Chemical Reactions ETT

Question 1

What type of reaction is shown below?

methane + oxygen → carbon dioxide + water

Answer 1

Combustion

Question 2

Complete this thermal decomposition reaction.

Copper carbonate → ____________________ + _________________

Answer 2

copper oxide + carbon dioxide

Question 3

Complete the equation:

hydrogen + oxygen → ___________

Answer 3

water

Question 4

In the reaction below, what are the reactants?

methane + oxygen → carbon dioxide + water

Answer 4

Methane + Oxygen

Question 5

In the reaction below, what are the products?

methane + oxygen → carbon dioxide + water

Answer 5

carbon dioxide and water

Question 6

Give an example of a physical change that is not a chemical reaction

Answer 6

• Change of state (e.g. melting, boiling e.t.c)
• Dissolving

Question 7

Name the poisonous gas released in incomplete combustion

Answer 7

carbon monoxide

Question 8

What type of combustion occurs when there is not enough oxygen present?

Answer 8

Incomplete combustion

Question 9

What are the products of combustion?

Answer 9

Carbon dioxide and water

Question 10

What are the chemicals that are reacted together in a chemical reaction called?

Answer 10

Reactants

Question 11

What are the products of incomplete combustion?

Answer 11

carbon monoxide + carbon + water

Question 12

Give five ways in which you know a chemical reaction has occurred.

Answer 12

• Smell
• Temperature change
• Fizzing
• Solid produced
• Colour change

Question 13

What name is given to a substance that speeds up a reaction?

Answer 13

Catalyst

Question 14

Name the reaction when heat breaks down a compound

Answer 14

Thermal decomposition

Question 15

Where does the oxygen for combustion come from?

Answer 15

The air

Question 16

Complete the combustion equation:

propane + oxygen → _____________ + _____________

Answer 16

carbon dioxide + water

Question 17

What are the chemicals that are produced in a chemical reaction called?

Answer 17

Products

Question 18

What two elements are in methane, CH₄?

Answer 18

Carbon and hydrogen

Question 19

What is a reaction called when a substance reacts with oxygen?

Answer 19

Oxidation

Question 20

What environmental problem does releasing carbon dioxide cause?

Answer 20

Global warming

Question 21

What name is given to a reaction that releases heat energy?

Answer 21

Exothermic

Question 22

What name is given to a reaction that takes in heat energy?

Answer 22

Endothermic

Question 23

What will happen to the temperature of the surroundings in an exothermic reaction?

Answer 23

Heat up

Question 24

What will happen to the temperature of the surroundings in an endothermic reaction?

Answer 24

Cool down

Question 25

Is combustion exothermic or endothermic?

Answer 25

Exothermic

Question 26

Is thermal decomposition exothermic or endothermic?

Answer 26

Endothermic

Question 27

What type of reaction does a sports injury pack use?

Answer 27

Endothermic

Question 28

What type of reaction does a hand warmer use?

Answer 28

Exothermic

Question 29

What is the conservation of mass?

Answer 29

Mass of reactants = Mass of products

Question 30

methane + oxygen → carbon dioxide + water If 16 g of methane reacts with 64 g of oxygen, 44 g of carbon dioxide is made. How much water is made?

Answer 30

36 g | (because of the conservation of mass)

Question 31

Name the three acids you commonly use in the lab beginning with the following letters: 1. H 2. N 3. S

Answer 31

1. Hydrochloric acid 2. Nitric acid 3. Sulfuric acid

Question 32

Are soaps and toothpaste acidic or alkali?

Answer 32

Alkali

Question 33

Are vinegar and lemons acids or alkalis?

Answer 33

Acids

Question 34

Name the indicator used with the pH scale

Answer 34

universal indicator

Question 35

What is the range of the pH scale?

Answer 35

from 0 to 14

Question 36

Universal indicator is added to a neutral solution. What colour would it turn?

Answer 36

Green

Question 37

Universal indicator is added to a solution and it turns red. What does that tell you about the solution?

Answer 37

It's acidic

Question 38

Universal indicator is added to a solution and it turns orange. What does that tell you about the solution?

Answer 38

It's acidic

Question 39

Universal indicator is added to a solution and it turns yellow. What does that tell you about the solution?

Answer 39

It's acidic

Question 40

Universal indicator is added to a solution and it turns purple. What does that tell you about the solution?

Answer 40

It's alkaline

Question 41

What type of reaction is shown below? hydrochloric acid + sodium hydroxide → sodium chloride + water

Answer 41

neutralisation

Question 42

What is a soluble base called?

Answer 42

An alkali

Question 43

What is the reaction called when an acid is added to an alkali?

Answer 43

Neutralisation

Question 44

Name the salt produced in the equation below: hydrochloric acid + sodium hydroxide → sodium chloride + water

Answer 44

sodium chloride

Question 45

Name the acid that makes salts called sulfates

Answer 45

sulfuric acid

Question 46

Name the acid that makes salts called nitrates

Answer 46

nitric acid

Question 47

Name the acid that makes salts called chlorides

Answer 47

hydrochloric acid

Question 48

Complete the following equation: copper oxide + hydrochloric acid →

Answer 48

copper chloride + water

Question 49

List the steps involved in making copper sulfate crystals.

Answer 49

1. Add copper oxide in excess to sulfuric acid 2. Filter 3. Pour copper sulfate solution into an evaporating basin and heat until most of the water evaporates 4. Leave in a warm place to allow the rest of the water to evaporate

Question 50

Is a solution with a pH between 0 and 6 an acid or an alkali?

Answer 50

acid

Question 51

Is a solution with a pH between 8 and 14 an acid or an alkali?

Answer 51

alkali

Question 52

Which is a stronger acid, pH 2 or pH 6?

Answer 52

pH 2

Question 53

What does the hazard symbol in the image mean?

Answer 53

Moderate hazard

Question 54

What does the hazard symbol in the image mean?

Answer 54

Corrosive

Question 55

What does the hazard symbol in the image mean?

Answer 55

Flammable

Question 56

What does the hazard symbol in the image mean?

Answer 56

Hazardous to aquatic environments

Question 57

What does the hazard symbol in the image mean?

Answer 57

Toxic

Question 58

What does the hazard symbol in the image mean?

Answer 58

Hazardous to health