C8.1 - Rate of reaction

Question 1

The rate of a chemical reaction tells you what?

Answer 1

The rate of a chemical reaction tells you how fast reactants turn into products

Question 2

In your body, what are taking place all the time?

Answer 2

In your body, there are lots of reactions taking place all the time

Question 3

In your body, there are lots of reactions taking place all the time.
The reactions happen at the correct rate to do what?

Answer 3

The reactions happen at the correct rate to supply your cells with what they need, whenever required

Question 4

In your body, there are lots of reactions taking place all the time.
The reactions happen at the correct rate to supply your cells with what they need, whenever required.
Where is reaction rate also very important?

Answer 4

Reaction rate is also very important in the chemical industry

Question 5

Reaction rate is also very important in the chemical industry.
What does any industrial process have to do?

Answer 5

Any industrial process have to make money by producing useful products

Question 6

Any industrial process has to make money by producing useful products.
What does this mean?

Answer 6

This means that the right amount of product needed must be made as cheaply as possible

Question 7

Any industrial process has to make money by producing useful products.
This means the right amount of product needed must be made as cheaply as possible.
What happens if it takes too long to produce?

Answer 7

If it takes too long to produce, it will be hard to make a profit when it is sold

Question 8

Any industrial process has to make money by producing useful products.
This means the right amount of product needed must be made as cheaply as possible.
If it takes too long to produce, it will be hard to make a profit when it is sold.
What must the rate of reaction be?

Answer 8

The rate of reaction must be fast enough to make the product quickly

Question 9

Reactions happen at what rates?

Answer 9

Reactions happen at all sorts of different rates

Question 10

Reactions happen at all sorts of different rates.

Example of a really fast reaction

Answer 10

An example of a really fast reaction is the combustion of chemicals inside a firework exploding

Question 11

Reactions happen at all sorts of different rates.

Example of a very slow reaction

Answer 11

An example of a very slow reaction is an old piece of iron rusting

Question 12

How to work out the rate of a chemical reaction

Answer 12

There are 2 ways to work out the rate of a chemical reaction, you can find out how quickly the
1. Reactants are used up as they make products
Or,
2. Products of the reaction are made

Question 13

How to calculate the rate of reaction at a specific time using a reaction graph

Answer 13

To calculate the rate of reaction at a specific time using a reaction graph:

1. Draw a tangent to the curve at that time
2. Construct a right-angled triangle using the tangent as its hypotenuse, longest side
3. Calculate the gradient of the tangent

Question 14

What happens the steeper the line on the graph?

Answer 14

The steeper the line on the graph, the faster the rate of reaction

Question 15

Mean rate of reaction

Answer 15

Mean rate of reaction is quantity of:
1. Reactant used ÷ Time
Or,
2. Product formed ÷ Time

Question 16

Any industrial process has to make money by producing useful products.
This means the right amount of product needed must be made as cheaply as possible.
If it takes too long to produce, it will be hard to make a profit when it is sold.
The rate of reaction must be fast enough to make the product quickly, but what?

Answer 16

The rate of reaction must be fast enough to make the product quickly, but safely