Measuring rates of reaction Flashcards Preview

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Flashcards in Measuring rates of reaction Deck (17):
1

How can the rate of reaction be observed?

-By measuring how quickly the reactants are used up.
-Or how quickly the products are formed.

2

How can the rate of reaction be calculated?

Amount of reactant used or amount of product formed
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Time

3

How can the rate of reaction be measured?

-Precipitation.
-Change in mass (usually a gas given off).
-The volume of gas given off.

4

What is precipitation when measuring the rate of reaction?

This is when the product of the reaction is a precipitate which clouds the solution.

5

How can you measure the rate of reaction using precipitation?

-By observing a mark through the solution and measuring how long it takes to disappear.
-The quicker the mark disappears means the faster the rate of reaction.

6

When does observing the precipitation of a reaction only work for measuring the rate of reaction?

When the initial solution is see-through.

7

What is the result of using precipitation to measure the rate of reaction?

Very subjective.

8

Why is the result of using precipitation to measure the rate of reaction very subjective?

As different people might not agree over the exact point that the mark disappears.

9

How can you measure the rate of reaction using the change in mass?

-By completing the reaction on a mass balance.
-The quicker the reading drops , the faster the reaction.

10

What method do we use for the rate of reaction graphs?

Usually the change in mass method as it is easy to plot.

11

What method is the most accurate for measuring the rate of reaction?

The change in mass method.

12

Why is the change in mass method the most reliable of the three for measuring the rate of reaction?

Because the mass balance is very accurate.

13

What is the disadvantage of the change in mass method for measuring the rate of reaction?

It releases the gas straight into the room.

14

How can you measure the rate of reaction using the volume of gas given off?

-Using a gas syringe to trap the gas and measure the volume given off.
-The more gas given off during a time interval, the faster the rate of reaction.

15

What could the volume of gas given off be used to plot for the rate of reaction?

A graph of gas volume given off against time elapsed, as a rate of reaction graph.

16

What is good about the volume of gas given off method for measuring the rate of reaction?

That gas syringes usually give accurate volumes to the nearest milimetre.

17

What is bad about the volume of gas given off method for measuring the rate of reaction?

You have to be careful, as if the reaction is too vigorous the plunger could be blown out of the end of the syringe.