C7 Kinetics (Rates of Reaction)

Question 1

Reaction rate

Answer 1

The speed at which a chemical is used up or produced

Question 2

Surface Area

Answer 2

A way of increasing rate of reaction of a solid. Powders have a large surface area

Question 3

Concentration

Answer 3

Measurement of amount of solute per unit volume of a solution (moles per dm^3). Another way of speeding up a reaction

Question 4

Catalyst

Answer 4

A chemical that speeds up a reaction but is not used up in the process. It reduces the activation energy required, there are not more frequent collisions, but more successful collisions

Question 5

Temperature

Answer 5

Increasing the kinetic energy of particles. Also speeds up a chemical reaction

Question 6

Activation energy

Answer 6

The amount of energy needed to start a reaction. Some energy needs to be put in in order to have more energy produced

Question 7

Increased concentration and effects on rate of reaction

Answer 7

As there are more particles, there are more frequent collisions, and rate of reaction is faster

Question 8

Increased surface area and effects on rate of reaction

Answer 8

As there are more particles available to react, there is an increase in frequency of collisions, and rate of reaction is faster

Question 9

The addition of a catalyst and effects on rate of reaction

Answer 9

The rate of reaction would increase up to a point

Question 10

The best catalyst for hydrogen peroxide

Answer 10

Manganese (IV) oxide

Question 11

Increased temperature and effects on rate of reaction

Answer 11

The particles move faster and with more energy, and therefore collide more frequently and with greater succession, resulting in a faster rate of reaction