Factors Affecting the Rate of Chemical Reactions

A catalyst increases the efficiency of collisions between reactants.

• true

• false

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NGSS.HS-PS1-5

Which would not speed up a chemical reaction?

• Using a large beaker

• Increasing the concentration

• Decreasing particle size

• adding a catalyst

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NGSS.HS-PS1-5

Which factors increase the rate of a reaction?

• increasing temperature

• increasing concentration

• increasing surface area

• all of the above

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NGSS.HS-PS1-5

Limestone chunks are reaction with hydrochloric acid solution at constant temperature with average speed. If we crash the chunks of limestone into powder how would speed of reaction change?

• Reaction speeds up

• Reaction does not change

• Reaction slows down

• Reaction stops

Which of the following is NOT a factor affecting reaction rate?

• temperature

• catalysts

• particle size

• polarity

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NGSS.HS-PS1-5

Decreasing the particle size increases the reaction rate because

• It makes particles move faster

• It increases the likelihood of collisions with the correct geometry

• It decreases the surface area available to react

• It increases the number of collisions

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NGSS.HS-PS1-5

The catalyst alters the rate of a chemical reaction by,

• providing an alternative pathway with a lower Ea

• changing the products formed in the direction of the reaction

• providing a surface on which the molecules react

• increasing the frequencies of collisions between molecules

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NGSS.HS-PS1-5

Which of the following are true of reaction rates?

• II+III+IV

• I+IV

• II + III

• I+II+III

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NGSS.HS-PS1-5

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 best describes why increasing temperature increase reaction rate?

• Activation energy is reduced.

• Collisions become more frequent.

• Collisions become more energetic.

• Collisions become more frequent and more energetic.

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NGSS.HS-PS1-5