Potassium dihydrogen arsenate has a more stable excited state than potassium nitrate, so the emitted light is dimmer.
Potassium nitrate (KNO3) is an ionic white crystalline salt made up of potassium ions and nitrate ions. It is also known as saltpeter or nitre. Manufacturing fertilizers, pesticides, glass, fireworks, explosives, and rocket fuel are among the uses of potassium nitrate. When added to meat, it triggers a reaction between the myoglobin and hemoglobin in the blood, giving the meat its red color. It is also used as a food preservative. Additionally, some toothpastes use it as an additive to lessen tooth sensitivity. When it comes to human consumption, potassium nitrate use is strictly regulated because it is toxic at high doses.
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assume the reaction produces 0.0032 moles of h2 gas with a volume of 0.0806 l, pressure of the dry h2 of 0.9720 atm and temperature of 297.2 k. calculate the ideal gas constant, r in units of (l atm/(mol k)).
The ideal gas constant, r, has a unit of (l atm/mol k) of 0.0821 l atm/ mol k.
The formula for the ideal gas constant is
PV = nRT
P = pressure
V=volume
n= number of moles,
R=ideal gas constant, and
T=kelvin temperature.
When all the values are entered into the formula, we get:
[tex]R= \frac{PV}{nT} \\R=\frac{ 0.9720* 0.0806}{0.0032*297.2}[/tex]
[tex]R= \frac{0.0783}{0.9510}[/tex]
[tex]R= 0.0821[/tex]
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In the structure illustrating the bonding in ethene, c2h4, the two arrows point to what type of bond or bonds?.
The straight arrows in the structure c2h4 that represent binding bonding in ethene point to the bond.
What do you mean bond?Bond are fixed-income products that reflect loans from investors to borrowers . An bond can be compared to the an agreement outlining the terms of the loan and the associated payments between both the lender and borrower.
What is bond in relationship?A strong sense of friendship, affection, or shared values which brings people together is referred to as a bond. We developed a very unique friendship as a result of the event. The tie that bound them was [+ between]. Synonyms include bind, link, tie, and union. Additional words for bond.
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For SN1 solvolysis of t-butyl chloride, rank the solvents from fastest reaction to slowest reaction.acetone, ethanol, methanol, water, formic acid, and acetic acid
For SN1 solvolysis of t-butyl chloride, the solvents from the fastest reaction will be water and the slowest reaction will be Acetic acid
The SN1 reaction is a substitution reaction in organic chemistry. The Hughes-Ingold symbol, which depicts how the reaction occurs, gave rise to its name. The letters "SN" stand for "nucleophilic substitution," and the number "1" denotes that the rate-determining step is unimolecular.
A chemical reaction known as solvolysis occurs when a solvent, such as water or alcohol, is used in excess and functions as one of the reagents. As a result, water, formic acid, methanol, and ethanol are the fastest.
Yes, solvolysis can continue the SN1 reaction. A nucleophilic substitution reaction with a unimolecular rate-determining step is known as the SN1 reaction. Carbocation-containing intermediates are produced during SN1 reactions.
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if 8.00 moles of nh₃ of and 10.00 moles of o₂ react in the following reaction, how many moles of which reactant will be left over? 4 nh₃ (g) 5 o₂ (g) → 4 no (g) 6 h₂o (g)
8 mol NH3 X (5 mol O2 / 4 mol NH3) = 10 mol O2The stoichiometric ratio of the two reactants is used to mix them. If the reaction is successful, neither reactant will be left behind.
How are product moles determined?Knowing a product's mass and molar mass—the mass of one mole of the product—is necessary to compute the moles of a given substance. After that, you divide the product's mass by its molar mass.
Molar mass of NaOH = (23.0 + 16.0 + 1.0) g/mol = 40.0 g/mol
Molar mass of Ni(OH)₂ = (58.7 + 16.0×2 + 1.0×2) g/mol = 92.7 g/mol
Initial no. of moles of NaOH = (31.0 g) / (40.0 g/mol) = 0.775 mol
Initial no. of moles of Ni(NO₃)₂ = (1.00 mol/L) × (0.550 L) = 0.550 mol
Balanced equation for the reaction:
2NaOH(aq) + Ni(NO₃)₂(aq) → Ni(OH)₂(s) + 2NaNO₃(aq)
Mole ratio NaOH : Ni(NO₃)₂ : Ni(OH)₂ = 2 : 1 : 1
If NaOH completely reacts, Ni(NO₃)₂ needed = (0.775 mol) × (1/2) = 0.3875 mol < 0.550 mol
Hence, Ni(NO₃)₂ is in excess, and NaOH is the limiting reactant.
No. of moles of NaOH reacted = 0.775 mol
No. of moles of Ni(OH)₂ formed = (0.775 mol) × (1/2) = 0.3875 mol
Mass of Ni(OH)₂ formed = (0.3875 mol) × (92.7 g/mol) = 35.9 g
Which of the reactants can you identify?In a chemical equation, the substance or substances to the left of the arrow are referred to as reactants. A substance that is present when a chemical reaction first begins is known as a reactant. Products refer to the material or substances to the right of the arrow.
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The Calvin cycle is aMultiple Choicelinear pathway that produces ATP and NADPH.cyclic pathway that produces three-carbon carbohydrates from CO2.cyclic pathway that produces ATP and NADPH.linear pathway that produces three-carbon carbohydrates from CO2.cyclic pathway that produces ATP and three-carbon carbohydrates from CO2.
The Calvin cycle is a cyclic pathway that produces three-carbon carbohydrates from CO2.
The Calvin cycle, also known as the light-independent reactions cycle, the bio synthetic phase, the dark reactions cycle, or the photosynthetic carbon reduction cycle, is a series of chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose.
The Calvin cycle reactions are divided into three major stages: carbon fixation, reduction, and molecule regeneration. The Calvin cycle is also known as the C3 cycle because the first stable compound in the cycle is a three carbon compound (3 phosphoglyceric acid). Calvin's cycle reactions occur in three stages.
Some Calvin cycle reactions necessitate the use of ATP (adenosine triphosphate), an energy transfer compound, and NADPH (reduced nicotinamide adenine dinucleotide phosphate), a source of hydrogen atoms for reduction reactions. ATP and NADPH are produced during photosynthesis's light-activated reactions.
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wine goes bad soon after opening because the ethanol dissolved in it reacts with oxygen gas to form water and aqueous acetic acid , the main ingredient in vinegar. calculate the moles of acetic acid produced by the reaction of 2.40 of ethanol. be sure your answer has a unit symbol, if necessary, and round it to significant digits.
0.04 mol is the moles of acetic acid produced by the reaction of 2.40 of ethanol.
CH3CH2OH + O2 → H2O + CH3COOH
molar mass, oxygen = 15.999 g/mol
molar mass,carbon = 12.011 g/mol
molar mass, hydrogen = 1.008 g/mol
molar mass of CH3COOH = [ (12.011 x 2) + (1.008 x 4) + (15.999 x 2) ] = 60.052 g/mol
moles= given mass/molecular mass
moles=2.40/60= 0.04 mol
The mole concept is a helpful way to quantify the amount of a substance. When dealing with particles at the atomic (or molecular) level, it is known that even one gram of a pure element contains an enormous number of atoms. The mole concept is frequently used in this context. The most popular unit of measurement is the "mole," which is a count of a significant number of particles.
The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". Among the elementary entities that can be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).
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what is the mole fraction of water in a solution that has 1.0 mole of sugar (342.3 g/mol) dissolved in 0.45 l of water (450 g; about 25 moles)?
The Mole Fraction of water in a solution is 0.961.
The Mole Fraction is the product of the molecular weight of one component divided by the molecular weight of the entire mixture. When two components with reactive natures are combined, it is quite helpful. The mole fraction is the ratio of the two elements.All of the mole fractions that are present in the given mixture add up to one.XA + XB = 1.The mole percentage is produced by multiplying the mole fractions by 100.The expression "mole fraction" has no units or dimensions.[tex]Mole=\frac{H2O}{Sugar+H2O}[/tex]Mole= 25/1 +25=0.961
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what would the relative rate from slowest to fastest of the solvolysis reaction be if these compounds in methanol-acetone
Typically, If these chemicals were present in methanol-acetone, the solvolysis process would proceed at the quickest to slowest relative rate. solvolytic reactions involve the replacement of one atom or group of atoms.
The solvents operate as or produce nucleophiles (atoms or groups of atoms with plenty of electrons), which displace an atom or group in the substrate molecule. The pace of solvolysis may be defined in terms of how easy carbocation formation. The carbocation in structure (I) that solvolysis results from methanol-acetonethe elimination of Br is an antiaromatic molecule, and it will be the least stable. When Br is removed from structure (II), a carbocation of methanol-acetonethe that results is an aromatic compound.
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with regards to the run-mode clock configuration 2(rcc2) register, what hex value would need to be in bit field 6:4 (in other words, bits 6 and 4 in that order) in order for the microcontroller to use the main oscillator as the oscillator source? (refer to the tm4c123 datasheet, ch 5). give your answer in hexadecimal.
In order for the microcontroller to use the main oscillator as the oscillator source is 0x1
What is an oscillator?
A chemical oscillator is a mixture of chemical compounds that are interacting and whose concentration of one or more components changes on a regular basis. They belong to a group of processes that exhibit far from equilibrium non-equilibrium thermodynamics.
what is an configuration ?
A configuration is typically the arrangement of the elements that make up a whole, or the act of doing so.
Therefore, in order for the microcontroller to use the main oscillator as the oscillator source is 0x1
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a student prepared a graph of the results from an experiment where no(g) was added in small increments to a measuring tube containing oxygen gas. the student plotted the total volume of gas in the measuring tube as the dependent variable on the y axis and the total volume of no(g) as the independent variable along the x axis. all volumes were measured and plotted in milliliters of the respective gas. the plot shows a linear trend with a negative slope. select the statement that gives the best interpretation of the negative slope observed in this experiment.
As NO(g) is added the volume of NO(g) is increasing.
As NO(g) is added the volume of oxygen in the measuring tube is decreasing.
The volume of NO(g) is increasing.
The volume of oxygen in the measuring tube is decreasing.
As NO(g) is added the volume of oxygen in the measuring tube is decreasing. gives the best interpretation of the negative slope observed in this experiment.
The energy-producing chemical process known as respiration, which powers the metabolisms of most living organisms, depends heavily on oxygen. Many other organisms, including humans, depend on the oxygen in the air we breathe to maintain life.
Nitrogen is oxidized to produce the colorless, poisonous gas known as nitric oxide (NO), sometimes known as nitrogen monoxide. In both humans and other animals, nitric oxide (NO)is a key chemical signaling agent that also has a number of medical uses. It only has a few industrial uses.
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nitric acid (63 g) and sodium hydroxide (60 g) are mixed. determine how many grams of water will form.
17.99 g of water will formed when nitric acid (63 g) and sodium hydroxide (60 g) are mixed.
When nitric acid and sodium hydroxide are mixed, a neutralisation reaction takes place, with the salt created by the two substances and water serving as the reaction result. The rational response to the statement in this instance is:
Na(OH) + HNO3 ⇒ NaNO3 + H2O
• The formula for HNO3's molar mass is 3xmO + mH + mN, or 3x15.99g + 1g + 14g = 62.97 g/mol.
• The formula for NaOH molar mass is: mO + mH + mNa = 15.99g + 1.00g + 22.99g = 39.98 g / mol.
18g of water and 63g of HNO3
17.99 g of water from 62.97 g of HNO3
62.97 g divided by 18 g and 63 g equals 17.99 g of water.
As a result, 17.99 g of water will form.
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write the chemical reactions whose equilibrium constants are Kb and Ka for imidazole (c3h4n2) and imidazole hydrochloride (c3h4n2h cl−) , respectively.
The chemical reactions and their equilibrium constants for imidazole and imidazole hydrochloride are given below.
A chemical reaction is a process in which chemical bonds between atoms and molecules are broken and formed, resulting in the formation of new substances with distinct chemical properties.
Imidazole ([tex]\rm C_3H_4N_2[/tex]) is a weak base and can react with water to form the imidazole ion and hydronium ion. The equation for this reaction is:
[tex]\rm C_3H_4N_2 + H_2O \rightleftharpoons C_3H_4N_2H^+ + OH^-[/tex]
The equilibrium constant for this reaction is called the base dissociation constant ([tex]\rm K_b[/tex]) of imidazole.
[tex]\rm K_b = \dfrac { [C_3H_4N_2H^+][OH^-]} {[C_3H_4N_2]}[/tex]
Imidazole hydrochloride ([tex]\rm C_3H_4N_2HCl[/tex]) is a weak acid and can react with water to form the imidazole ion and hydronium ion. The equation for this reaction is:
[tex]\rm C_3H_4N_2HCl + H_2O \rightleftharpoons C_3H_4N_2H^+ + Cl^- + H_2O[/tex]
The equilibrium constant for this reaction is called the acid dissociation constant ([tex]\rm K_a[/tex]) of imidazole hydrochloride.
[tex]\rm K_a = \dfrac {[C_3H_4N_2H^+][Cl^-] }{ [C_3H_4N_2HCl]}[/tex]
Therefore, the chemical reactions with their equilibrium constants for the given compound's imidazole and imidazole hydrochloride in aqueous solution are mentioned above.
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draw the electron dot formula for silicon disulfide, sis2. how many nonbonding electron pairs are in a silicon disulfide molecule?
For SiS₂, silicon disulfide, the electron dot formula could be seen in the attached picture. The total nonbonding electron pairs in a SiS₂ molecule is: 4 pairs.
What are the Lewis structure and nonbonding electron?
The electron dot formula, also known as the Lewis structure, is a representation of the total valence electrons of atoms within a molecule. By writing an electron dot formula, we can visualize the existence of valence electrons and whether they are within bonds or just stand as lone pairs.
The nonbonding electron or the lone pairs are electrons within an atom that are not forming a bond with the other atoms in a molecule. In the SiS₂ molecules, the 4 nonbonding pairs exist both in S atoms.
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for each burned food sample, it is important to get a mass before and after the burning takes place. what would happen to the calculated energy (compared to the actual energy) per gram released if a student does notget a mass after the sample is burned?
So the mass of the product equals the mass of the reactant, The material has holes in it so it is actually lighter in mass than it appears.
Mass of reactants equals mass of products. By inserting the word "moles" between each coefficient and formula, this equation can be read in "moles." A ratio of the moles for any two substances in an equation is known as a mole-mole factor. Acc0rding to the law of conservation of mass, the total mass of reactants and products in a chemical reaction is eq.ual. For instance, the mass of the finished substance, sodium chloride, is equal to the mass of sodium plus the mass of chlorine that reacts with the sodium. Additionally, in a chemical equation, the number of atoms of different elements on the reactants side equals the number of atoms on the products side.
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bombardment of uranium-238 with a deuteron (hydrogen-2) generates neptunium-237 and neutrons. write out the reaction.
Bombardment of uranium-238 with a deuteron (hydrogen-2) generates neptunium-237 and 3 neutrons.
Uranium-238 + 1H3 = Neptunium-237 + 3 neutrons
The process of nuclear fission involves the splitting of an atom's nucleus into two or more smaller nuclei. Even by the energetic standards of radioactive decay, the fission process releases a very high quantity of energy and frequently results in gamma photons.
Uranium-238 is converted into Uranium-239 by neutron capture, which then undergoes a quick conversion to Neptunium-239 by beta radiation. After about three days, beta radiation changes this neptunium into a new nucleus called plutonium-239. Like uranium-235, this radionuclide is fissile.
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what is the volume of 3.5 mol of an ideal gas at a pressure of 3 atm and a temperature of 0 ◦ c? 1 liter
The volume of 3.5 mol of an ideal gas at a pressure of 3 atm and at temperature of 0°C is 26.227 L
The volume of the ideal gas can be solved using the ideal gas equation of state:
PV=nRT
Where
p is the gas pressure
V is its volume
n is the number of moles
R is the gas constant
T is the absolute temperature of the gas
For the ideal gas of this problem:
n = 3.5 mol (number of moles)
p = 3 atmospheres (pressure)
T = 0°C= 0+273°K =273 °K
R= the gas constant = 0.082Latm/mol °K
Solving for V gives the volume of the gas.
V= nRT
P
V = 3.5 mol x 0.082Latm/mol °K x 273 °K
3 atm
V = 26.227 L
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Determine the velocity of a medicine ball (m = 10.0 kg) with a wavelength of 1.33 × 10-35 m.
The velocity of a medicine ball is 1.33 × 10-35 m/s².
What is wavelength?This refers to the space between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated win area or along a wire.
Wave is characterized by frequency, wavelength, amplitude, and velocity. When the frequency is constant the wavelength is directly proportional to velocity.
Hence,
Velocity, V ∝ wavelength, λ
From the Question:Mass,m = 10.0 kg
the wavelength, λ =1.33 × 10-35 m.
Thus,
Assuming constant frequency,
Velocity, V ∝ wavelength, λ
velocity, V= 1.33 × 10-35 m/s²
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in a mixture of 1.90 mol of gas, 0.85 mol are nitrogen (n2) molecules. what is the mole fraction of n2 in this mixture?
0.447 is the mole fraction of Nitrogen in this mixture.
mole fraction of nitrogen= moles of nitrogen/total moles
mole fraction of nitrogen=0.85/1.90
mole fraction of nitrogen=0.447
The product of the moles of a component and the total moles of the solution yields a mole fraction, which is a unit of concentration measurement. Because it is a ratio, mole fraction is a unitless statement. The sum of the components of the mole fraction of a solution is one. In a mixture of 1 mol benzene, 2 mol carbon tetrachloride, and 7 mol acetone, the mole fraction of the acetone is 0.7. This is computed by dividing the sum of the moles of acetone in the solution by the total number of moles of the solution's constituents:
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a tube containing a 1:80 dilution of serum is accidentally dropped. a 1:4 dilution of the specimen is still available. a volume of 4 ml is needed to run the test. how much of the 1:4 dilution is needed to make 4 ml of a 1:80 dilution?
0.2ml is required as 1 : 4 dilution to make 4ml of 1 : 80 dilution.
What is dilution and concentration?
Dilution is the addition of solvent, which decreases the concentration of the solute in the solution.
Concentration on the other hand, is the removal of solvent, which increases the concentration of the solute in the solution.
Calculation:The volume of solution needed to make the solution can be calculated by the formula,
V1 x N1 = V2 x N2
4 ml of 1:80 diluted solution has to be made from 1:4 solution.
Applying these values in the above formula,
V1 x (1/4) = 4 x (1/80)
V1/4 = 1/20
V1 = 4/20
V1 = 0.2 ml
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At top speed, cheetahs can run 80 miles per hour. How fast would that be in meters/second?
Answer: 35.7632
Explanation:
which type of chemical reaction represents the most energetically favorable step in the citric acid cycle?
Steps 3, 4, 6 and 8 are the energetically favoured steps in a citric acid cycle, and in these steps, decarboxylation and Oxidative dehydrogenation reactions are taking place.
What is the Citric acid cycle?
The citric acid cycle, often referred to as the Krebs cycle or the TCA cycle is a sequence of chemical reactions that oxidize acetyl-CoA, which is obtained from carbs, lipids, and proteins, to release stored energy. Organisms that respire (as opposed to organisms that ferment) use the Krebs cycle to produce energy, either through anaerobic or aerobic respiration. The cycle additionally supplies the reducing agent NADH and precursors of a few amino acids that are needed in a variety of other processes.
What is Oxidative decarboxylation?
In the process of oxidative decarboxylation, a carbon group is removed as a result of oxidation processes, producing carbon dioxide. Many biological activities, like the citric acid cycle, depend on them. It is used three times in the citric acid cycle to produce CO2 and convert NAD+ to NADH. First, pyruvate is transformed into acetyl CoA by a complex of pyruvate dehydrogenases. The enzyme Isocitrate dehydrogenase is then used to convert isocitrate to ketoglutarate, and ketoglutarate dehydrogenase is then used to convert ketoglutarate to succinyl CoA.
Hence, in a citric acid cycle, the chemical reactions which are energetically favoured are oxidative decarboxylation and dehydrogenation.
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Which reagent must the solution of sodium chloride be treated with in order to determine the amount of sodium chloride using gravimetric precipitation analysis?
potassium nitrate
lead nitrate
ammonium nitrate
calcium nitrate
As a precipitating agent, potassium nitrate is utilized. Precipitation The analytical technique of gravimetry uses a precipitation process to separate ions from a solution. The chemical that is utilized to produce is precipitating agent.
The required element is converted into a substance (of known composition) using the precipitation quantitative chemical analysis method known as gravimetric analysis so that it may be removed from the sample and weighed. The following steps are commonly involved in gravimetric precipitation analysis:
(1) making a solution with an established sample weight;
(2) removing the wanted component;
(3) measuring the separated component's weight;
(4) using the observed weight of the separated material to calculate the quantity of the specified ingredient in the sample.
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write the formula for these compounds containing polyatomic ions. a) chromium 3 nitrite b) sodium perchlorate c) magnesium hydrogen carbonate d) calcium acetate
The chemical formula of the given compounds are :
a) chromium 3 nitrite : [tex]Cr(NO_{2} )_{3}[/tex]
b)sodium perchlorate: [tex]NaClO_{4}[/tex]
c) magnesium hydrogen carbonate : [tex]Mg(HCO_{3} )_{2}[/tex]
d) calcium acetate: C₄H₆CaO₄
A chemical formula is a way to communicate information in chemistry about the proportions of atoms that make up a specific chemical compound or molecule. Chemical element symbols, numbers, and occasionally other symbols like parentheses, dashes, brackets, commas, and plus and minus signs are used to represent the chemical elements.
A chemical formula is a phrase that lists the constituent parts of a compound together with their relative proportions. No subscript is used if there is just one atom of a certain kind. A subscript is added to the symbol for an atom if it contains two or more of a certain type of atom.
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Classify each substance as a strong electrolyte, weak electrolyte, or nonelectrolyte:
(a) Sodium permanganate (b) Acetic acid (c) Methanol (d) Calcium acetate
The substance is classified as a strong electrolyte, weak electrolyte, or nonelectrolyte, as follows:
Sodium permanganate (NaMnO₄) is strong electrolytesAcetic acid (CH₃COOH) is weak electrolytes,Methanol (CH₃OH) is nonelectrolytesCalcium acetate [Ca(C₂H₃O₂)₂] is strong electrolytesTherefore, sodium permanganate (NaMnO₄) is strong electrolytes, acetic acid (CH₃COOH) is weak electrolytes, methanol (CH₃OH) is nonelectrolytes while calcium acetate [Ca(C₂H₃O₂)₂] is strong electrolytes
An electrolyte is a substance that chemically changes when an electric current is passed through it.
Strong electrolytes are electrolytes that are almost completely soluble in water. when Sodium permanganate dissolved in water The random movement of the potassium permanganate particles causes a dark purple solution to appear in the water at the bottom of the beaker. The purple solution gradually diffuses into the rest of the water in the beaker, resulting in a less thick but same-colored purple solution.
Weak electrolytes are electrolytes that are completely insoluble in water.
A non-electrolyte is a substance that does not conduct electric current in aqueous solution or in the molten state.
therefore, the strong electrolyte are Sodium permanganate (NaMnO₄) and Calcium acetate [Ca(C₂H₃O₂)₂], nonelectrolytes is Methanol (CH₃OH) while Acetic acid (CH₃COOH) is weak electrolytes.
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What happens to the chemistry of the seawater as more co2 is absorbed into the oceans?.
The pH decreases and the ocean becomes more acidic as more co2 is absorbed into oceans.
Because of human-driven increased levels of carbon dioxide in the atmosphere, there is more CO2 dissolving into the ocean. The ocean's average pH is now around 8.1, which is basic (or alkaline), but as the ocean continues to absorb more CO2, the pH decreases and the ocean becomes more acidic.
What happens when co2 is absorbed in seawater?
Ocean acidification occurs when carbon dioxide (CO2) is absorbed rapidly into the ocean. It reacts with water molecules (H2O) to form carbonic acid (H2CO3). This compound then breaks down into a hydrogen ion (H+) and bicarbonate (HCO3-). These hydrogen ions decrease seawater pH.
What happens if there is more carbon in the ocean?
Excess carbon in the atmosphere warms the planet and helps plants on land grow more. Excess carbon in the ocean makes the water more acidic, putting marine life in danger.
What is ocean acidification?
As Carbon dioxide in the atmosphere increases, it sinks into the ocean and dissolves in water creating carbonic acid which is bad for marine organisms. the PH decreased in the ocean and the ocean water becomes more acidic.
Thus, oceans become more acidic.
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how many liters of hydrogen gas with an excess of nitrogen at stp are required to prepare 45.0 g of ammonia?
The volume of H₂ gas required with an excess of nitrogen at STP to prepare 45.0 g of ammonia is 88.7 L.
45 gm ammonia is to be prepared.
The reaction to produce NH₃ is as below-
N₂ ₊ 3H₂ → 2NH₃
First let us calculate the number of moles
number of moles= mass/ molecular mass
number of moles= 45g/ 17 g/mol
number of moles= 2.6 mol
Since 2 moles of NH₃ is produced from 3 moles of H₂.
So, 1 mole of NH₃ will be produced from 1.5 moles of H₂
Hence, 2.6 moles of NH₃ will be produced from 1.5 x 2.6 moles of H₂
So NH₃ produced will be 3.9
Volume = number of moles x 22.4L
Volume= 3.9 x 22.4 L
Volume= 88.7 L
Hence, the volume of H₂ required is 88.7 L.
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beta-carotene is an organic compound with an orange color. the diagram above shows the ultraviolet spectrum of beta-carotene. which of the following statements is true about the absorption bands in the spectrum?
The two main absorption bands in the ultraviolet spectrum of beta-carotene are associated with transitions in electronic energy levels.
This means that when the molecule absorbs energy from ultraviolet light, electrons move from a lower energy level to a higher energy level, resulting in a decrease in absorbance.
The band in the region corresponding to shorter wavelengths:The band in the region corresponding to shorter wavelengths has a lower absorbance than the band in the region corresponding to longer wavelengths because higher energy photons (shorter wavelength light) require more energy to excite the electrons and cause the transition, so less absorbance is observed.
The complete question:Beta-carotene is an organic compound with an orange color. The diagram above shows the ultraviolet spectrum of beta-carotene. Which of the following statements is true about the absorption bands in the spectrum?
The two main absorption bands are associated with transitions in electronic energy levels. The band in the region corresponding to shorter wavelengths shows a lower absorbance than the band in the region corresponding to longer wavelengths.Learn more about the ultraviolet spectrum:
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Arrange the following gases in order of increasing average molecular speed at 25 °c. He, o2, co2, n2.
The increasing order of average molecular speed at 25 °C of the mentioned gases are as follows:
CO₂ < O₂ < N₂ < He
It is known that relation between average molecular speed is directly proportional to its speed and inversely proportional to its molar mass. Average molecular speed depends on its molar mass the lighter the molar mass the faster will be the molecular speed and vice versa.
Molecular speed ∝[tex]\frac{1}{molar mass}[/tex]
Hence,
molar mass of nitrogen= 14 g/mol
Molar mass of helium (He) = 2 g/mol
Molar mass of oxygen = 16 g/mol
Molar mass of carbon dioxide = 44 g/mol
Thus, given gases are arranged in increasing order of average molecular speed at as follows;
CO₂ < O₂ < N₂ < He
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what structural feature seems to distinguish the molecules in which the real bond angle is less than the model bond angle?
Lone pair repulsion seems to distinguish the molecules in which the real bond angle is less than the model bond angle.
What is Lone pair repulsion?
Sometimes referred to as an unshared pair or a non-bonding pair, a lone pair is a pair of valence electrons that are not shared with another atom in a covalent bond. The outermost electron shell of an atom is where lone pairs are discovered.
Therefore, Lone pair repulsion seems to distinguish the molecules in which the real bond angle is less than the model bond angle.
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the Ka of a weak monoprotic acid is 1.80×10−5. what is the ph of a 0.0769 m solution of this acid? ph
The Ka of a weak acid is the acid dissociation constant, which is a measure of the strength of the acid.
The Ka of a weak monoprotic acid is basically 1.80×10−5, which is a very weak acid.
To calculate the pH of a 0.0769 m solution of this acid, we first need to calculate the concentration of the hydrogen ions (H+). So, the Ka expression for a weak acid is:
Ka = [H+][A-] / [HA]
Where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.
As we know the Ka and the concentration of the acid (0.0769 M), we can rearrange the equation to solve for [H+]:
[H+] = Ka * [HA]
[H+] = 1.80 x 10-5 * 0.0769
[H+] = 1.38 x 10-6 M
Now that we have the concentration of hydrogen ions, we can calculate the pH of the solution using the equation:
pH = -log[H+]
pH = -log(1.38 x 10-6)
pH = 5.85
What is a Monoprotic acid?
In a chemical reaction, a monoprotic acid can donate one proton (H+) per molecule. A single hydrogen atom is typically bonded to an oxygen, sulfur, or nitrogen atom in these acids. Hydrochloric acid, acetic acid, and sulfuric acid are all examples of monoprotic acids. When a proton is donated, monoprotic acids can form conjugate bases. These conjugate bases are known as monobasic anions and are frequently used in acid-base equilibrium reactions as conjugate pairs.
What is pH?
The pH of a solution determines its acidity or alkalinity. It is measured on a scale of 0 to 14, with 7 representing neutral. Solutions with a pH less than 7 are considered acidic, while solutions with a pH greater than 7 are considered basic or alkaline. The lower the pH number, the greater the acidity, and the higher the pH number, the greater the alkalinity.
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