Chemical Reactions

Question 1

Chemical Reaction

Answer 1

when the particles of reactants collide with sufficient activation energy to create a whole new substance with a new set of properties

Question 2

acid + base

Answer 2

salt + water

Question 3

acid + metal

Answer 3

salt + hydrogen gas

Question 4

Air consists of…

Answer 4

Nitrogen (78%)
Oxygen (21%)
Argon ( <1%)
Carbon Dioxide (0.03%)
Water Vapour (0.4%)

Question 5

Carbon Dioxide Properties

Answer 5

Gas
Colourless
Acidic
Odourless
Heavier than air

Question 6

Test for Carbon Dioxide

Answer 6

carbon dioxide turns limewater from clear to milky

Question 7

Baking Soda + Vinegar

Answer 7

Gas

Question 8

Catalyst

Answer 8

alters the rate of a reaction without being used up in the reaction

Question 9

Oxygen Properties

Answer 9

Gas
Colourless
Odourless
Tasteless
Neutral
Supports Combustion

Question 10

Test for Oxygen

Answer 10

a glowing splint relights

Question 11

Enzymes

Answer 11

biological catalysts

Question 12

How do catalysts alter the rate of reaction?

Answer 12

they lower the activation energy

Question 13

biochemical reaction

Answer 13

a chemical reaction taking place inside living cells

Question 14

What factors affect the efficiency of enzymes?

Answer 14

temperature, pH and concentration

Question 15

Rate of Reaction

Answer 15

the change in concentration per unit time of any one reactant or product

Question 16

Factors affecting the rate of reaction

Answer 16

1. types of reactants
2. particle size
3. concentration
4. temperature
5. catalysts

Question 17

Nature of Reactants

Answer 17

Some bonds are easier to break or form than others

Question 18

Particle Size

Answer 18

The more finely divided a solid, the greater the surface area exposed, the faster the reaction.

Question 19

Conditions needed for a dust explosion to occur

Answer 19

1. Combustible dust particles
2. Source of ignition
3. Dryness
4. Sufficient Oxygen
5. Enclosed spaces

Question 20

Concentration

Answer 20

With greater concentration, there is a greater number of particles which collide more often and the rate of reaction is faster

Question 21

Temperature

Answer 21

The higher the temperature the faster the rate of reaction. - As temperature increases, particles have more energy therefore they will move around and collide more often.

Question 22

Example of biochemical reactions

Answer 22

1. Photosynthesis
2. Respiration
3. Digestion

Question 23

Activation Energy

Answer 23

The minimum energy that colliding particles must have for a reaction to occur

Question 24

Effective Collision

Answer 24

The collision of reactants which results in the formation of products

Question 25

Reaction profile diagrams

Answer 25

graphs which show the change in energy of a chemical reaction with time as the reaction progresses

Question 26

Draw an endothermic reaction profile diagram and give three examples

Answer 26

-

Question 27

Draw an exothermic reaction profile diagram and give three examples

Answer 27

-

Question 28

Draw, label and explain a diagram to prepare carbon dioxide gas

Answer 28

-

Question 29

Draw, label and explain a diagram to prepare oxygen

Answer 29

-

Question 30

test for hydrogen gas

Answer 30

waxy taper burns with a pop