Answer:
A.) 4.0
Explanation:
The general equilibrium expression looks like this:
[tex]K = \frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]
In this expression,
-----> K = equilibrium constant
-----> uppercase letters = molarity
-----> lowercase letters = balanced equation coefficients
In this case, the molarity's do not need to be raised to any numbers because the coefficients in the balanced equation are all 1. You can find the constant by plugging the given molarities into the equation and simplifying.
[tex]K = \frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex] <----- Equilibrium expression
[tex]K = \frac{[2 M] [2 M]}{[1 M] [1 M] }[/tex] <----- Insert molarities
[tex]K = \frac{4}{1 }[/tex] <----- Multiply
[tex]K = 4[/tex] <----- Divide
A solution has a hydrogen ion concentration of [H+] = 4.6 x 10 -3 M.
What is the hydroxide ion concentration [OH-] of this solution?
Answer:
[OH⁻] = 2.2 x 10⁻¹²
Explanation:
(Step 1)
Calculate the pH.
pH = -log[H⁺]
pH = -log[4.6 x 10⁻³]
pH = 2.34
(Step 2)
Find the pOH.
pH + pOH = 14
2.34 + pOH = 14
pOH = 11.66
(Step 3)
Calculate the [OH⁻].
[OH⁻] = 10^(-pOH)
[OH-] = 10^(-11.66)
[OH⁻] = 2.2 x 10⁻¹²
If the energy difference between two electronic states is 214.68 kJ / mol , calculate the frequency of light emitted when an electron drops from higher to lower state. Planck's constant , h = 39.79 × 1/10¹⁴ kJ sec per mol .
[tex] {\qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Here we go ~
Energy difference btween the two electronic states can be expressed as :
[tex]{ \qquad \sf \dashrightarrow \: \Delta E = h\nu} [/tex]
[ h = planks constant,[tex]{\: \nu } [/tex]= frequency ]
[tex] \qquad \sf \dashrightarrow \:214.68 = 39.79 \times 10 {}^{ - 14} \times \nu[/tex]
[tex]\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 \times 10 {}^{ - 4} } [/tex]
[tex]\qquad \sf \dashrightarrow \: \nu = \cfrac{214.68}{39.79 } \times 10 {}^{14} [/tex]
[tex]\qquad \sf \dashrightarrow \: \nu \approx 5.395 \times10 {}^{14} \:\:hertz[/tex]
A crystal of potassium permanganate is placed in a beaker of water. The purple colour of potassium permanganate gradually spreads throughout the water by diffusion Explain, using the kinetic particle theory, how this process occurs.
When the crystals of potassium permanganate are preserved in water, the purple-coloured crystals of potassium permanganate break further into smaller particles that populate the distance between the molecules of water imparting a purple colour to the water. This is an example of diffusion.
What are the two conclusions given out in the method of diffusion?
Diffusion is the process of movement of solvent from higher concentration to lower concentration through a semipermeable membrane. So, we can form the decision that it cannot occur through a thick membrane from which small molecules cannot pass through.
What is difference between osmosis and diffusion?Osmosis is the direction of solvent particles from a solution that is diluted to a more concentrated one. In contrast, diffusion is the movement of particles from a higher concentration region to a part of lower concentration.
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Which best explains the effect of chemicals on the environment?
O A. Chemicals are only harmful to the environment.
OB. Chemicals do not affect the environment.
C. Chemicals are only helpful to the environment.
OD. Chemicals can be helpful or harmful to the environment.
The best effect of chemicals on the environment is that Chemicals can be helpful or harmful to the environment.
Environmental chemical compounds seek advice from a chemical compound or chemical element present in air, water, meals, soil, dust, or other environmental media which includes customer merchandise.
Chemical substances can be toxic due to the fact they are able to harm us after they enter or touch the frame. exposure to a poisonous substance together with fuel can have an effect on your fitness. due to the fact that drinking gas can motive burns, vomiting, diarrhea and, in very huge amounts, drowsiness or dying, it's far poisonous.
Nutrient loading from over-fertilization can bring about runoff that causes damaging consequences in aquatic ecosystems. sizable publicity to, or misuse of, insecticides can damage non-centered plants and animal, as well as lead to improvement of pesticide-resistant pest species.
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How much heat is needed to melt 100.0 grams of ice that is already at 0°C?
Group of answer choices
A. +33,400J
B. -226,000 J
C. +226,000 J
D. -33,400J
A. The heat is needed to melt 100.0 grams of ice that is already at 0°C is +33,400 J.
What is Specific heat capacity?Specific heat capacity is the quantity of heat needed to raise the temperature per unit mass.
Heat needed to melt the cube of iceThe heat is needed to melt 100.0 grams of ice that is already at 0°C is calculated as follows;
Q = mL
where;
m is mass of the iceL is latent heat of fusion of ice = 334 J/gQ = 100 x 334
Q = 33,400 J
Thus, the heat is needed to melt 100.0 grams of ice that is already at 0°C is +33,400 J.
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Identify the type of compound that would have the following properties?
Conducts electricity when melted or dissolved in water.
High Melting Point
Usually a Solid
Group of answer choices
A. Ionic
B. Metallic
C. Covalent
D. Molecular
Answer:
The correct answer is A
Explanation:
Ionic compounds conduct electricity when molten (liquid) or in an aqueous solution because their ions are free to move from place to place
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In a perfect world, reactions can never go above 100% yield. However in reality you will sometimes get above 100% yield. Why?
Group of answer choices
A. Excess water and Impurities
B. Impurities Only
C. Excess Water Only
D. You can never have above 100% yield under any circumstance.
Excess water and impurities. Option A.
Under what conditions can one get over a 100% yield?In the actual sense of it, no chemical reaction can give over a 100% yield. The upper limit cannot be breached. Thus, if more than a 100% yield is obtained, there is a problem somewhere.
One of the problems could be that the product is not sufficiently dried. In other words, excess water has contributed to the yield of the reaction.
The second likely problem could be that at some points during the reaction, impurities have been introduced. The weight of the impurities will add to the actual yield and give a bogus over a 100% yield.
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QUESTION 16
What is the product of the following reaction?
+ H₂(g) → ?
Answer:
n2(g)+3h2(g)→2nh3(g) balanced
Explanation:
Wayne Breslyn
The amount of heat transferred from an object depends on
Group of answer choices
A. The initial temperature of the object
B. All of the above
C. The specific heat of the object
D. The mass of the object
The amount of heat transferred from an object depends on the following;
The initial temperature of the object
The specific heat of the object
The mass of the object
Therefore, the answer is all of the above (option B).
What is heat?
Heat is the internal energy of a system in thermodynamic equilibrium due to its temperature.
The amount of heat absorbed or released by an object can be calculated using the following expression:
Q = m × c × ∆T
Where;
Q = quantity of heat
m = mass of object
c = specific heat capacity of object
∆T = change in temperature
Therefore, this suggests that amount of heat transferred from an object depends on the following;
The initial temperature of the object
The specific heat of the object
The mass of the object
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Given the reaction:
N2(g) + 3 H2(g) <--> 2 NH3(g)
If the system is at equilibrium, what will happen is pressure is added?
Group of answer choices
A. Nothing. Pressure does not affect equilibrium position.
B. The reaction will shift to the right to produce more product.
C. All of the above
D. The reaction will shift to the left to produce more reactants
Answer:
B.) The reaction will shift to the right to produce more product.
Explanation:
When the pressure of a reaction is increased, the equilibrium shifts to the side with less moles of gas.
You can determine the moles of gas by adding the coefficients on each side of the reaction. The reactants have 4 moles of gas (1 + 3 = 4) and the products have 2 moles of gas. Since there are less moles of gas on the product side, the equilibrium will shift to that side. As such, more product will be produced.
1. Calculate the average atomic mass of rubidium. Rubidium has two isotopes, 85Rb and 87Rb. 85Rb has an atomic mass of 84.912 amu and occurs at an abundance of 72.17%. 87Rb has an atomic mass of 86.909 amu and occurs at an abundance of 27.83%. Show your work
is Cu^2+ + 2Br^- --> Cu + Br2 a spontaneous or non-spontaneous redox reaction?
The reaction above is a spontaneous reaction
Cu^2+ + 2Br^- --> Cu + Br2
What is spontaneous redox reaction?A spontaneous redox reaction is a special type of redox reaction which involves the release of energy where the electrons are transferred from from an anode to the cathode
General spontaneous redox reactions is found mostly in electrochemical cells
So therefore, the reaction above is a spontaneous reaction.
Cu^2+ + 2Br^- --> Cu + Br2
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If a 66.5 g sample of ammonium nitrate (NH4NO3) is dissolved in enough water to make 315 mL of solution, what will be the molarity (M)?
Answer:
2.64 M
Explanation:
To find the molarity, you need to (1) convert grams to moles (via molar mass), then (2) convert mL to L, and then (3) calculate the molarity (via molarity ratio). The final answer should have 3 sig figs to match the sigs figs of the given values.
(Step 1)
Molar Mass (NH₄NO₃): 2(14.007 g/mol) + 4(1.008 g/mol) + 3(15.998 g/mol)
Molar Mass (NH₄NO₃): 80.04 g/mol
66.5 grams NH₄NO₃ 1 mole
--------------------------------- x ---------------------- = 0.831 moles NH₄NO₃
80.04 grams
(Step 2)
1,000 mL = 1 L
315 mL 1 L
-------------- x ------------------ = 0.315 L
1,000 mL
(Step 3)
Molarity = moles / volume
Molarity = 0.831 moles / 0.315 L
Molarity = 2.64 M
In the chemical reaction:
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
What is the limiting reactant if you start with 1.8 moles of copper and 2.0 moles of silver nitrate?
Group of answer choices
A. copper (II) nitrate
B. copper
C. silver
D. silver nitrate
Answer:
d
Explanation:
d
The energy required for the hypothetical reaction
2A+B⇌2C+2D
is 309 kJ as written.
How much heat is absorbed when 2.60 mol of A reacts?
Express your answer to three significant figures and include the appropriate unit.
Answer:
402 kJ
Explanation:
Because the energy of the reaction is positive, the reaction is endothermic. This means energy is a reactant.
You can determine how much energy/heat is absorbed using the balanced chemical equation. You can convert the moles A using the ratio composed of the coefficient in front of A and the energy required for each reaction.
2A + B + 309 kJ ⇌ 2C + 2D
2.60 moles A 309 kJ
---------------------- x -------------------- = 402 kJ
2 moles A
What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-, ) = 1.5 x 10^-10. Show how it is worked out.
The pH of a 0.0100 M sodium benzoate solution is determined as 8.09.
What is pH of a solution?The pH of a solution is a measure of hydrogen (H+) ion concentration, which is, in turn, a measure of acidity of the solution.
pH is can also be determined from pOH of the solution as shown below;
pH = 14 - pOH
pH of the benzoate solutionlet the hydroxyl concentration, OH = x
x²/M = kb
x²/0.01 = 1.5 x 10⁻¹⁰
x² = 1.5 x 10⁻¹²
x = √(1.5 x 10⁻¹²)
x = 1.2247 x 10⁻⁶
pOH = - log(OH⁻)
pOH = -log( 1.2247 x 10⁻⁶)
pOH = 5.91
Calculate the value of the pHpH = 14 - 5.91
pH = 8.09
Thus, the pH of a 0.0100 M sodium benzoate solution is determined as 8.09.
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A gram of gasoline produces 45.0kJ of energy when burned. Gasoline has a density of 0.77/gmL. How would you calculate the amount of energy produced by burning 13.L of gasoline?
Set the math up. But don't do any of it. Just leave your answer as a math expression.
Also, be sure your answer includes all the correct unit symbols.
how do I set up the math?
Answer:
See below
Explanation:
45 kJ / gm * .77 gm / liter * 13 liter = _________ kJ
Burning 13 L of gasoline would produce 450,450 kJ of energy. For calculating the amount of energy produced by burning 13 L of gasoline, we can use the given information that 1 gram of gasoline produces 45.0 kJ of energy when burned and the density of gasoline is 0.77 g/mL.
First, we need to convert the volume of gasoline from liters to milliliters since the density is given in grams per milliliter.
13 L = 13,000 mL
Next, we can calculate the mass of the gasoline using the density:
Mass = Volume x Density
Mass = 13,000 mL x 0.77 g/mL
Mass = 10,010 g
Now, we can calculate the amount of energy produced by multiplying the mass of gasoline by the energy produced per gram:
Energy = Mass x Energy per gram
Energy = 10,010 g x 45.0 kJ/g
Energy = 450,450 kJ
Therefore, burning 13 L of gasoline would produce 450,450 kJ of energy.
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Please Help!! Balancing Redox Reactions Worksheet questions 4-7 (see attached)
The balanced redox reaction in the chemical reaction is given below:
40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O
Balancing the redox reaction:
Solution:
1) Half-reactions:
H2S ---> S8
MnO4¯ ---> Mn2+
2) Balance:
8H2S ---> S8 + 16H+ + 16e¯
5e¯ + 8H+ + MnO4¯ ---> Mn2+ + 4H2O
3) Make the number of electrons equal (note that there are no common factors between 5 and 16 except 1):
40H2S ---> 5S8 + 80H+ + 80e¯ <--- factor of 5
80e¯ + 128H+ + 16MnO4¯ ---> 16Mn2+ + 64H2O <---
factor of 16
4) Thus, the final answer is given below;
40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O
What is oxidation-reduction reaction?Oxidation-reduction can simply be defined as a special type of chemical reaction in which the oxidation states of the substrate change.
So therefore, the balanced redox reaction in the chemical reaction is given below:
40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O
Complete question:
Balance the following redox reaction:
MnO4¯ + H2S ---> Mn2+ + S8
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If 1.240g of carbon dioxide dissolves in 1.01L of water at 755mmHg, what quantity of carbon dioxide in grams will dissolve at 790mmHg?
Taking into account the Henry's Law, 1.297 g carbon dioxide will dissolve at 790 mm Hg in 1.01 L water.
Henry's LawA change in pressure does not appreciably influence the solubility of solids or liquids or liquids in liquids; however, that of gases in solvents increases when the partial pressure of the gases increases. The solubility of a gas depends on pressure and temperature.
In this way, Henry's Law describes the effect of pressure on the solubility of gases. This law states that the solubility of a gas in contact with the surface of a liquid at a given temperature is directly proportional to the partial pressure of said gas on the liquid.
Mathematically, Henry's law is expressed as:
C=k×P
Where:
P is the partial pressure of the gas.C is the concentration of the gas.k is Henry's constant, which depends on the nature of the gas, the temperature, and the liquid.At 2 different partial pressure values, the Henry's law is expressed as:
[tex]\frac{C1}{C2} =\frac{P1}{P2}[/tex]
Quantity of carbon dioxideIn this case, you know:
C₁ = [tex]\frac{1.240 g}{1.01 L}[/tex] =1.228 [tex]\frac{g}{L}[/tex]C₂ = ?P₁ = 755 mm HgP₂ = 790 mm HgReplacing in Henry's Law:
[tex]\frac{1.228\frac{g}{L} }{C2} =\frac{755 mmHg}{790mmHg}[/tex]
Solving:
[tex]1.228\frac{g}{L} =\frac{755 mmHg}{790mmHg}xC2[/tex]
C2= [tex]\frac{1.228\frac{g}{L} }{\frac{755 mmHg}{790mmHg}}[/tex]
C2= 1.285 [tex]\frac{g}{L}[/tex]
Then, the concentration of carbon dioxide at 790 mmHg is 1.285 g/L. But you have 1.01 L of water. So the amount of gas dissolved can be calculated as 1.01 L×1.285 g/L = 1.297 g
Finally, 1.297 g carbon dioxide will dissolve at 790 mm Hg in 1.01 L water.
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Question 21
Which of the following salts will produce an acidic solution?
K2CO3
Sr(CIO4)2
KBr
NH41
NaNO3
Answer:
NH4
Explanation:
its an acid duhhhhhhhhh
which water boils can be related to the weather.
Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.
Which water boils can be related to the weather?Water boils quickly when the weather is hot and warm because hot weather has high temperature which leads to the quick evaporation of the water. In hot weather, the liquid water changes into vapor state very quickly as compared to cold temperature.
So we can conclude that Quick boiling of water can be related to the hot weather because in high temperature water changes from liquid state to gaseous state.
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Lithium is located in the first group of the periodic table. How many valence electrons does the element lithium have?
1
2
4
8
Answer: 1
Explanation: Lithium has a single electron in the second principal energy level, and so we say that lithium has one valence electron.
1 is correct
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When potassium permanganate is stirred in water, it turns to purple. How would
you describe whether this mixture is a suspension or a solution?
If you burn 9.1 L of octane gas (C8H18), how many liters of steam will you produce?
From the stoichiometry of the reaction, the volume of the steam produced is 82.9 L
What is combustion?The term combustion is the term that is used to describe the kind of reaction that occurs when a substance is being burnt in oxygen. It is an oxidation reaction and the octane is burnt to produce carbon dioxide and steam.
We can try to write down the equation of the reaction as follows;
2C8H18(g) + 25O2(g) ------> 16CO2(g) + 18H2O(g)
Now 1 mole of octane gas occupies 22.4 L
x moles of octane gas occupies 9.1 L
x = 9.1 L * 1 mole /22.4 L
x = 0.41 moles
Now;
2 mole of octane gas produces 18 moles of steam
0.41 moles of octane gas produces 0.41 moles * 18 moles/2 mole
= 3.7 moles
1 mole of steam occupies 22.4 L
3.7 moles of steam occupies 3.7 moles * 22.4 L/1 mole
= 82.9 L
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Definition
a visual representation of data that uses unconnected plotted points
If a chemical reaction produces 20.0 grams of product, but by stoichiometry it is supposed to have 25.0 grams of product; what is the percent yield of the reaction?
Group of answer choices
A. 125%
B. 75%
C. 20%
D. 80%
At the equivalence point of a titration of the [H+] concentration is equal to:
Group of answer choices
A. 1 x 107 M
B. 7
C. [OH-]
D. 1 x 10-7 M
B. At the equivalence point of a titration of the [H+] concentration is equal to 7.
What is equivalence point of a titration?The equivalence point of a titration is a point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution.
At the equivalence point in an acid-base titration, moles of base equals moles of acid and the solution only contains salt and water.
At the equivalence point, equal amounts of H+ and OH- ions combines as shown below;
H⁺ + OH⁻ → H₂O
The pH of resulting solution is 7.0 (neutral).
Thus, the pH at the equivalence point for this titration will always be 7.0.
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7. What is the name of an element with 3 protons and 5 neutrons?
Answer: Lithium - 8
Answer:
Lithium-8
Explanation:
The atom with three protons and five neutrons that has a mass number of eight is known as lithium-8.
A 7.74 L balloon is filled with water at 3.88 atm. If the balloon is squeezed into a 0.23 L beaker and does NOT burst, what is the pressure of water in the balloon?
Answer:
131 atm
Explanation:
To find the new pressure, you need to use Boyle's Law:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the new pressure (P₂) by plugging the given values into equation and simplifying.
P₁ = 3.88 atm P₂ = ? atm
V₁ = 7.74 L V₂ = 0.23 L
P₁V₁ = P₂V₂ <----- Boyle's Law
(3.88 atm)(7.74 L) = P₂(0.23 L) <----- Insert values
30.0312 = P₂(0.23 L) <----- Simplify left side
131 = P₂ <----- Divide both sides by 0.23
The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2) ? (Think about the basic definition !)
(1) 1/2 X2(g) + 1/2 Y2(g) ↔ XY(g)
(2) 2XY(g) ↔ X2(g) + Y2(g)
The equilibrium constant of the reaction is 76176.
What is the equilibrium constant?In chemistry, the equilibrium constant is used to show the extent to which we can convert reactants to products in a given chemical process. A large value of the equilibrium constant shows that most of the reactants are converted into products under the given conditions. A small value of the equilibrium constant shows that most of the reactants are not converted into products.
Thus, if we have the reactions;
(1) 1/2 X2(g) + 1/2 Y2(g) ↔ XY(g)
(2) 2XY(g) ↔ X2(g) + Y2(g)
It then follows that;
K1 = [XY]/[X2]^1/2 [Y2]^1/2
K2 = [XY]^2/[X2] [Y2]
It is clear that;
K2 = (K1)^2
K2 = (276)^2
K2 = 76176
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