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
which of the following properties of substances are physical properties? select all that apply. multiple select question. melting point mass color combustibility reactivity
NOT A and C for the following reason: Combustibility and Reactivity are chemical properties since they involve changing one substance into another.
Color, density, hardness, melting and boiling points are examples of physical qualities along with hardness. Matter has a variety of physical characteristics, such as color, hardness, malleability, solubility, electrical conductivity, density, melting point, and boiling point. The colors of the elements are quite consistent from one element to the next. The mass-to-volume ratio, color, odor, hardness, and volume are a few examples of the physical characteristics of matter. Other characteristics include color, which interacts with visible light, hardness, and volume. Chemistry characteristic. Because combustion is a chemical reaction, a substance's combustibility—a feature that determines whether it will experience a combustion reaction—is a chemical attribute. c. color: A material quality.
Question
Which of the following properties of substances are physical properties? Select all that apply
a. Combustibility
b. Color
c. Reactivity
d. Melting Point
e. Mass
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I need help solving this chemical equation. Thank you. Step by step explanation of it also.
Balance the following equation:
3Cu (s) + 8HNO₃ (aq) ⟶ 3Cu(NO₃)₂(aq) + 2NO (g) + 4H₂O (l)
Reaction equilibrium is a condition where the components of the reactants and reaction products remain in the system, in a state of equilibrium the rate of the reaction to the right is equal to the rate of the reaction to the left.
Cu → Cu²⁺ + 2e⁻ ⟶ Equation (1)
NO₃⁻ + 4H⁺ + 3e⁻ ⟶ NO + 2H₂O ⟶Equation (2)
Equation (1) × 3+ Equation (2) ×2(for equalising electrons)
3Cu ⟶ 3Cu²⁺ + 6e⁻
2NO₃⁻ + 8H⁺ + 6e⁻ ⟶ 2NO + 4H₂O
___________________________________
3Cu + 2NO₃⁻+ 8H⁺ ⟶ 3Cu²⁺ + 2NO + 4H₂O
But 8H⁺ + 8NO₃⁻ ⟶ 8HNO₃
The 6 NO₃²⁻ combine with Cu²⁺
So, balanced equation is:
3Cu (s) + 8HNO₃ (aq) ⟶ 3Cu(NO₃)₂(aq) + 2NO (g) + 4H₂O (l)
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Q1)Which of the following is a chemical reaction? Freezing liquid Mercury Adding yellow to blue to make green Cutting a piece of paper into two pieces Dropping a sliced orange into a vat of Sodium Hydroxide Filling a balloon with natural air Painting a wall blue A bicycle rusting Ice cream melting Scratching a key across a desk Making a sand castle Q2) Which of the following is a physical reaction? Frying an egg Digesting carrots A Macbook falling out of a window Creating ATP in the human body Dropping a fizzy tablet into a glass of Water Shattering Glass with a baseball Corroding Metal Fireworks Exploding Lighting a match Baking a cake
Whenever the bonds between the reactant and product molecules are broken or new bonds are built and formed, a chemical reaction takes place and a new substance is created.
What seven chemical processes are there?Combustion, decomposition, neutralization, redox, precipitation or double-displacement, and synthesis are some of the numerous types of reactions that can occur depending on the product that is produced.
What are the 5 main chemical reactions?Combustion, combination, decomposition, single-replacement, and double-replacement are the five fundamental categories of chemical reactions. You can categorize a reaction by looking at the reactants and outcomes of the reaction in question.
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Which of the following reactions can be used to synthesize an aldehyde as the reaction product? Select all that apply.A) Reduction of esters using DIBAL-HB) Hydroboration-oxidation of a terminal alkyneC) Reduction of carboxylic acids using LiAlH4D) Oxidation of a primary alcohol with PCC.E) Hydroboration-oxidation of an internal alkyne.
Reactions that can be used to synthesize an aldehyde as a reaction product are:
Reduction of esters using DIBAL-H.Reduction of carboxylic acids using LiAlH4.Oxidation of a primary alcohol with PCC.The other two options (B and E) do not result in the synthesis of an aldehyde as a reaction product.
Correct answer: letters A, C and D.
Extending the explanation of the above reactions, the reduction of esters using DIBAL-H involves the addition of a hydride to the carboxylate, resulting in the formation of an alkoxide which is then hydrolyzed to a primary alcohol.
The hydroboration-oxidation of a terminal alkyne involves the addition of a borane to the alkyne, resulting in the formation of a boronate ester which is then oxidized to a ketone. The reduction of carboxylic acids using LiAlH4 involves the addition of a hydride to the carboxyl group, resulting in the formation of an alkoxide which is then hydrolyzed to a primary alcohol.
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the carbon skeletons of which two amino acids enter metabolism at the level of pyruvate? choose the best answer(s) from the list below. 1- alanine and serine 2- alanine and cysteine 3- serine and asparagine 4- alanine and aspartate
The best answer 1 and 2, the carbon skeletons of which two amino acids enter metabolism at the level of pyruvate are alanine and serine or alanine and cysteine.
Metabolism refers to the chemical processes that occur within an organism to maintain life. These processes include the breakdown of nutrients to release energy and the synthesis of molecules that the body needs for growth and repair. There are two main types of metabolism: catabolism, which involves the breakdown of molecules to release energy, and anabolism, which involves the synthesis of molecules using energy.
The rate at which an individual's metabolism operates can affect their weight, with a faster metabolism generally leading to a higher rate of calorie burn and a slower metabolism leading to a lower rate of calorie burn. However, factors such as genetics, age, and sex also play a role in determining an individual's metabolism. Additionally, lifestyle factors such as diet and physical activity can also impact metabolism, with regular exercise and a balanced diet known to help boost metabolism.
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Please help ASAP ,100 points!
Researching solutions
In this task, you will conduct research and present your findings on the Haber process ( also called the Haber-Bosch process) and its historical significance. In the Haber process, nitrogen and hydrogen are converted to ammonia. You will compare the Haber process with the results you obtained from the simulation. Your presentation will consist of 10 to 15 slides, built using presentation software.
Part A
When designing a science presentation, look for credible sources. science doesn’t show bias, but humans do. Avoid sites and articles that provide facts with citing proper scientific evidence. You must be able to identify reliable sites so the data in your presentation is credible.
Use sources with URLs that end in .gov, such as CDC.gov. Government sites are reliable sources. You can also use sistes with URLS ending in .edu. they are usually trustworthy, but sometimes students, rather than scientists, write conent for .edu websites. Always identify the author of the source before proceeding. some .org and .com sites are credible, but it’s important to verify their authenticity. When reviewing a source, ask these questions:
• Who is the author?
•Is this person a chemistry expert?
• What is the document’s purpose?
• Does the documents state facts that scientists can support with evidence?
• Are there opinions in the document?
• How old is the document?
• Do other credible sources support the statements in the document?
Search for credible websites or publications on the Haber process and its inventors. Write down atleast two sources you will use for your presentation, and cite them using Modern Language Association (MLA) citation methods.
Here are two sources you could use for your presentation on the Haber process:
"The Haber-Bosch Process: Feeding the World with Ammonia." Chemical Safety Facts, American Chemistry Council, 2020, https://www.americanchemistry.com/Education/Resources/High-School/Chemical-Safety-Facts/The-Haber-Bosch-Process-Feeding-the-World-with-Ammonia.html
"The Haber Process." Royal Society of Chemistry, 2020, https://www.rsc.org/periodic-table/element/1/nitrogen/the-haber-process
MLA citation for source 1:
"The Haber-Bosch Process: Feeding the World with Ammonia." Chemical Safety Facts, American Chemistry Council, 2020, https://www.americanchemistry.com/Education/Resources/High-School/Chemical-Safety-Facts/The-Haber-Bosch-Process-Feeding-the-World-with-Ammonia.html
MLA citation for source 2:
"The Haber Process." Royal Society of Chemistry, 2020, https://www.rsc.org/periodic-table/element/1/nitrogen/the-haber-process
chlorine gas and solid potassium react to produce solid potassium chloride . write a balanced chemical equation for this reaction.
A balanced chemical equation is one that contains the same number of atoms on the reactant and product sides.
For instance, a synthesis process results in the development of solid potassium chloride when chlorine gas combines with solid potassium.
The following reaction equation will apply.
Cl_2(g)+K(s)--> KCL
These are the atom counts on the reactant side.
Cl = 2
K = 1
The product side atom count is as follows.
Cl = 1
K = 1
Therefore, multiply K on the reactant side by 2 and multiply KCl on the product side by 2 to balance this chemical equation.
Cl_2(g)+K(s)--> KCL
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which best describes the solution at point c? a. saturated b. desaturated c. unsaturated d. supersaturated
Saturated, unsaturated, and supersaturated are three terms used to characterize solutions. These are the right responses.
How saturated, unsaturated, or supersaturated is the solution?Less solute is present in an unsaturated solution than the solution can dissolve. In comparison to saturated solutions, supersaturated solutions have more dissolved solute and may dissolve more solute at a given temperature. Solutions that have less dissolved solute than the solvent's saturation point are said to be unsaturated solutions (at that specific temperature gradient).
What distinguishes saturation from supersaturation?A saturated solution is one that dissolves the most solute possible at a particular temperature. To saturate it, a solution containing more solute than that is needed.
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The given question is incorrect. The correct question is:
Which can best identify how solutions can be classified based on solubility?
a. unsaturated
b. desaturated
c. saturated
d. supersaturated
oxalic acid formula
show the mechanism for the generation of the acylium ion of an acid anhydride is used instead of an acyl chloride for the source of the acylium ion
The complex's C-Cl bond breaks down to produce an acylium ion. Positively charged and resonance stabilized, the acylium ion has a carbon atom.
What processes lead to acylation?In numerous acylation processes, succinic acid is frequently utilized. Two or more succinic acid salts can combine to create a single chemical through a process known as acylation. To stop the rearrangement processes that happen during the alkylation process, the acylation procedure is performed.
Where is acylation found?It is known as N-acylation (amide linkage), S-acylation (thioester linkage), or O-acylation (ester linkage) depending on which amino acid residues (Lys, Cys, Ser/Thr) are commonly subjected to the acylation process.
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if a mixture of two moles each of gases A and B are mixed to give a total pressure of 20 atm pressure. calculate the partial pressure of gases A and B
If a mixture of two moles each of gases A and B are mixed to give a total pressure of 20 atm pressure, the partial pressure of gases A and B is 10 atmospheres.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
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Based on what you have learned why do think you are told not to wear black and other colors in warm weather?
Answer: dark clothes have trouble reflecting the sun's rays
Explanation:
Because of that, the dark-colored clothing traps the heat from the sun. This then makes you feel much hotter.
How many oxygen atoms are present in one mole of serotonin?
C10H12N2O
A. 7.2×10²⁴ B. 1.2×10²⁴ C. 6.02×10²³ D. 6.02×10²⁴
The number of oxygen atoms present in one mole of serotonin would be 6.02×10²³ atoms.
Number of atoms in moles of substancesSerotonin goes by the chemical formula C10H12N2O. This means that 1 mole of serotonin contains 10 moles of carbon 12 moles of hydrogen, 2 moles of nitrogen, and a mole of oxygen.
According to Avogadro, 1 mole of any substance contains 6.02×10²³ atoms of the substance.
In other words, 1 mole of oxygen atom will contain 6.02×10²³ atoms of oxygen.
This means that 1 mole of serotonin will contain 6.02×10²³ atoms of oxygen.
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Answer:
B 1.2x10^24
Explanation:
Determine whether each of the following compounds is likely to exist as a molecule, or as an ionic compound:
Hydrogen fluoride; HF
Silicon tetrachloride; SiCl4
Elemental sulfur as S8
Disodium dioxide; Na2O
PF3
Be3N2
AlP
CBr4
We determine the probability that each of the following compounds exists as a molecule or as an ionic compound:
Hydrogen fluoride (HF) is a polar covalent molecule that exists as a gas at room temperature. Silicon tetrachloride (SiCl4) is an ionic compound, as the silicon atom is bonded to four chlorine atoms by electrostatic attraction. Elemental sulfur (S8) exists as a molecule with a ring-like structure. Disodium dioxide (Na2O) is an ionic compound, as the sodium atoms are bonded to an oxygen atom by electrostatic attraction. Phosphorus trifluoride (PF3) is a polar covalent molecule, as the phosphorus atom is bonded to three fluorine atoms by covalent bonds. Beryllium nitride (Be3N2) is an ionic compound, as the beryllium atom is bonded to two nitrogen atoms by electrostatic attraction. Aluminum phosphide (AlP) is an ionic compound, as the aluminum atom is bonded to a phosphorus atom by electrostatic attraction. Carbon tetrachloride (CBr4) is a polar covalent molecule, as the carbon atom is bonded to four chlorine atoms by covalent bonds.
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which of the following compounds is the stronger acid? an acid with a pka of 13.5 an acid with a pka of 13
An acid with a pKa value of 13 is the stronger acid. This is because the lower the pKa value, the stronger the acid is.
The strength of an acid is determined by its dissociation constant (Ka) or the negative logarithm of the dissociation constant (pKa). The lower the pKa value, the stronger the acid. A higher dissociation constant indicates a stronger acid, as the acid will dissociate more readily in solution and release more hydrogen ions. The dissociation constant can be used to calculate the pH of a solution, which is a measure of the concentration of hydrogen ions in the solution.
Therefore, an acid with a pKa of 13.5 is a weaker acid than an acid with a pKa of 13, as the latter has a lower pKa value. This means that the acid with a pKa of 13 will dissociate more readily in solution and release more hydrogen ions, making it the stronger acid.
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Solubility is determined by: Select the correct answer below: O solute-solute forces O solvent-solvent forces O solute-solvent forces O all of the above
Solvent-solvent forces, solute-solvent forces, and solute-solvent forces all play a role in determining solubility. As a result, the best choice is all of the above.
How is solubility determined?A substance's solubility is the greatest amount of a solute that can dissolve in a specific amount of solvent; it is influenced by the chemical makeup of the solvent and the solute as well as by temperature and pressure.
How is a solute determined to be soluble in a solvent?Generally speaking, polar solutes dissolve best in polar solvents, and nonpolar solutes dissolve best in nonpolar solvents, which are closest in molecular structure. Additionally, solutes will be easier to dissolve if their molecules are smaller than those of the solvent.
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convert 4.5cm^3 to mL
a scrubber on a coal-fired power plant is useful to remove which of the following? sulfur dioxide carbon dioxide particulate matter i only ii only iii only i and iii only
sulfur dioxide. The scrubber is an apparatus installed in a coal-fired power plant to clean the passing gas through the smokestack.
Why do people use sulfur scrubbing?In order to lessen acid rain, there are additional methods in use that really can extract sulfur dioxide in waste gases.These procedures, known as "sulfur scrubbing," can remove and over 95% of the sulfur dioxide present in waste gases.
How may sulfur emissions from coal-fired power plants be reduced?Utilizing less sulfuric coal is one option.The coal can also be "washed" to get some of the sulphur out.Scrubbers are a piece of machinery that the power plant can add to remove sulfur dioxide from waste gases the smokestack.
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classify each substance as an element, a compound, a homogeneous mixture, or a heterogeneous mixture.
Iron: Chemical element with the atomic number 26, Water: Compound made up of hydrogen. Saltwater: Solution of salt in water, uniform composition, homogeneous mixture.
Soil: Soil is a mixture of organic and inorganic materials, such as rock fragments, minerals, water, air, and decomposed of dead plants and animals
Iron: Iron (Fe) is a chemical element with the atomic number 26. It is an element because it cannot be broken down into simpler substances by chemical means.
Water: Water is a chemical compound with the chemical formula H2O.
Saltwater: Saltwater is a solution of salt (NaCl) in water. In a saltwater solution, the salt is evenly dispersed in the water and the composition is uniform throughout the solution.
Soil: Soil is a mixture of organic and inorganic materials, such as rock fragments, minerals, water, air, and decomposed of dead plants and animals. Soil is a heterogeneous mixture because it contains different substances that are not evenly distributed and can be physically separted.
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how many valence electrons does the following element have? 1s22s22p63s23p63d104s24p65s24d105p4 group of answer choices 4 6 10 14
part a - which kinds of chemicals were found to be produced in the flasks at the conclusion of the miller-urey experiment?
The kinds of chemicals found to be produced in the flasks at the conclusion of the Miller-Urey experiment are wаter ([tex]H_{2}O[/tex]), methаne ([tex]CH_{4}[/tex]), аmmoniа ([tex]NH_{3}[/tex]) аnd hydrogen ([tex]H_{2}[/tex]).
The Miller-Urey experiment (or Urey-Miller experiment) wаs аn experiment thаt simulаted hypotheticаl conditions present on the eаrly Eаrth аnd tested for the occurrence of chemicаl evolution. The experiment used wаter ([tex]H_{2}O[/tex]), methаne ([tex]CH_{4}[/tex]), аmmoniа ([tex]NH_{3}[/tex]) аnd hydrogen ([tex]H_{2}[/tex]). The chemicаls were аll seаled inside а sterile аrrаy of glаss tubes аnd flаsks connected together in а loop, with one flаsk hаlf-full of liquid wаter аnd аnother flаsk contаining а pаir of electrodes. The liquid wаter wаs heаted to induce evаporаtion, spаrks were fired between the electrodes to simulаte lightning through the аtmosphere аnd wаter vаpor, аnd then the аtmosphere wаs cooled аgаin so thаt the wаter could condense аnd trickle bаck into the first flаsk in а continuous cycle.
Your question is incomplete, but most probably your options were
A. methane, ammonia, and hydrogen
B. amino acids and carbohydrates
C. amino acids, carbohydrates, and nucleic acids
D. carbohydrates and nucleic acids
Thus, the correct option is A.
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true/false. the internet of things (iot) is a network of physical objects embedded with sensors, software, and other technologies for connecting and exchanging data with other devices and systems via the internet. these gadgets range from common household items to sophisticated industrial tools. the reason for this attraction is the numerous capabilities made possible by this technology.
The Web of Things (IoT) is the term used to refer Software to a network of physical devices, or "things," that are connected to one another and share data.
Software definition and examples?In this usage, "software" refers to the running scripts, programs, and apps on a device. It can be likened to the variable part of a computer, meanwhile the hardware is the part that will never change. The two primary classifications of software are application and system software
What are the two types of software?Computer software is typically separated into two primary categories: application software and system software. Programs that control the resources of the computer system and simplify application programming are included in systems software.
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given 2.04 moles of Al, how many grams of sulfur are required?Please look at screenshot.
As per the given balanced chemical equation of the reaction between aluminum and sulfur, 2 moles of Al needs 3 moles of sulfur. Then, 2.04 moles of Al requires 3.06 moles of S.
What is aluminum sulphide ?Aluminum sulphide, Al₂S₃ is an ionic compound formed by donation of electrons from Al metal to S atoms. The balanced chemical equation of their reaction is given here.
It is clear that, 2 moles of aluminum requires 3 moles of sulfur for complete reaction. Hence, the number of moles of sulfur needed to react with 2.04 moles of Al is calculated as follows:
Number of moles of S = (2.04 ×3 ) / 2 = 3.06.
Therefore, as per the given equation, 3.06 moles of sulfur is required to react with 2.04 moles of aluminum.
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an automobile gasoline tank holds 40kg of gasoline. when gasoline burns, 140 of oxygen is consumed and carbon dioxide and water are produced. whats the total mass of carbon dioxide and water produced
40 + 140 = 180 kg of water and carbon dioxide were created in total when gasoline burns.
How much fuel can a tank in a car hold?An average gasoline tank holds 13 to 16 gallons. For instance, the fuel capacity of a Ford Focus is 13.5 gallons, that of an Elantra is 14, and that of a Mazda 3 ranges from 14.9 to 15.9 gallons, depending on the model.
Mass of gasoline plus mass of oxygen equals the combined mass of carbon dioxide and water produced.
combined mass of the water and carbon dioxide produced = 40 + 140 = 180 kg The chemical reaction will appear as follows:
the following equation: fuel + oxygen + carbon dioxide + water + heat
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The weak acid HZ has a K, of 2.55 x 10-4. Calculate the pH of 0.045 M HZ
The pH of the the solution is the negative logarithm of its H+ ion concentration. Here, the H+ concentration is 0.00338 M. Then The pH of the solution is 2.4.
What is pH ?pH of a solution is the measure of its acidity or basicity. It measures the concentration of H+ or hydronium ion in the solution. It is the negative logarithm of the H+ ion concentration of the solution.
pH = -log [H+]
Given that, k = 2.55 × 10⁻⁴M.
[HZ] = 0.045 M.
k = [H+] [Z-]/[HZ]
Here the solution gives equal number of H+ ions and Z- ions. Hence, [H+] = [Z-]
[H+]² = [HZ] k = 0.045 M ×2.55 × 10⁻⁴M
[H+] = 0.00338 M.
pH = - log (0.00338 ) = 2.4
Therefore, the pH of the solution is 2.4.
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The chemical para–dichlorobenzene has been used as insecticide for almost 75 years. It has the molecular formula C6H4Cl2. What is the most accurate value for the percent chlorine, by mass, in para–dichlorobenzene?
Answer:lol
Explanation:
kool
give one permissible set of four quantum numbers for each of the outermost electrons in a single as atom when it is in its ground state.
In quantum mechanics, the state of an electron in an atom is described by four quantum numbers: the principal quantum number (n), the angular momentum quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).
For the outermost electrons in a single arsenic atom in its ground state, one possible set of four quantum numbers would be n=4, l=3, m=-3, s=1/2.
The principal quantum number (n) describes the energy level of the electron, with larger values of n corresponding to higher energy levels. In this example, the electron is in the fourth energy level (n=4).
The angular momentum quantum number (l) describes the shape of the electron's orbital, with values ranging from 0 to n-1. In this example, the electron is in a p orbital (l=3).
The magnetic quantum number (m) describes the orientation of the electron's orbital in space, with values ranging from -l to +l. In this example, the electron's orbital is oriented in the direction of -3 times the z-axis.
The spin quantum number (s) describes the intrinsic angular momentum of the electron, with a value of 1/2. This intrinsic angular momentum is a fundamental property of electrons and is not related to their orbital motion.
This set of quantum numbers describes one of the two electrons in the outermost shell of the arsenic atom in its ground state. Another electron in the same shell could have a different set of quantum numbers, but it would still be subject to the same overall energy and angular momentum constraints.
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Hi please help with AP Chem
The half-life of a reaction is described as the time required for the concentration of the reactant to decrease to one-half of its initial value.
The relationship between the concentration of A and the half-life can be shown as:
t1/2 = k / 2.303 / [A]
The reaction is first order, so the rate constant can be shown as:
k = k' * e^(-Ea/RT)
t1/2 = (1 / 0.0387 M s^-1) * 2.303 / 0.333 M = 62.12 s
Therefore, the half-life of the reaction is 62.12 s at 400°C.
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when comparing ethanol, c h 3 c h 2 o h , and sodium ethoxide, n a o c h 2 c h 3 , sodium ethoxide is the better nucleophile because it _________.
when comparing ethanol, CH CH, OH, and sodium ethoxide, NaOCH, CH3, sodium ethoxide is the better nucleophile because it has a negative charge.
In chemistry, a nucleophile is a chemical species that form bonds with the aid of donating an electron pair. All molecules and ions with a loose pair of electrons or at least one pi bond can act as nucleophiles. due to the fact nucleophiles donate electrons, they're Lewis bases.
Nucleophilic describes the affinity of a nucleophile to bond with definitely charged atomic nuclei. Nucleophilicity, on occasion known as nucleophile strength, refers to a substance's nucleophilic person and is often used to compare the affinity of atoms. Neutral nucleophilic reactions with solvents consisting of alcohols and water are named solvolysis. Nucleophiles might also participate in nucleophilic substitution, wherein a nucleophile will become attracted to a full or partial high-quality charge and nucleophilic addition. Nucleophilicity is intently associated with basicity.
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An average copper penny minted in the 1960s contained about 3.000g of Copper. How much chalcopyrite had to be mined to produce 100 pennies?
An average copper penny minted in the 1960s contained about 3.000g of Copper. 866.49 g chalcopyrite had to be mined to produce 100 pennies.
What is mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
1 mole is equal to 6.023 × 10 ²³ molecules.
Given:
Copper used = 100 pennies x 3.0g Cu per penny
= 300.0 g Cu
Then, identify the pathway and molar ratio from Cu formed back to CuFeS₂ required using the balanced reactions:
1 Cu₂S from 2 CuS : 2Cu from 1 Cu₂S : 2CuS from 2CuFeS₂
Therefore, 2Cu from 2CuFeS₂, they are in same molar ratio.
Now, convert g Cu to moles and g of CuFeS₂
= 300.0 g Cu × 1 mol Cu / 63.546g Cu × 2 mol CuFeS₂ / 2 moles Cu
= 4.72 moles CuFeS₂
The chalcopyrite had to be mined to produce 4.72 moles CuFeS₂ × 183.54 g CuFeS₂ / 1 mole CuFeS₂
= 866.49 g CuFeS₂
Thus,866.49 g chalcopyrite had to be mined to produce 100 pennies.
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