Chemical Reactions and Factors Affecting Reaction Rate

Under which of the following conditions will marble (calcium carbonate) react most rapidly with hydrochloric acid?

• Marble chips and concentrated acid at 200C

• Marble powder and dilute acid at 200C

• Marble chips and dilute acid at 400C

• Marble powder and concentrated acid at 400C

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NGSS.HS-PS1-5

A change in the amount of reactant or product affects the rate of reaction.

• True

• False

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NGSS.HS-PS1-5

The rate of forward reaction is _______, because of the high concentration of reactants

• lowest

• highest

• moderate

• minimal

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NGSS.HS-PS1-5

The speed of a chemical reaction is called reaction rate. 

• True

• False

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NGSS.HS-PS1-5

Which of the following factors does NOT affect the rate of a chemical reaction?

• Temperature

• Concentration of reactants

• Color of reactants

• Surface area of reactants

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NGSS.HS-PS1-5

How does increasing the temperature generally affect the rate of a chemical reaction?

• It decreases the reaction rate.

• It has no effect on the reaction rate.

• It increases the reaction rate.

• It stops the reaction.

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NGSS.HS-PS1-5

What effect does increasing the concentration of reactants have on the rate of reaction?

• It decreases the rate of reaction.

• It has no effect on the rate of reaction.

• It increases the rate of reaction.

• It stops the reaction.

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NGSS.HS-PS1-5

which factor that affect reaction rate is represented?

• Temperature

• Catalyst

• Surface Area

• Concentration

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NGSS.HS-PS1-5

Which of the following statement is not true about catalysts?

• They have no effect on the position of equilibrium once it is attained.

• They lessen the time taken to attain equilibrium.

• They speed up a chemical reaction.

• They have effects on the position of equilibrium once it is attained.

This factor doesn’t affect chemical equilibrium in a reaction.

• Change in catalyst

• Change in pressure

• Change in concentration

• Change in temperature

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NGSS.HS-PS1-6