Periodic groups and rates of reactions ( paper 2)

Question 1

why does the rate of reaction increase when temperatures increase

Answer 1

.particles have more energy and so move faster
.this increases frequency of collisions
.higher proportion of collisions have enough energy to at least reach the activation energy required for reaction to take place

Question 2

what is are properties that plastic food wrapping must have Poly(dichloroethene)

Answer 2

.non-toxic, stopping food from becoming toxic
.unreactive so it doesn’t react with food
.flexible so it can wrap around all the food

Question 3

what happens when dilute HCL is mixed with sodium thiosulfate

Answer 3

mixture turns cloudy as sulphur forms a precipitate