Rates of reaction

Question 1

What happens to the temperature in a neutralisation reaction

Answer 1

It goes up

Question 2

What happens to the temperature in a displacement reaction

Answer 2

Depending on the metal depends on how much the temp rises if it is magnesium (very reactive) it rises a lot but iron (not reactive) doesn’t rise much

Question 3

What does rate of reaction mean

Answer 3

The speed of the reaction

Question 4

Why is it important to control the rate of reaction

Answer 4

For safety reasons and for economic reasons

Question 5

What is the equation for the rate of reaction

Answer 5

Rate of reaction = amount of reactant used/ time
Or
Amount of product formed/ time

Question 6

What units do rate of reaction use

Answer 6

g/s g/min
Cm3/s cm3/min

Question 7

What is the triangular tube called

Answer 7

Conical flask

Question 8

What is the symbol for hydrochloric acid

Answer 8

HCl

Question 9

How do we measure how much gas is produced in an experiment

Answer 9

1) put an upturned cylinder into water and as the gas goes in it will displace the water
2) use a gas syringe
3) measure mass of reaction mixture before and after the reaction

Question 10

As the reaction progresses what happens to the speed of it

Answer 10

It starts of at a certain speed and then get slower and slower until they stop

Question 11

What happens to the concentration of the reactants as the reaction progresses

Answer 11

It decreases

Question 12

How do you calculate gradient

Answer 12

Y axis/X axis

Question 13

What is the limiting reactant

Answer 13

The reactant that runs out first

Question 14

What is the limiting reactant directly proportional to

Answer 14

Product formed

Question 15

Why would cotton wool be used as a bung

Answer 15

To prevent the liquid form escaping

Question 16

How does surface area make a difference to the rate of reaction

Answer 16

The smaller the reactant crushed marbles the faster the rate of reaction because there are more frequent collisions we increase the number of particles available to react. This means more frequent collisions and a greater chance of reaction

Question 17

How does concentration affect the rate of reaction

Answer 17

If the concentration increases this does the rate of reaction

Question 18

Calcium carbonate (CaCo3) +hydrochloric acid (HCl)= ???

Answer 18

Calcium chloride (CaCl2) + water(H2O) +carbon dioxide (CO2)

Question 19

Why does the mass change in a rate of reaction experiment

Answer 19

Because gas produced escapes unless you catch it

Question 20

In terms of concentration when does the reaction spread up

Answer 20

When there is more concentrated acid therefor a crowded space do more frequent collisions

Question 21

What does increasing pressure do to the reaction

Answer 21

The reaction speeds up because the space in which the gas particles are moving is smaller so they are closer together increasing the frequency of collisions making them more likely to react

Question 22

If an reaction has a product with liquids and a solid in it what does it look like

Answer 22

It is cloudy because of the solid