Chemistry Unit 2

Question 1

How does presence of a catalyst increase rate of a chemical reaction

Answer 1

The presence of a catalyst speeds up chemical reactions by reducing the ACTIVATION ENERGY by providing an alternate reaction pathway.

Question 2

How does temperature increase the rate of a chemical reaction

Answer 2

Temperature increases the rate of a chemical reaction by altering the kinetic energy of the particles. This increases the number of particles with sufficient activation energy whilst also increasing the number of collisions.

Question 3

Name the four factors that affect the rate of a chemical reaction

Answer 3

1. Presence of a catalyst
2. Surface area
3. Concentration
4. Temperature

Question 4

What is Collision Theory?

Answer 4

1. For a chemical reaction to occur, particle collision must occur.
2. Collisions must occur with sufficient activation energy and correct orientation.

Question 5

Acid + Metal Oxide =

Answer 5

Salt + Water

Question 6

Metal + Oxygen =

Answer 6

Metal oxide

Question 7

Non metal oxide + Water =

Answer 7

Acid

Question 8

Metal and water =

Answer 8

Metal hydroxide and hydrogen gas

Question 9

How does concentration affect the rate of reaction

Answer 9

1. Increasing particles per area
2. Because of this more collisions
3. More collisions = more succesfull collisions
4. This increases rate of reaction

Question 10

How does surface area affect rate of a reaction

Answer 10

1. Increasing surface area increases the amount of particles accessible to react
2. This increases number of collisions which increases rate of reaction

Question 11

What is Oxidation

Answer 11

Oxidation is when any element loses its electrons

Question 12

What is reduction

Answer 12

Reduction is when any element gains its electrons