Rate Of Reactions

Question 1

For a reaction to take place, what two things must happen?

Answer 1

Particles must collide

They must have sufficient energy

Question 2

What is activation energy?

Answer 2

The energy required for a reaction to occur

Question 3

A negative factor for the precipitation experiment?

Answer 3

Different people might not agree over the exact point when the marker disappears.

Question 4

Negative factor for the ‘change in mass’ experiment?

Answer 4

If the flask becomes too hot, mass is lost through evaporation as well as the reaction.

Question 5

Negative factor for the ‘volume of gas given off’ experiment?

Answer 5

If the reaction is too vigorous, the plunger can be blown out of the end of the syringe.

Question 6

Name the three methods of measuring the speed of a reaction:

Answer 6

Precipitation
Change in mass
The volume of gas given off

Question 7

What is a precipitate?

Answer 7

An insoluble solid

Question 8

What are the 5 factors that affect the rate of reaction?

Answer 8

Concentration
Temperature
Pressure (only affects gases)
Surface area 
Catalyst

Question 9

Is using a light sensor for a precipitate experiment more accurate?

Answer 9

Yes. More accurate, more reproducible, more reliable

Question 10

When an acid reacts with a metal carbonate, what three products are formed?

Answer 10

Salt
Carbon dioxide
Water

Question 11

Explain why counting bubbles is a bad idea to observe a reaction

Answer 11

There are too many bubbles to count

Question 12

Advantage of using mass loss method instead of gas syringe method

Answer 12

Easy, quick to set up, accurate

Question 13

Disadvantage of using mass loss method instead of gas syringe method

Answer 13

You are losing product, not as accurate as a gas syringe