Rates of Reactions

The rate of a reaction is described as the speed at which the amount of reactants decreases or the amount of ______ increases

• reagents

• gases

• products

• metals

The rate of a reaction can be calculated as the change in concentration, volume or mass divided by _________

• time

• mass

• moles

• rate

When acid is reacted with calcium carbonate the volume of carbon dioxide released is recorded, what equipment could be used to record the volume of gas? (pick all correct answers)

• A pipette

• A burette

• A gas syringe

• A measuring cylinder submerged in water

Which line represents a higher initial rate of reaction?

• 1

• 2

• They both have the same initial rate

As the reaction progresses both lines plateau, why is this the case?

• The rate of reaction is at a constant high rate

• The reaction has reached the maximum rate

• The reaction has stopped and no more carbon dioxide is produced.

What might cause the difference between line 1 and 2?

• Reaction 1 contains a solid with a higher surface area than the solid in reaction 2

• Reaction 1 is carried out at a higher temperature than reaction 2

• Reaction 1 uses a catalyst and reaction 2 does not.

• Reaction 1 has a greater number of moles of reactants than reaction 2.

Substances which are powdered will react faster, this is because...

• A smaller surface area of solid will result in more frequent successful collisions

• A larger surface area of solid will result in more frequent successful collisions

• A larger surface area of solid will result in the particles having higher energy and therefore more particle will have the required activation energy.

• A smaller surface area of solid will result in the particles having higher energy and therefore more particle will have the required activation energy.

Collision theory states that for a reaction to take place the the particles must collide with sufficient energy for the collision to result in a reaction. This amount of energy is called the...

• collision energy

• frequency energy

• activation energy

• success energy

The reaction profile digram is shown for an exothermic reaction, which arrow represents the activation energy?

• A

• B

• C

The reaction between an acid and calcium carbonate was carried out (reaction 1) it was repeated at a higher temperature. Which line (or lines) could represent the reaction?

• 1

• 2

• 3

• 4