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Which property of manganese dioxide helps it turn hydrogen peroxide into water faster than it would without it? (5 points)

 a

Manganese dioxide is an acid.

 b

Manganese dioxide is a catalyst.

 c

Manganese dioxide is highly reactive.

 d

Manganese dioxide is used up very fast.

Question 7 (5 points)

(07.05 MC)

When small pieces of manganese oxide were added to a solution of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction. Which of the following is likely to increase the rate of the reaction? (5 points)

 a

Reducing the number of pieces of manganese oxide used

 b

Increasing the amount of solution

 c

Using one cube of equal mass of manganese oxide

 d

Chilling the hydrogen peroxide solution

Question 8 (5 points)

(07.05 MC)

The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would explain a lower rate after another 3 seconds? (5 points)

 a

The concentration of reactants increased while the concentration of product decreased.

 b

The concentration of reactants decreased while the concentration of product increased.

 c

All concentrations of reactants and products decreased.

 d

All concentrations of reactants and products increased.

Question 9 (5 points)

(07.06 LC)

Which statement is true about a reversible reaction? (5 points)

 a

It has equal mass of all reactants.

 b

It produces salts from acids and bases.

 c

It has equal number of products and reactants.

 d

It results in an equilibrium mixture of reactants and products.

Question 10 (5 points)

(07.07 LC)

Why does the equilibrium of a system shift when the pressure is decreased? (5 points)

 a

To maximize the stress on the system

 b

To stop restoring equilibrium to the system

 c

To increase the total moles of gas in the system

 d

To decrease the total moles of gas in the system

Answer & Explanation
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