rate of reaction

Question 1

what does the rate of a reaction measure?

Answer 1

how much product is formed in a fixed period of time

Question 2

how can the rate of reaction be worked out?

Answer 2

by finding the gradient of a graph

Question 3

how do you work out the gradient of a graph?

Answer 3

y divided by x

Question 4

what are limited reactants?

Answer 4

is the reactant not in excess that gets used up by the end of the reaction

Question 5

when do reactions occur?

Answer 5

when particles collide together

Question 6

how can the gas be collected at the end be estimated?

Answer 6

by interpolation

Question 7

how can the volume of the gas be collected at the end be estimated?

Answer 7

extrapolation

Question 8

what are explosions?

Answer 8

very fast reactions that make large volumes of gas

Question 9

what produces the explosive force in a explosion?

Answer 9

the gas molecules moving away from the centre

Question 10

name 1 use of explosions?

Answer 10

explosive forces split large sections of rock so that the metal ores can be extracted

Question 11

name a fast and slow reaction?

Answer 11

fast- burning and explosions

slow-rusting

Question 12

what is reaction time?

Answer 12

time taken for the reaction to finish. The shorter the reaction time the faster the reaction

Question 13

why is it important in industry that a reaction is not too slow or too fast?

Answer 13

slow-factory may not be able to make a material efficiently and will lose money
fast-there could be a risk of a dangerous explosion

Question 14

at what point in a reaction is it fast and slow?

Answer 14

fast to begin then slow once reactants are used up

Question 15

what might a reaction be measured in if it is slow?

Answer 15

cm3/min

Question 16

what might a reaction be measured in if it is fast?

Answer 16

cm3/s

Question 17

if a reactant is in excess what is it called?`

Answer 17

a limited reactant

Question 18

when is a limited reactant used up in a reaction?

Answer 18

by the end

Question 19

what is the amount of product directly proportional to?

Answer 19

the amount of limited reactant used

Question 20

what increases when the amount of reactant is used?

Answer 20

the amount of product

Question 21

when do reactions occur?

Answer 21

when particles collide together with sufficient energy to react

Question 22

what happens in a chemical reaction?

Answer 22

reactants are made into products

Question 23

what is the reaction time of a chemical reaction?

Answer 23

the time taken for the reaction to finish