Factors that affect reaction rates

Which of the following increase the reaction rate?

• less surface area

• lower temperature

• increasing pressure

• increased concentration

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NGSS.HS-PS1-5

A catalyst works by

• changing the order of the reaction

• increasing the temperature

• lowering the amount of energy needed

• making the activated complex

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NGSS.HS-PS1-4

If the temperature is reduced, a reaction rate will ______

• increase

• decrease

• stay the same

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NGSS.HS-PS1-5

If the concentration of a reactant is increased, the reaction rate will ___________.

• increase

• decrease

• stay the same

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NGSS.HS-PS1-5

The ____________ states that atoms, ions, or molecules must collide in order to react.

• transition state

• activation energy

• rate law

• collision theory

The rate of a chemical reaction is NOT affected by which of the following:

• temperature
• concentration
• particle size (surface area)
• All of these affect reaction rates

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NGSS.HS-PS1-5

The rate of a reaction increases as temperature__________________.

• Decreases
• Increases
• Stays the Same

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NGSS.HS-PS1-5

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

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NGSS.HS-PS1-5

Products will form faster if____________

• the particle size of the reactants are larger.
• temperature is decreased.
• concentration of the reactants are increased.
• the reaction is not stirred.

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NGSS.HS-PS1-5

How does temperature increase the rate of a chemical reaction?

• Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.

• Increased number of collisions increases the chance of a 'successful collision'

• Particles collide faster and harder so a larger proportion have greater energy than the required activation energy.

• Greater number of 'active sites' available for a reaction to take place (referring to solids)

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NGSS.HS-PS1-5