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Edexcel GCSE Combined Science (Chemistry) STANDARD > Topic 5 Mass calculations, electrolysis, metals and equilibria > Flashcards

Topic 5 Mass calculations, electrolysis, metals and equilibria Flashcards

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1
Q
  1. What is the formula of water?
A

H2O

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2
Q
  1. What is the formula of sodium chloride?
A

NaCl

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3
Q
  1. What is the formula of carbon dioxide?
A

CO2

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4
Q
  1. The formula of sulfuric acid is H2SO4. How many atoms of each element are in the formula?
A

(H = 2, S = 1, O = 4)

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5
Q
  1. Sodium chloride has the formula NaCl. The relative atomic mass of sodium is 23 and that of chlorine is 35.5. What is the relative formula mass of NaCl?
A

58.5

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6
Q
  1. The relative atomic mass of hydrogen is 1. What is the relative formula mass of hydrogen molecules?
A

2

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7
Q
  1. A water molecule has the formula H2O; the relative atomic mass of hydrogen is 1 and that of oxygen is 16. What is the relative formula mass of water?
A

18

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8
Q
  1. A carbon dioxide molecule has the formula CO2; the relative atomic mass of carbon is 12 and that of oxygen is 16. What is the relative formula mass of carbon dioxide?
A

44

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9
Q
  1. What is the empirical formula of a compound with molecular formula C2H4?
A

CH2

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10
Q
  1. What is the empirical formula of a compound with molecular formula C3H8?
A

C3H8

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11
Q
  1. A sample of magnesium carbonate was heated in an open test tube. Why did it lose mass?
A

gas/carbon dioxide escaped

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12
Q
  1. Why does magnesium increase in mass when it is heated in air?
A

combines with oxygen

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13
Q
  1. How many cm3 are there in 1 dm3?
A

1000

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14
Q
  1. 100 cm3 of a solution contains 1.5 g of salt. What is the concentration of the salt solution in g d3?
A

15

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15
Q
  1. What name is given to an atom that has gained or lost electrons?
A

ion

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16
Q
  1. What type of charge is on metal and hydrogen ions?
A

positive

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17
Q
  1. What type of charge is on most non-metal ions?
A

negative

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18
Q
  1. What is another name for a positive ion?
A

cation

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19
Q
  1. What is another name for a negative ion?
A

anion

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20
Q
  1. What is the symbol for a sodium ion?
A

Na+

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21
Q
  1. What is the symbol for a magnesium ion?
A

Mg2+

22
Q
  1. What is the symbol for a chloride ion?
A

Cl<span>-</span>

23
Q
  1. In what states do ionic compounds conduct electricity?
A

when molten or dissolved in water

24
Q
  1. What is the name of the positively charged electrode?
A

anode

25
Q
  1. What type of ions are attracted to the positively charged electrode?
A

anions / negative ions

26
Q
  1. What is the name of the negatively charged electrode?
A

cathode

27
Q
  1. What type of ions are attracted to the negatively charged electrode?
A

cations / positive ions

28
Q
  1. What is produced at the cathode when molten lead bromide is electrolysed?
A

lead

29
Q
  1. What gas is formed when magnesium is added to dilute sulfuric acid?
A

hydrogen

30
Q
  1. What would you see when magnesium is added to dilute sulfuric acid?
A

effervescence/fizzing/bubbles/magnesium disappears

31
Q
  1. Name a metal that does not react with water or dilute acids.
A

copper/silver/gold/platinum

32
Q
  1. What products are formed when zinc is added to copper sulfate solution?
A

zinc sulfate and copper

33
Q
  1. What type of reaction takes place when zinc is added to copper sulfate solution?
A

displacement

34
Q
  1. Name a metal that reacts vigorously with cold water.
A

potassium/sodium/rubidium/caesium/lithium/calcium

35
Q
  1. What gas is produced when a metal reacts with water?
A

hydrogen

36
Q
  1. How do you test for Hydrogen?
A

It pops a lighted splint.

37
Q
  1. Complete the word equation, magnesium + copper sulfate makes …
A

copper + magnesium sulfate

38
Q
  1. What type of reaction takes place when a substance loses oxygen?
A

reduction

39
Q
  1. Name a metal that occurs uncombined in the Earths crust.
A

gold/silver/platinum

40
Q
  1. Name a metal that could be extracted from its metal oxide by heating with carbon.
A

zinc/iron/copper

41
Q
  1. Name a metal, other than iron, that could be extracted from its metal oxide by heating with carbon.
A

zinc/copper

42
Q
  1. What type of reaction takes place when a metal is extracted from its ore?
A

reduction/redox

43
Q
  1. What type of reaction takes place when a metal corrodes?
A

oxidation/redox

44
Q
  1. What is the definition of oxidation, in terms of oxygen?
A

gain of oxygen

45
Q
  1. What is the specific name for the corrosion of iron?
A

rusting

46
Q
  1. Which of these metals will corrode most quickly - iron, sodium, copper?
A

sodium

47
Q
  1. Why does sodium corrode most quickly.
A

most reactive metal corrodes most quickly

48
Q
  1. What name is given to a process that converts an unwanted product into a new, useful product?
A

recycling

49
Q
  1. Name a type of substance that can be recycled.
A

metal, plastic, paper, cardboard, glass, etc.

50
Q
  1. What can happen in a reversible reaction?
A

the products can reform the reactants

51
Q
  1. What does the term equilibrium describe?
A

a position of balance

Edexcel GCSE Combined Science (Chemistry) STANDARD (8 decks)

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