceptibility. rocky minerals
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various physical characteristics of minerals are used to identify unknown specimens. match the test name with the appropriate description.
Cleavage, Hardness
select all that apply which of the following options correctly describe the arrangement of the periodic table? select all that apply.
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Answer: may you please put the possible answers in your question so i can answer it.
Explanation:
several grams of a protein are added to 50 ml of water, and the mixture is stirred vigorously until the protein dissolves. after several days, the mixture appears homogeneous and shows no evidence of a solid. it is transparent to visible light and does not show the tyndall effect. based on these observations, the mixture can be classified as a
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The definition of a genuine solution is a homogenous mixture of two or more substances where the particle size of the material dissolved (solute) in the solvent is less than 10-9 m or 1 nm. A solution of simple sugar and water is an example of a true solution.
What is the name of a homogenous liquid mixture where the solute is evenly dissolved and distributed throughout the solvent (e.g., a 5 points colloid compound emulsion solution)?In the process of dissolving a solute in a solvent, a homogenous mixture known as a solution is created.
What kind of mixture can be homogenized?a combination of two or more materials that is homogenous. example: a water, sugar, and flavor combination (Coke). Not chemically or chemically connected, the substances are only physically combined.
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The left side of an NMR spectrum is described as _____field, and the right side is described as _____field.
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An NMR spectrums' left side is referred to as downfield, and its right side as upfield.
Nuclear magnetic resonance spectroscopy, commonly known as magnetic resonance spectroscopy (MRS) or NMR spectroscopy, is a spectroscopic technique for studying the local magnetic fields surrounding atomic nuclei. The nuclear magnetic resonance (NMR) signal is produced by radio waves excitation of the sample's nuclei and is detected by sensitive radio receivers. The sample is put in a magnetic field. The resonance frequency can be changed by the intramolecular magnetic field of an atom in a molecule, revealing details about the electronic structure and different functional groups of the molecule.NMR spectroscopy is the only method that can reliably identify monomolecular organic molecules in modern organic chemistry because the fields are different or highly specific to particular compounds.
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for the gas phase decomposition of 2-bromopropane, the rate constant has been determined at several temperatures. when in is plotted against the reciprocal of the kelv
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When the rate constant for the gas phase breakdown of two-bromopropane, CHz HBr, was calculated at various temperatures, a linear plot was produced with a slope of 22.55*104 K and a y-intercept of 29.9.
Who or what uses 2-bromopropane?Its liquid form is called 2-bromopropane. It is used to create other compounds, pharmaceuticals, and colors. An organobromide compound is 2-bromopropane. In organic synthesis, it is used to introduce the isopropyl functional group.
What is the shortened name for bromopropane?1-Bromopropane (1-BP; CAS number 106-94-5), commonly referred to as n-propyl bromide, is a halogenated short-chain alkane utilized as an organic solvent in a variety of commercial and industrial applications, such as the dry cleaning of clothing and the vapor degreasing of metals.
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relative acidity of an already charged compound (negatively charged as an example) versus its neutral form
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The substance turns basic if there are more positively charged hydroniums than negatively charged hydroxyls. The term "potential (or power) of hydrogen" actually denotes pH.
How does acidity relate to negative charge?Another method for distributing negative charge within a molecule is resonance. Its stability will rise if the conjugate base has a charge that can interact with nearby double bonds or p orbitals. The conjugate acid becomes more acidic as a result.
Do bases or acids have negative charges?The capacity of a base to draw in and hold a proton determines its strength. Because of this, bases frequently have negative charges and always contain at least one lone pair of electrons that can coordinately connect with a proton.
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Show how a dxz atomic orbital and a pz atomic orbital overlap to form a bonding MO, assuming the x-axis is the internuclear axis.
a. Would it result in the formation of a σ- or a π-MO? Explain your rationale.
b. Identify the number of node(s) which is/are perpendicular to the bond axis.
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Since the dxz atomic orbital and a pz atomic orbital do not overlap along the axis, they form a pi bond and would us a π-MO having one node
What is a pi bond?A pi bond (π bond) is a type of covalent bond that forms between two atoms by the overlap of their unhybridized p orbitals. Pi bonds are usually found in double and triple bonds between atoms, and they are weaker and less directional than the other type of covalent bond, known as the sigma bond (σ bond).
In a pi bond, the electrons occupy an orbital above and below the plane of the atoms. This creates a region of high electron density between the atoms, which leads to a stronger bond compared to a single bond.
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what is the effect of removing some water from the system in an equilibrium state given by the equation 2h2o2
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Removing some water from a system in an equilibrium state represented by the equation 2H2O2 (hydrogen peroxide) will shift the equilibrium towards the reactant side. The reaction will proceed in the reverse direction to produce more water and hydrogen peroxide until a new equilibrium is reached.
In an equilibrium state, the rate of the forward reaction is equal to the rate of the reverse reaction. The concentration of reactants and products at this point is constant, and any change in the concentration of either species will shift the equilibrium towards the side that will compensate for the change.
In the case of the reaction 2H2O2, removing some water will result in a decrease in the concentration of one of the reactants, which will disrupt the balance of the reaction. To reestablish the balance, the reaction will proceed in the reverse direction to produce more water and hydrogen peroxide, until a new equilibrium is reached. The reaction will continue to adjust until the concentration of reactants and products reaches a new constant value that corresponds to the new equilibrium.
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A student is trying to experimentally determine the density of water. He obtains a value of 0.72 g/mL. The actual value is 1.0 g/mL.
a. The error in his measurement is:
g/mL
b. The % error in his measurement is:
%
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A. The error in the student's measurement is 0.28
B. The % error in the student's measurement is 28%.
What is water density?
Density of water is approximately 1.0 g/mL (grams per milliliter) at standard temperature and pressure, which is defined as a temperature of 20°C (68°F) and pressure of 1 atm. The exact density can vary slightly depending on the temperature and pressure.
There are two main factors which affect the density of water such as
Temperature PurityA. The error in the student's measurement is 1.0 g/mL - 0.72 g/mL = 0.28 g/mL.
B. The % error in the student's measurement is (0.28 g/mL / 1.0 g/mL) * 100% = 28%.
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Will a precipitate form if a 190.0 mL of 0.0820 M solution of strontium nitrate (Sr(NO3)2) is added to 190.0 mL of 0.0210 M potassium oxalate (K2C2O4)? The Ksp of strontium oxalate is 1.14 x 10^-7.
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When 190.0 mL of 0.0820 M strontium nitrate [tex](Sr(NO_3)_2)[/tex] solution is added to 190.0 mL of 0.0210 M potassium oxalate ([tex]K_2C_2O_4[/tex]), a precipitate forms because the reaction between these two solutions produces strontium oxalate, which has a solubility product constant (Ksp) of 1.14 x 10 ⁻⁷.
The reaction between strontium nitrate and potassium oxalate can be represented by the following equation:
[tex]Sr(NO_3)_2 +[/tex] [tex]K_2C_2O_4 =[/tex] [tex]SrC_2O_4 +2KNO_3[/tex]
The solubility product constant (Ksp) is a measure of the maximum concentration of ions in a solution that will remain in the solution and not precipitate. When the ion concentration exceeds the Ksp, a precipitate forms.
The concentration of [tex]Sr^{2+}[/tex] ions in the solution can be calculated by multiplying the volume (380 mL) by the initial concentration (0.0820 M) of strontium nitrate:
[[tex]Sr^{2+}[/tex]] = [tex]\frac{0.0820*380}{1000}[/tex] = 0.0311 M
Since [[tex]Sr^{2+}[/tex] is greater than the Ksp of strontium oxalate (1.14 x 10⁻⁷), a precipitate will form when the two solutions are mixed.
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hydrogen bonds; dispersion forces
There are two equations used to calculate the heat gained/lost by a substance. Match each equation to its correct application.
A) Heating or cooling within a phase if moles are given
B) Heating or cooling during a phase change
C) Heating or cooling within a phase if mass is given
~q = ms∆T
~q = ns∆T
~q = n∆H°change
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If mass is supplied, then q = msT, nsT, or nH°change can be used to determine the heating or cooling within a phase in dispersion forces .
Is a dispersion force produced by hydrogen bonds?Despite being polar, C-H bonds are not extremely polar. The intermolecular dispersion forces would be the most important ones for this material. Hydrogen bonding will occur in this molecule because a H atom is joined to an O atom.
What about London dispersion and dipole-dipole hydrogen bonds?London dispersion forces (LDF), interactions between dipoles, and hydrogen bonds are the three different kinds of intermolecular forces. All substances have LDF at the very least, but molecules may have any combination of these three types of intermolecular interactions.
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Why does ice float on water?
Answers
Answer: Because of the evil critters in the water
Explanation: There are small evil critters that are invisible to the human eye in the water that HATE ice and when they see it they push away.
a new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu. the atomic weight is 40.50 g/mol. pick the true statement. select all that apply
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Statement A, "the isotope at 42.0 amu is less abundant", is true. This is because atomic weight is calculated using the relative abundances of the isotopes. Since the calculated weight is closer to the 40.0 amu isotope, this means that it must be more abundant.
There are two isotopes of a new element, one of which has a weight of 40.0 amu.A greater amount of the isotope exists at 40.0 amu.The two isotopes of a new element have masses of 40.0 and 42.0 amu, respectively.40.50 g/mol represents the atomic weight.
The mass number of an element's isotope can be calculated in what way?Isotopes are variations of a single atom that only differ in the quantity of neutrons in each one.An element's form is determined by the sum of the protons and neutrons in that element:Protons plus neutrons equal mass number.
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help pleaseeeeeeeeeeee
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The image that is shown contains an organized lesson content.
How do you organize a lesson content?The following steps should be taken to organize a lesson plan;
Identify the objective: Start by defining the objective of the lesson and what you want your students to learn by the end of it. This will help you create a clear and focused lesson plan.
Gather materials and resources: Identify any materials, resources, or technology you will need for the lesson and gather them ahead of time.
Plan the structure: Determine the flow of the lesson, including any key concepts or ideas you want to cover, and how you will introduce and conclude the lesson.
Consider the pace: Decide on the pace of the lesson, taking into account the attention span of your students, and plan activities that will keep them engaged and on task.
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one of the following ir spectra is that of acetaminophen and the other is of acetanilide. which of the spectra, a or b, do you think corresponds to acetaminophen?
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Spectrum A corresponds to acetaminophen.Paracetamol, also known as acetaminophen, is a medication used to treat fever and mild to moderate pain.
Common brand names include Tylenol and Panadol.The advantages of paracetamol usage for fever are unclear because, at a typical dose, it only marginally lowers body temperature; in that regard, it is inferior than ibuprofen. Acute mild migraines may be helped by paracetamol, however recurring tension headaches may only be minimally relieved. However, when the pain is minimal, the aspirin/paracetamol/caffeine combination is effective and is advised as a first-line therapy for both diseases. Ibuprofen is superior to paracetamol in terms of effectiveness for post-surgical pain management. Ibuprofen and paracetamol together have more potency and are better than either medicine alone.
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Calculate the freezing point and boiling point of each aqueous solution, assuming complete dissociation of the solute. c. 5.5% NaNO3 by mass (in water)
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The freezing point and boiling point of a solution can be calculated using the following formula:
Freezing Point = Kf x molality
Boiling Point = Kb x molality
where Kf and Kb are the freezing and boiling point constants respectively.
The molality of a solution is the number of moles of solute (NaNO3) in 1 kg of solvent (water). For this solution, the mass of the solute (NaNO3) is 5.5%, and the mass of the solvent (water) is 94.5%.
Therefore, the mass of NaNO3 = 5.5g/100g = 0.055g
The molar mass of NaNO3 = 85.0 g/mol
Therefore, the number of moles of NaNO3 = 0.055g/85.0 g/mol = 0.000647 mol
The mass of water = 94.5g/100g = 0.945g
Therefore, the molality of the solution = 0.000647 mol/0.945 kg = 0.000682 mol/kg
Using the reagents below, list in order (by letter, no period) those necessary to prepare trans-1,2-dibromocyclopentane from cyclopentane.
Note: Not all spaces provided may be needed. Type "na" in any space where you have no reagent. (There are 3 spaces)
a. Br2, heat, light
b. HBr
c. Br2
d. H2O
e. HBr, HOOH
f. EtOH
g. NaOEt, EtOH, heat
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a. Br2, heat, light, g. NaOEt, EtOH, heat, c. Br2 . Three separate processes are necessary to transform the stability cyclopentane into the dibromocyclopentane trans isomer.
What is the purpose of a cyclopentane?The polyurethane foams used to insulate freezers and refrigerators use cyclopentane as a blowing agent.Cyclopentane does not include hydro-fluorocarbons, in contrast to several other materials used to insulation refrigerators (HFCs).
Where can you find cyclopentane?The offering a wide variety ring is present in many valuable medications and other natural compounds.Prostaglandins, most steroids, and a few lipids are examples.
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How many grams are in 6.02x1023 formula units of Al2O3?
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The number of grams in 6.02 × 10²³ formula units of aluminium chloride is 101.96g.
How to calculate mass?The mass of a substance can be calculated from the formula units by dividing the number of formula units by Avogadro's number.
According to this question, there are 6.02 × 10²³ formula units of aluminum oxide. This means that;
no of moles = 6.02 × 10²³ ÷ 6.02 × 10²³
no of moles = 1 mole
molar mass of aluminium oxide = 101.96g/mol
mass of aluminum oxide = 101.96g/mol × 1 mole = 101.96g
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Which of the following forms a molecular solid?
a. CaO
b. C10H22
c. C (graphite)
d. gold
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C. C (graphite) forms a molecular solid.
Solids can be technically categorized as ionic, molecular, covalent (network), or metallic based on the type of forces holding the constituent atoms, molecules, or ions together. These four different types of interactions have a wide range of relative strengths that correlate well with those differences.
Atoms or molecules bound together by hydrogen bonds, London dispersion forces, or dipole-dipole forces make form molecular solids. characterized by weak conductivity, flexibility, and low melting points. Sucrose is a kind of molecular solid.
As a crystalline solid, graphite is composed of carbon atoms arranged in a regular hexagonal framework. The layers of graphite are made up of rings of six carbon atoms that are organized in horizontal sheets with large gaps between them. Thus, graphite forms a molecular solid in chemistry.
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Rate laws are determined experimentally by varying the concentrations of the reactants and observing the effect on the initial rate.
Concentration and rate data are provided in the table below for the reaction shown.
2NO(g) + Cl₂(g) → 2NOCI(g)
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The concentration of each reactant must be altered to ascertain the rate law of a reaction, and the influence on the starting rate must be noted.
What is Concentration?Concentration is a notion that is frequently used in chemistry and related domains. It is a measure of how much of one material is combined with another. The amount of a material, such as salt, that is present in a certain amount of tissue or liquid, such as blood. When there is less water present, a material becomes more concentrated. A solution's concentration is a measure of how much solute has been dissolved in a given quantity of solvent or solution. A concentrated solution contains a significant amount of dissolved solute. A dilute solution is one with a little quantity of dissolved solute.
Here,
I'm sorry, but the information provided is incomplete. To determine the rate law of a reaction, the concentration of each reactant needs to be varied and the effect on the initial rate must be observed. Data needs to be provided in the form of a table or graph to make the calculation.
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which of the following are characteristics of ionic compounds? check all that apply. which of the following are characteristics of ionic compounds? check all that apply. low melting points electrically neutral high melting points composed of two nonmetals
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The characteristics of ionic compounds are:
Low melting pointsHigh melting pointsComposed of two nonmetals.Ionic compounds are composed of two oppositely charged ions, usually a positively charged metal ion and a negatively charged nonmetal ion. These ions are held together by strong electrostatic forces of attraction, giving ionic compounds their crystalline form, high melting point, and electrical neutrality.
Ionic compounds are usually insoluble in organic solvents, but they are soluble in water. Ionic compounds usually have a high boiling point and are not flammable. The chemical formula of an ionic compound reflects the ratio of the ions present in the compound. The bond between the ions is strong, and the compound is electrically neutral as a whole.
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Which properties describe elements that are nonmetal gases? Select all that apply.
Multiple select question.
cross out
A)
composed of an extended structure
cross out
B)
composed of individual atoms or diatomic molecules
cross out
C)
high melting point
cross out
D)
low melting point
cross out
E)
strong attractions between particles
cross out
F)
weak attractions between particles
Answers
To identify the functional groups present in a compound _____
spectroscopy uses the ______ portion of the electromagnetic spectrum.
Answers
To identify the functional groups present in a compound IR. spectroscopy uses the Infrared portion of the electromagnetic spectrum.
How can the functional groups in the IR spectrum be distinguished?Due to the presence of both the N-H link and the C=O bond, an amide substituent combines the characteristics of amines and ketones.As a result, near the left side of the spectrum, around 3100 or 3500 cm-1 again for N-H stretch, amides exhibit a very strong, rather broad band.
How are functional groups recognized?To separate functional categories within the name, their prefixes and suffixes will differ.For instance, the primary amino group will employ the prefix "amino-" if it is a substituent and the suffix "-amine" if it is the highest priority group.
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Suppose you wish to find the % alcohol in a beverage. Alcohol has a density of 0.79 g/mL and water has a density of 1.00 g/mL. Describe how you would use a hydrometer to accomplish this task. What modification might you make in the hydrometer
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Check the alcohol concentration using a thermometer and a specific hydrometer called a saccharometer.
What is density?Density is the mass of a homogeneous material per unit volume. d = M/V, within which d is density, M is weight, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.
For instance, whereas Earth has a density of 5.51 milligrams, water has a density of 1 milligrams. Another way to state density is in kilograms per cubic meter (in metre-kilogram-second or SI units). Check the alcohol concentration using a thermometer and a specific hydrometer called a saccharometer.
Therefore, check the alcohol concentration using a thermometer and a specific hydrometer called a saccharometer.
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Please Help ASAP - 100 points + Brainliest!!!!!
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The heat that have been evolved is 888.4 kJ while the internal energy is 13 J
What is heat of combustion?The heat of combustion is typically determined through a calorimetric experiment, in which a substance is burned in a calorimeter and the heat released is measured and quantified. The heat of combustion can also be calculated from the chemical equation for the combustion reaction, using the principle of the conservation of energy.
Number of moles of the propane = 25 g/62 g/mol
= 0.4 moles
If 1 mole of propane gives out 2221 kJ
0.4 moles of propane would give out 0.4 moles * 2221/1
= 888.4 kJ
We know that;
ΔE = q + w
= 25 - 12
= 13 J
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fill in the blank. when three phosphate groups are covalently attached to adenosine,__is formed. group of answer choices adp atp p amp\
Answers
When three phosphate groups are covalently attached to adenosine, ATP is formed.
What are three phosphate groups and adenosine?At the cellular level, energy is utilized and retained as adenosine triphosphate (ATP). Adenine, ribose, and three serially connected phosphate groups compose up the structure of ATP, which is an nucleoside triphosphate. Adenine molecules are formed to ribofuranose molecules via a beta-N(9)-glycosidic interaction to synthesize the ribonucleoside adenosine.
What part does adenosine play?It performs as an analgesic, a vasodilator, an anti-arrhythmia prescription, a human metabolite, and a fundamental metabolite. It is part of the family of adenosines and is a purines D-ribonucleoside. Adenosine improves a person's desire seeking sleep or sleep drive. Thus according research, adenosine also influences the immune system and can diminish inflammatory processes.
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) based on the graph, determine the order of the decomposition reaction of cyclobutane at 1270k. justify your answer.
Answers
The order of a chemical reaction can be determined by examining the relationship between the concentration of the reactants and the rate of the reaction.
A graph of the concentration of reactants versus time can provide this information. To determine the order of the decomposition reaction of cyclobutane at 1270K, one would need to have a graph of the concentration of cyclobutane versus time at that temperature and then examine the slope of the graph. If the slope is proportional to the concentration of cyclobutane raised to a power, then the reaction is said to be of that power order. For example, if the slope is proportional to the concentration squared, the reaction is of second order. Justification of the answer would require a detailed analysis of the graph and comparison with the expected behavior for different reaction orders.
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choose the hydration shells that form around a potassium ion when potassium chloride ( kcl ) dissolves. notice the positive, negative, and partial charges.
Answers
When KCl dissolves in water, the K⁺ ion forms a positive hydration shell surrounded by water molecules with partial negative charges, while the Cl⁻ ion forms a negative hydration shell surrounded by water molecules with partial positive charges.
When potassium chloride (KCl) dissolves in water, the potassium (K⁺) ion is surrounded by water molecules with partial negative charges on the oxygen atoms. This creates a hydration shell with a net positive charge, as the positive charge of the potassium ion is balanced by the partial negative charges of the surrounding water molecules.
On the other hand, the chloride (Cl⁻) ion is surrounded by water molecules with partial positive charges on the hydrogen atoms, creating an hydration shell with a net negative charge.
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show that the fact that 92% of the sun's atoms are hydrogen is consistent with the statement that 73% of the sun's mass is made up of hydrogen.
Answers
A hydrogen atom has a mass that is around four times smaller than that of a helium atom.
Assume that N is the total number of atoms in the Sun.
The Sun contains 92% hydrogen atoms, leaving 8% for helium, as seen in Table 15.2, "The Abundance of Elements in the Sun." If MH is assumed to be the mass of an atom of hydrogen, then the mass of hydrogen plus the mass of helium equals the entire mass of the Sun, which is equal to 0.92 N MH + 0.08 N 4MH = MSun, giving us 1.24 N MH = MSun.
Hydrogen's fractional mass is 0.92/1.24, or 74%.
This estimate is 1% too high, albeit it is very near, due to the simple assumption that hydrogen and helium are the sole atoms.
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Correct question:
Show that the statement that 92% of the Sun’s atoms are hydrogen is consistent with the statement that 73% of the Sun’s mass is made up of hydrogen, as found in Table 15.2. (Hint: Make the simplifying assumption, which is nearly correct, that the Sun is made up entirely of hydrogen and helium.)
Reference:
Questions about Unit Conversion and Percentages. Please show work!
Answers
Unit conversions and Percentages include:
7. 64,000 acres and 25,899.881 hectares.
8. 2,500 cm
9. 31 mph.
10. 400 BTUs
11. 269.23 acres.
12. -89.23%.
How to solve conversions and percentages?7.) If 1 square mile gives 640 acres, then:
100 sqm = 100 x 640 = 64,000 acres.
For hectares, 1 acre is 0.40468564 hectares,
Therefore, 64,000 x 0.40468564 = 25,899.881 hectares.
8.) A tectonic plate moves 25,000 meters (25 km) in a million years. To convert this to centimeters per year, we use the conversion factor of 100 cm/m:
25,000 m / 1,000,000 years = 25 m/year
25 m/year x 100 cm/m = 2,500 cm/year
9.) To convert from kilometers per hour to miles per hour, you can multiply the speed in km/hr by 0.621371.
So, 50 km/hr = 50 x 0.621371 = 31 mph.
10.) A 60% efficient power plant means that 60% of the energy from the natural gas is converted into electricity, while the remaining 40% is lost as waste heat. The amount of waste heat produced would then be 40% of 1000 BTUs, or 40% x 1000 BTUs = 400 BTUs.
11.)Assume the total area of the natural area "A". Then, 35% of A would be 0.35 x A, and the remaining 500 acres would be A - 0.35 x A.
To find out how many acres are to be developed, subtract the 500 acres that are left untouched from the total area A:
A - 500 = A - 0.35 x A
A = 500 / (1 - 0.35) = 769.23 acres
So, the number of acres to be developed is 769.23 - 500 = 269.23 acres.
12.) To calculate the percentage change, use the formula:
percentage change = ((new value - original value) / original value) x 100
percentage change = ((7 - 65) / 65) x 100
percentage change = (-58 / 65) x 100
percentage change = -89.23%
So the concentration of mercury in the water supply changed by -89.23% over the ten-year period.
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