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1[GCSE Chemistry]1 > Topic 6 Quantitative analysis, equilibrium, fuel cells > Flashcards

Topic 6 Quantitative analysis, equilibrium, fuel cells Flashcards

1
Q
  1. What is the relative formula mass of magnesium oxide, MgO?
A

40

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2
Q
  1. What is the relative formula mass of water, H2O?
A

18

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3
Q
  1. What is the relative formula mass of carbon dioxide, CO2?
A

44

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4
Q
  1. What is the relative formula mass of sulfuric acid, H2SO4?
A

98

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5
Q
  1. What is the empirical formula of a compound with molecular formula C2H6?
A

CH3

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6
Q
  1. What is the empirical formula of a compound with molecular formula C6H6?
A

CH

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7
Q
  1. H What is the mass of 1 mole of sodium chloride, NaCl?
A

58.5 g

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8
Q
  1. H What is the mass of 0.1 mole of sulfur dioxide, SO2?
A

6.4 g

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9
Q
  1. What mass of water should be formed when 2 g of hydrogen reacts with 16 g of oxygen?
A

18 g

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10
Q
  1. What mass of magnesium oxide should be formed when 2.4 g of magnesium reacts with 1.6 g of oxygen?
A

4.0 g

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11
Q
  1. What is meant by the actual yield?
A

the actual amount of product formed in a reaction

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12
Q
  1. What is meant by the theoretical yield?
A

the maximum mass of product calculated from the balanced equation

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13
Q
  1. What is the formula for calculating percentage yield?
A

(actual yield/theoretical yield) × 100%

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14
Q
  1. What is the percentage yield if the actual yield is 60 g and the theoretical yield is 100 g?
A

60%

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15
Q
  1. What is the percentage yield if the actual yield is 5.5 g and the theoretical yield is 10 g?
A

55%

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16
Q
  1. What is the percentage yield if the actual yield is 15 g and the theoretical yield is 20 g?
A

75%

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17
Q
  1. What is the percentage yield if the actual yield is 0.1 g and the theoretical yield is 0.5 g?
A

20%

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18
Q
  1. Give one reason why the actual yield is less than the theoretical yield.
A

incomplete reaction, practical losses or competing reactions

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19
Q
  1. What is the relative formula mass of calcium hydroxide, Ca(OH)2?
A

74

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20
Q
  1. What is the relative formula mass of magnesium nitrate, Mg(NO3)2?
A

148

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21
Q
  1. What is meant by a solute?
A

a substance that dissolves in a liquid

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22
Q
  1. What is meant by a solvent?
A

the liquid that dissolves the solute

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23
Q
  1. How many cm3 are there in 1 dm3?
A

1000

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24
Q
  1. What is the concentration, in g dm-3, of 100 cm3 of a solution containing 2 g of solute?
A

20 g dm-3

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25
Q
  1. What is the concentration, in g dm-3, of 500 cm3 of a solution containing 5 g of solute?
A

5 g dm-3

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26
Q
  1. What is the concentration, in g dm?3, of 250 cm3 of a solution containing 4 g of solute?
A

4 g dm-3

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27
Q
  1. What is the amount, in moles, of hydrochloric acid, HCl, in 36.5 g?
A

1 mol

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28
Q
  1. What is the amount, in moles, of sodium hydroxide, NaOH, in 20 g?
A

0.5 mol

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29
Q
  1. What is the concentration of hydrochloric acid, in mol dm-3, if the concentration is 36.5 g dm-3?
A

1 (mol dm-3)

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30
Q
  1. What is the concentration of sodium hydroxide in mol dm-3, if the concentration is 20 g dm-3?
A

(0.5 (mol dm-3))

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31
Q
  1. What are the two substances formed when an acid reacts with an alkali?
A

salt and water

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32
Q
  1. What type of reaction takes place when an acid reacts with an alkali?
A

neutralisation

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33
Q
  1. Is potassium hydroxide an acid, an alkali or a salt?
34
Q
  1. Is sodium sulfate an acid, an alkali or a salt?
35
Q
  1. What is used to show that a solution is acidic, alkaline or neutral?
A

an indicator

36
Q
  1. What colour is phenolphthalein in an acidic solution?
A

colourless

37
Q
  1. What colour is methyl orange in an alkaline solution?
38
Q
  1. What measuring instruments are used to measure the accurate volumes of acid and alkali in a titration?
A

burette and pipette

39
Q
  1. H How many moles of solute are there in 2 dm3 of 0.1 mol dm-3 hydrochloric acid?
40
Q
  1. H How many moles of solute are there in 100 cm3 of 0.1 mol dm-3 hydrochloric acid?
41
Q
  1. What is the abbreviation used for the mole, the unit for amount of substance?
42
Q
  1. How many particles are there in 1 mole of particles?
A

6.02 × 1023

43
Q
  1. The mass of 1 mole of carbon atoms is 12 g. What is the mass of 2 moles of carbon atoms?
44
Q
  1. 2 g of hydrogen gas contains 1 mole of hydrogen molecules. How many moles are there in 1 g of hydrogen molecules?
45
Q
  1. Each water molecule contains three atoms. How many moles of atoms are there in 2 moles of water molecules?
46
Q
  1. The relative formula mass of chlorine gas is 71. What is the mass of 1 mole of chlorine gas?
47
Q
  1. What happens to the volume of a gas if its pressure is increased but its temperature is kept the same?
A

volume decreases

48
Q
  1. What happens to the volume of a gas if its temperature is increased but its pressure is kept the same?
A

volume increases

49
Q
  1. What is 100 dm3 in cm3?
A

100 000 cm3

50
Q
  1. 0.5 mol of salt is dissolved in 2 dm3 of water. What is the concentration of the solution?
A

0.25 mol dm–3

51
Q
  1. What are the chemical symbols for the elements nitrogen, potassium and phosphorus?
52
Q
  1. What two gases react together to produce ammonia in the Haber process?
A

nitrogen, hydrogen

53
Q
  1. What temperature is used in the Haber process?
54
Q
  1. What pressure is used in the Haber process?
A

200 atmospheres

55
Q
  1. Why is iron used in the Haber process?
A

It is the catalyst/it makes the reaction go faster.

56
Q
  1. Is ammonium sulfate soluble or insoluble in water?
57
Q
  1. Name the acid needed to produce ammonium nitrate.
A

nitric acid

58
Q
  1. Name the acid needed to produce ammonium sulfate.
A

sulfuric acid

59
Q
  1. What method produces a solution containing only salt and water from an acid and alkali?
A

titration/neutralisation

60
Q
  1. There is only one product in the Haber process. What is the atom economy of the process?
61
Q
  1. Write down or describe the symbol used for reversible reactions.
A

double headed arrow

62
Q
  1. Do the reactions keep going when a reversible reaction reaches equilibrium?
63
Q
  1. Do the concentrations of the reacting substances change at equilibrium?
64
Q
  1. What compound is manufactured in the Haber process?
65
Q
  1. If the temperature is increased in a dynamic equilibrium, does the position move towards the endothermic reaction or towards the exothermic reaction?
A

towards the endothermic reaction

66
Q
  1. If the pressure is increased in a dynamic equilibrium involving gases, does the position move towards the fewest number of moles of gas?
67
Q
  1. Compared with the theoretical yield, is the actual yield of product usually less, the same or more?
68
Q
  1. What happens to the rate of a reaction if the temperature is increased?
A

it increases

69
Q
  1. What happens to the rate of a reaction if a suitable catalyst is added?
A

it increases

70
Q
  1. Does a catalyst get used up in the reaction it catalyses?
71
Q
  1. Which is more reactive, zinc or iron?
72
Q
  1. Name the ion released by acids when they dissolve in water.
A

hydrogen/H+

73
Q
  1. Name the product formed when hydrogen reacts with oxygen.
74
Q
  1. What charged particles move through the liquid during electrolysis?
75
Q
  1. In what type of reaction is energy transferred to the surroundings?
A

exothermic

76
Q
  1. What is the unit for electrical potential difference?
77
Q
  1. In electrolysis, what do we call the ionic compounds that are decomposed?
A

electrolytes

78
Q
  1. What is the approximate voltage of a typical AA battery?
79
Q
  1. What fuel is used in a hydrogen–oxygen fuel cell?
80
Q
  1. What is oxidation?
A

reaction with oxygen/gain of oxygen/loss of electrons

1[GCSE Chemistry]1 (35 decks)

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