Chemistry revision C2.4 rates of reaction

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  • Created by: melisa
  • Created on: 18-09-13 22:34
he rate of reaction increases as the temperature increases. Which of the following statements provides the best explanation for this?
The rate of reaction increases as the temperature increases because at higher temperatures the particles have more energy, move faster and collide more often.
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Which of the following statements about collisions is correct?
Reactions can happen if the colliding particles have enough energy.
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Reactions eventually stop. What is generally the reason for this?
Reactions stop when one or more of the reactants is used up.
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In a reaction with hydrochloric acid, powdered magnesium reacts faster than the same mass of magnesium ribbon. Why is this?
Powdered magnesium reacts faster than magnesium ribbon because it has a bigger surface area.
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Marble reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide. In which of these mixtures is the rate of reaction likely to be the greatest?
Powdered marble at a high temperature will react faster than marble chips or powder at a lower temperature.
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Manganese dioxide is a black powder that catalyses the breakdown of hydrogen peroxide to water and oxygen. Which of the following statements is correct?
If manganese dioxide is acting as a catalyst, its mass will stay the same during the reaction.
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Card 2

Front

Which of the following statements about collisions is correct?

Back

Reactions can happen if the colliding particles have enough energy.

Card 3

Front

Reactions eventually stop. What is generally the reason for this?

Back

Preview of the front of card 3

Card 4

Front

In a reaction with hydrochloric acid, powdered magnesium reacts faster than the same mass of magnesium ribbon. Why is this?

Back

Preview of the front of card 4

Card 5

Front

Marble reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide. In which of these mixtures is the rate of reaction likely to be the greatest?

Back

Preview of the front of card 5
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