Chapter 8- Rates

Question 1

The effect of temperature ok reactions-

Answer 1

Sodium thiosulphate + hydrochloric acid —> sodium chloride + sulphur + sulphur dioxide + water

1) measure some sodium thiosulphate into a test tube and pet a bung inside
2) measure out less of hydrochloric acid and put in a new test tube with a bung inside
3) put in a water bath of 40•c
4) make a cross and put it under a beaker
5) pour test tubes into a beacker and put a timer on
6) when you cannot see the symbol, stop the timer
7) repeat steps 1-6 again at the water bath 50, 60, 70 and 80

Question 2

Chemical reactions can only occur when…

Answer 2

Particles collide in its each other to make a sufficient energy

Question 3

Rate of reaction=

Answer 3

Volume of gas/ time

Question 4

The minimum amount of energy needed for the reaction to happen is called the…

Answer 4

… activation energy

Question 5

Catalysts-

Answer 5

It lowers the activation energy so it can reached quicker so the reaction can happen faster
They are transition metals so they are found in lots of places

Question 6

The 5 things that can change the rate of reaction-

Answer 6

1) increasing temperature
2) increasing concentration
3) increasing pressure
4) increasing surface area
5) adding a catalyst

Question 7

Anhydrous-

Answer 7

Without water

Question 8

Dynamic equilibrium-

Answer 8

Occurs in a reversible reaction that takes place in both directions within a closed system and a catalyst has no affect on the equilibrium