GCSE Rates of Reaction flashcard

Front

What is the role of a catalyst in a chemical reaction?

Back

It increases the rate of the reaction.

Front

What is the effect of increasing the temperature on the rate of reaction?

Back

The rate of reaction increases.

Front

Why should the same person look at the black cross each time during the experiment investigating colour change?

Back

To ensure consistent judgment of when the cross disappears.

Front

What precaution should be taken to avoid burns from hot sodium thiosulfate solution?

Back

Do not heat above 60°C.

Front

What is a 'successful' collision in the context of reaction rates?

Back

A collision that results in the formation of products.

Front

What happens to the frequency of collisions when the temperature is increased?

Back

It increases.

Front

What is the effect of increasing the surface area to volume ratio on the rate of reaction?

Back

The rate of reaction increases.

Front

Which of the following is NOT a precaution for handling sulfur dioxide?

• Do not heat above 60°C.
• Make sure the laboratory is well ventilated.
• Avoid breathing directly over the top of the flask.
• Wear gloves and eye protection.

Back

Do not heat above 60°C.

Front

What is the role of enzymes in industrial reactions?

Back

They allow reactions to happen at lower temperatures and pressures.

Front

What is the effect of a catalyst on the activation energy of a reaction?

Back

It decreases the activation energy.