Chemical Reaction Rates

What is the effect of increasing the temperature on 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

Answer explanation

Increasing the temperature provides more energy to the reactants, leading to more frequent and effective collisions. This generally increases the reaction rate, increasing the reaction rate.

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NGSS.HS-PS1-5

What happens to the rate of a chemical reaction when the surface area of a solid reactant is increased?

• The rate decreases.

• The rate increases.

• The rate remains the same.

• The rate becomes zero.

More collisions correspond to a:

• Faster reaction rate  

• Slower reaction rate

• Constant reaction rate 

• None of the above

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NGSS.HS-PS1-5

Which of the following statements is true about reaction rates?

• Reaction rates are always constant.

• Reaction rates can be increased by decreasing the temperature.

• Reaction rates can be increased by increasing the concentration of reactants.

• Reaction rates are unaffected by the presence of a catalyst.

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NGSS.HS-PS1-5

As concentration increases, reaction rate .......

• Increases

• decreases

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NGSS.HS-PS1-5

Which of the following is true about reaction rates?

• increase as temperature decreases

• decrease when a catalyst is added

• increase as surface area increases

• decreases as reactant concentration increases

Tags

NGSS.HS-PS1-5

How quickly a reaction will take place is called what?

• Reaction Rate

• Temperature

• Catalyst

• Pressure

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NGSS.HS-PS1-5

As a reaction proceeds, the concentration of reactants will _______ and the concentration of products will ________.

• increase, decrease

• increase, increase

• decrease, decrease

• decrease, increase

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NGSS.HS-PS1-5

________ the concentration ______ the reaction rate.

• increasing; decreases

• increasing; increases

• decreasing; increases

• decreasing; does not effect

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NGSS.HS-PS1-5

Enzymes in your body act as catalysts. Thus, the role of enzymes is to___________.

• inhibit chemical reactions.

• increase the rate of chemical reactions.

• decrease the rate of chemical reactions.

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NGSS.HS-PS1-5