This is usually expressed as the change in the amount of reactant or product per unit time.

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NGSS.HS-PS1-5

According to collision theory, atoms, ions, and molecules can react to form products when they collide if the particles have enough ___________ and at proper orientation.

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NGSS.HS-PS1-5

The minimum energy that colliding particles must have in order to react is called the ____________.

A model used to relate the properties of particles to the rates of chemical reactions.

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NGSS.HS-PS1-5

One factor affecting reaction rate is Concentration.

Increasing the concentration results to ____________________.

• lower reaction rate

• higher reaction rate

• slows down the reaction

• lowers the activation energy

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NGSS.HS-PS1-5

How does particle size affect the reaction rate? Increasing the particle size, ___________ the reaction rate.

• speeds up

• slows down

• increases slightly

• does not change

To speed up the reaction rate, you can increase the surface area of solids by ________________.

• grinding it into a fine powder

• increasing the concentration

• lowering the temperature

• forming it into a ball

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

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NGSS.HS-PS1-5

A catalyst increases the rate of reaction by _______________.

• increasing the amount of reactants

• increasing the surface area

• lowering the activation energy

• lowering the temperature required

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NGSS.HS-PS1-5

The video mentioned that in biological reactions, the catalysts are called __________.