Measuring Rate of Reaction Flashcards

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What is meant by the rate of reaction?

It is how fast reactants are used up or products are made in a chemical reaction.

Write a word formula for finding the rate of reaction.

Rate of reaction = amount of reactant used or product formed divided by time taken.

If you measure the volume of gas made, what units could you use for rate?

You can use centimetres cubed per second, written as cm^3/s.

If you measure the mass of a reactant used up, what units could you use for rate?

You can use grams per second, written as g/s.

How do you use a gas syringe to measure the rate of a reaction that makes a gas?

Connect the flask to a gas syringe. Start the reaction and a timer together. Record the gas volume in the syringe at regular times.

How do you use a balance to measure the rate of a reaction that gives off a gas?

Place the flask on a balance. Start the reaction and a timer together. Record the mass at regular times as the mass goes down.

What visual change is used to measure the rate in the disappearing cross experiment?

The mixture turns cloudy so you can no longer see a black cross under the flask.

In the disappearing cross experiment, what do you measure to work out the rate?

You measure the time it takes for the cross to disappear from view.

Why must you measure the time accurately when finding the rate of reaction?

Because rate depends on time, so poor timing gives a wrong value for the rate.

A reaction makes 80 cm^3 of gas in 40 seconds. What is the average rate of reaction?

Rate = volume ÷ time = 80 cm^3 ÷ 40 s = 2 cm^3/s.

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