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Year 7 > Chemical Reactions ETT > Flashcards

Chemical Reactions ETT Flashcards

1
Q

What type of reaction is shown below?

methane + oxygen → carbon dioxide + water

A

Combustion

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2
Q

Complete this thermal decomposition reaction.

Copper carbonate → ____________________ + _________________

A

copper oxide + carbon dioxide

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3
Q

Complete the equation:

hydrogen + oxygen → ___________

A

water

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4
Q

In the reaction below, what are the reactants?

methane + oxygen → carbon dioxide + water

A

Methane + Oxygen

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5
Q

In the reaction below, what are the products?

methane + oxygen → carbon dioxide + water

A

carbon dioxide and water

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6
Q

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

A
  • Change of state (e.g. melting, boiling e.t.c)
  • Dissolving
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7
Q

Name the poisonous gas released in incomplete combustion

A

carbon monoxide

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8
Q

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

A

Incomplete combustion

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9
Q

What are the products of combustion?

A

Carbon dioxide and water

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10
Q

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

A

Reactants

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11
Q

What are the products of incomplete combustion?

A

carbon monoxide + carbon + water

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12
Q

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

A
  • Smell
  • Temperature change
  • Fizzing
  • Solid produced
  • Colour change
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13
Q

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

A

Catalyst

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14
Q

Name the reaction when heat breaks down a compound

A

Thermal decomposition

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15
Q

Where does the oxygen for combustion come from?

A

The air

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16
Q

Complete the combustion equation:

propane + oxygen → _____________ + _____________

A

carbon dioxide + water

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17
Q

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

A

Products

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18
Q

What two elements are in methane, CH4?

A

Carbon and hydrogen

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19
Q

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

A

Oxidation

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20
Q

What environmental problem does releasing carbon dioxide cause?

A

Global warming

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21
Q

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

A

Exothermic

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22
Q

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

A

Endothermic

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23
Q

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

A

Heat up

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24
Q

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

A

Cool down

25
Q

Is combustion exothermic or endothermic?

A

Exothermic

26
Q

Is thermal decomposition exothermic or endothermic?

A

Endothermic

27
Q

What type of reaction does a sports injury pack use?

A

Endothermic

28
Q

What type of reaction does a hand warmer use?

A

Exothermic

29
Q

What is the conservation of mass?

A

Mass of reactants = Mass of products

30
Q

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?

A

36 g

(because of the conservation of mass)

31
Q

Name the three acids you commonly use in the lab beginning with the following letters:

  1. H
  2. N
  3. S
A
  1. Hydrochloric acid
  2. Nitric acid
  3. Sulfuric acid
32
Q

Are soaps and toothpaste acidic or alkali?

A

Alkali

33
Q

Are vinegar and lemons acids or alkalis?

A

Acids

34
Q

Name the indicator used with the pH scale

A

universal indicator

35
Q

What is the range of the pH scale?

A

from 0 to 14

36
Q

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

A

Green

37
Q

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

A

It’s acidic

38
Q

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

A

It’s acidic

39
Q

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

A

It’s acidic

40
Q

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

A

It’s alkaline

41
Q

What type of reaction is shown below?

hydrochloric acid + sodium hydroxide → sodium chloride + water

A

neutralisation

42
Q

What is a soluble base called?

A

An alkali

43
Q

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

A

Neutralisation

44
Q

Name the salt produced in the equation below:

hydrochloric acid + sodium hydroxide → sodium chloride + water

A

sodium chloride

45
Q

Name the acid that makes salts called sulfates

A

sulfuric acid

46
Q

Name the acid that makes salts called nitrates

A

nitric acid

47
Q

Name the acid that makes salts called chlorides

A

hydrochloric acid

48
Q

Complete the following equation:

copper oxide + hydrochloric acid →

A

copper chloride + water

49
Q

List the steps involved in making copper sulfate crystals.

A
  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
50
Q

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

A

acid

51
Q

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

A

alkali

52
Q

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

A

pH 2

53
Q

What does the hazard symbol in the image mean?

A

Moderate hazard

54
Q

What does the hazard symbol in the image mean?

A

Corrosive

55
Q

What does the hazard symbol in the image mean?

A

Flammable

56
Q

What does the hazard symbol in the image mean?

A

Hazardous to aquatic environments

57
Q

What does the hazard symbol in the image mean?

A

Toxic

58
Q

What does the hazard symbol in the image mean?

A

Hazardous to health

Year 7 (12 decks)

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