Rates of reaction

Question 1

What are the signs of a chemical reaction

Answer 1

Colour change, temperature change, gas given off, a new substance formed and a solid formed (precipitate)

Question 2

What are the factors that affect the speed of a chemical reaction

Answer 2

A catylist, temperature, concentration and partcial size

Question 3

What is the gas test for carbon dioxide

Answer 3

Turns lime water milky/cloudy

Question 4

What is the gas test for hydrogen

Answer 4

Burns with a pop

Question 5

What is the gas test for oxygen

Answer 5

Relights a glowing splint

Question 6

What is the equation for the rate of a reaction

Answer 6

Rate = mass of gas’s produced
———————————
Time

Question 7

How do you calculate the average rate

Answer 7

Average rate = change in mass
———————-
Change in time

Question 8

What must happen for a reaction to occur

Answer 8

In order for a reaction to occur reactant particles must collide

Question 9

What must happen for a reaction to speed up

Answer 9

We need to increase the number of collisions

Question 10

What does it mean when we use partical size to increase the collisions and how would you do this

Answer 10

You increase the surface area of one of the reactants by grinding it into a powder

Question 11

What does it mean when we speed up a reaction using concentration

Answer 11

When there are more reactant particals in a given volume of space

Question 12

What happens when you increase the temperature of a partical

Answer 12

They have more energy and this makes more collisions