science chapter 8

Which of these doesn't speed the rate of reaction

• Concentration increase

• Grain size decrease

• Temperature increase

• Surface area increase

Doing test 3 times makes it reliable, true or false?

How to measure rate of reaction?

• Timer and balance

• Remove anomalous result

• Observing the test

What are some examples of rate of reaction?

• How long it takes for colour to change

• How much products produced in given time

• How long it takes for fizzing to stop

• How long it takes for products to be used up

Which describes anomalous result?

• The unexpected result

• The result that doesn't fit in the pattern

• The result that fits in the pattern

• The unusual result

Grain size increase, rate of reaction increase. True or false?

• True

• False

Temperature increase, rate of reaction increase

Because more particles are available to react with each other

Particles of reactant collide with each other more frequently

More effective collision

More product gas is produced in a shorter time

• True

• False

Surface area increase, rate of reaction increase

Because more particles are available to react

Particles of reactant collide with each other more frequently

More effective collision

More gas product is produced in a shorter time

• True

• False

How to know if Carbon dioxide gas is present?

• Put lighted splint on the mouth of test tube, if it extinguishes carbon dioxide is present

• Put glowing splint on the mouth of test tube, if it relights, carbon dioxide is present

• Put a lighted splint on the mouth of test tube, if it makes a pop sound, carbon dioxide is present

Concentration increase, rate of reaction increase

Because particles gain more energy and move faster

Particles of reactant collide with each other more frequently

More frequent collision

So more product gas is produced in a shorter time

• True

• False