Rates of reaction

Question 1

What is the rate if a chemical reaction?

Answer 1

How fast the reactants are changed into products .

Question 2

What is one of the slowest chemical reactions ?

Answer 2

The rusting of iron.

Question 3

What other slow chemical reactions are there ?

Answer 3

Chemical weathering - like acid rain damage to limestone buildings.

Question 4

What is an example of a moderate speed reaction?

Answer 4

The metal magnesium reacting with an acid to produce a gentle stream of bubbles.

Question 5

What is an example of a fast reaction ?

Answer 5

Burning is a fats reaction , but explosives are even faster and release a lot of gas. Explosive reactions are all over in a fraction of a second

Question 6

How do you find the speed of reaction for a graph on the rate of reaction?

Answer 6

By recording the amount of product formed or reactant used up over time.

Question 7

What is the relationship between the line on the graph for the rate of reaction and the rate of reaction ?

Answer 7

The steeper the line on the graph , the fast the rate of reaction.

Question 8

How are the quickest reaction presented on a rate of reaction graph ?

Answer 8

The quickest reactions have the steepest lines and become flat in the least time.

Question 9

What does the rate of reaction depend on ?

Answer 9

1. The collision frequency of particles ( how often they collide). The more collisions there are the faster the reaction is. E.g. doubling the frequency of collision doubles the rate.
2. The energy transferred during a collision. Particles have to collide with enough energy for the collision to be successful.