Effect of Temperature Flashcards

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What happens to the rate of a chemical reaction when the temperature is increased?

The rate of reaction increases. The reaction happens faster.

What happens to the rate of a chemical reaction when the temperature is decreased?

The rate of reaction decreases. The reaction happens more slowly.

Why does heating a reaction mixture make the particles collide more often?

Heating gives the particles more kinetic energy. They move faster and collide more often.

In terms of particle energy, why does a higher temperature make a reaction go faster?

At a higher temperature, particles have more energy. More particles have enough energy to react when they collide.

Why does cooling a reaction mixture slow down the rate of reaction?

Cooling removes energy from the particles. They move more slowly, collide less often, and fewer collisions have enough energy to react.

How could you show in a lab that temperature affects the rate of a reaction that produces a gas?

Do the same reaction at two different temperatures. Measure the gas made in a set time. More gas in the same time at the higher temperature shows the rate is faster.

Why does keeping food in a fridge slow it going off, in terms of reaction rate?

The low temperature slows the chemical reactions that make food spoil. Slower reactions mean the food stays fresh for longer.

Why can a small increase in temperature cause a big increase in the rate of reaction?

A small rise in temperature gives many more particles enough energy to react. This makes many more collisions successful each second.

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