Answers MO-Physical Science A-CRShifts in Equilibrium

Shifts in Equilibrium — Unit test Answers

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For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?

reactants: 1; products: 1

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reactants: 1; products: 2

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reactants: 2; products: 1

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reactants: 2; products: 2

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In the hypothetical reaction below, substance A is consumed at a rate of 2.0 mol/L·s. If this reaction is at dynamic equilibrium, at what rate will substance B be consumed?A B

0.0 mol/L·s

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1.0 mol/L·s

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2.0 mol/L·s

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4.0 mol/L·s

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best

There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products.

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The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.

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There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products.

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There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the products.

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Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc?

Ca → ZnCO3 + CaCO3 → Zn

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Ca + ZnCO3 → CaCO3 + Zn

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CaCO3 + Zn → Ca + ZnCO3

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CaCO3 + Zn + Ca → ZnCO3

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What are the coefficients for the reaction _Cl2O5 + _H2O → _HClO3 once it is balanced?

1, 1, 1

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1, 1, 2

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1, 2, 2

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2, 1, 1

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Consider the following chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. HC2H3O2(aq) H+(aq) + C2H3O2–(aq)yellow blue What will be the color of the solution if a large amount of H2CO3 is added?

The solution will remain yellow.

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The solution will turn blue.

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The solution will turn pink.

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The solution will turn green.

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best

The activation energy was reached at 10:45 a.m. Without the additional energy, the reaction would have stopped.

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The activation energy was reached at 11:15 a.m. The previous change was the threshold point for a reaction.

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The activation energy was reached at 10:15 a.m. The additional energy allowed for a lower activity level.

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The activation energy was reached was 10:45 a.m. The additional energy did not affect the reaction.

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Consider the chemical equation in equilibrium. A(g) + 2B(g) C(g) + D(g) + heat What will happen to the equilibrium of this reaction if the temperature is increased?

It will shift to the left because heat is released.

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It will shift to the left because heat is absorbed.

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It will shift to the right because heat is released.

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It will shift to the right because heat is absorbed.

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Which type of reaction is Mg + S → MgS?

polymerization

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synthesis

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replacement

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decomposition

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Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O?

Ca(OH)2 + H3PO4 → Ca3(PO4)2 + 6H2O

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3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O

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3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 3H2O

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Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O

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The first chart shows the effect of the normal breakdown of material from reactants to products. The second chart shows the same reaction but with an added modification.

Reaction A has an enzyme.

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Reaction B has an enzyme.

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Reaction A has an inhibitor.

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Reaction B has an inhibitor.

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Which element has fewer than four dots in its electron dot diagrams?

arsenic (As)

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sulfur (S)

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krypton (Kr)

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gallium (Ga)

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According to Le Chatelier’s principle, what happens when the concentration of a product is reduced in a chemical reaction that was in equilibrium?

The equilibrium shifts to the right to favor the formation of products.

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The equilibrium shifts to the left to favor the formation of reactants.

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The equilibrium shifts in the exothermic direction.

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The equilibrium shifts in the endothermic direction.

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Which represents an endothermic reaction?

wood burning in a fire

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splitting a gas molecule

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using a heat pack on an injury

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TNT exploding

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In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

18 g

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54 g

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72 g

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90 g

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Shifts in Equilibrium — Unit test Answers

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