C2.4 Rates and Energy Flashcards

1
Q

What is activation energy?

A

The minimum energy required to start a chemical reaction

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2
Q

Describe how using smaller marble chips affect the rate of reaction?

A

Increases surface area

Increases rate of reaction

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3
Q

Explain how using smaller marble chips affect the rate of reaction?

A

Increases the amount of marble chips exposed

so there are more frequent collisions

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4
Q

Explain how increasing temperature affects the rate of reaction?

A

Particles move faster
so collide more frequently
increasing the rate of reaction

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5
Q

Explain how increasing concentration affects the rate of reaction?

A

Particles are more crowded
so collide more frequently
increasing the rate of reaction

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6
Q

How do catalysts affect the rate of reaction?

A

Lower the activation energy

increasing the rate of reaction

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7
Q

what is an advantage of using a catalyst to speed up a chemical reaction?

A

Uses less energy
so costs less
produces less carbon dioxide reducing global warming

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8
Q

What is an exothermic reaction?

A

Transfers energy to the surroundings

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9
Q

What is an endothermic reaction?

A

Absorbs energy from the surroundings

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10
Q

In a reversible reaction, if the forwards reaction is exothermic, the backwards reaction is….

A

endothermic.

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