Term 1 Week 4 Topic 2.1

Grinding an effervescent tablet into powder increases the rate of reaction due to increase of

• concentration

• total surface area

• temperature

• size

Which factors affect the rate of a reaction?

• temperature

• concentration

• size

• pressure

• catalyst

Increase in temperature causes the particles to

• slow down

• move faster

• stay apart from each other

• move in the correct order

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of reactant particles

• it increases the frequency of collision

Why does a higher temperature increase the rate of a reaction?

• It increases both the frequency collision and energy of reactant particles

• It only increases the frequency of collision

• It only increases the energy of reactant particles

• It reduces the activation energy of the reaction

Increasing the temperature gives particles more __________.

• time

• energy

• space

• frequency

As the frequency of ________________ collision increases, the rate of reaction increases.

• time

• speed

• effective

• efficient

Why does breaking up a solid reactant increase the rate of reaction?

• it creates more solid

• it creates more energy

• it increases the total surface area

• it increases the concentration

Catalyst helps to

• increase the amount of product obtained

• to lower the activation energy

• provide an alternative reaction route

• decrease the frequency of collision

Diagram 12 shows an energy profile diagram. E_a is the activation energy for the decomposition of hydrogen peroxide.

P

Which of the following is the activation energy for the dissociation of hydrogen peroxide when manganese(IV) oxide (a catalyst) is added?

• P

• Q

• R

• S