Cambridge O Level · 5070 · Paper 2 · Theory

Chemistry 5070/21 May/June 2015 past paper

Cambridge O Level Chemistry (5070) Paper 2 (Theory), variant 1, May/June 2015: the question paper and its official mark scheme, 9 questions worth 85 marks, with the grade thresholds. Free to open, no account needed.

Questions: 9
Marks: 75
Grade A from: 54

Open the question paper Mark scheme

File names: 5070_s15_qp_21 · 5070_s15_ms_21

Grade thresholds for 5070/21 May/June 2015

The minimum raw marks Cambridge set for each grade on this component (out of 75). Thresholds change every session and variant, so always compare your score with the paper you actually sat.

A	B	C	D	E
54	39	28	22	16

Topics in this paper

Which syllabus chapters 5070/21 May/June 2015 tested, by marks. Each chapter links to every past-paper question on it.

Chapter	Questions	Marks
Stoichiometry	2	18
Acids, bases and salts	2	14
Atoms, elements and compounds	1	12
Chemical reactions	1	11
Electrochemistry	1	10
Metals	1	10
Organic chemistry	1	10

Questions in 5070/21 May/June 2015

Question 1Acids, bases and salts · 5 marks
A1 Choose from the following organic compounds to answer the questions below. butane butanoic acid butyl ethanoate ethanol ethyl butanoate methane methanol methyl propanoate propane propanoic acid propanol Each compound can be used once, more than once or not at …
Question 2Acids, bases and salts · 9 marks
A2 Some calcium compounds are used by farmers. (a) Calcium hydroxide dissolves in water to form limewater. When carbon dioxide is bubbled through limewater, a white precipitate of calcium carbonate is formed. Construct the equation for this reaction. (b) Calcium …
Question 3Chemical reactions · 11 marks
A3 Ozone molecules are continually being broken down and formed in the upper atmosphere. (a) The equation shows one way in which ozone is formed in the upper atmosphere. …
Question 4Atoms, elements and compounds · 12 marks
A4 Two isotopes of sulfur are 32 16S and …
Question 5Stoichiometry · 8 marks
A5 The flow chart shows some reactions of copper(II) nitrate, Cu(NO3)2. black solid CuO(s) brown gas A colourless gas that relights a glowing splint B Cu(NO3)2(s) Cu(NO3)2(aq) reagent X heat strongly dissolve in water green ppt CuCO3(s) colourless gas C …
Question 6Electrochemistry · 10 marks
B6 An aqueous solution of ammonium nitrite, NH4NO2, decomposes when heated gently. NH4NO2(aq) …
Question 7Metals · 10 marks
B7 Molybdenum is a transition element. It is used to make steel that is extremely hard. Molybdenum can be manufactured by heating together molybdenum(VI) oxide, MoO3, and aluminium. (a) Construct the equation for this reaction. (b) Explain why this reaction …
Question 8Stoichiometry · 10 marks
B8 Large quantities of poly(chloroethene) are manufactured annually. The flow chart shows the steps involved in the manufacture of poly(chloroethene). crude oil ethene salt solution chlorine dichloroethane chloroethene poly(chloroethene) (a) Name the two processes used to manufacture ethene from crude …
Question 9Organic chemistry · 10 marks
B9 Alkanes are a homologous series of saturated hydrocarbons. The table shows information about some alkanes. alkane molecular formula melting point / °C boiling point / °C ethane …

Other Chemistry papers from May/June 2015

Questions students ask

Where can I get the 5070/21 May/June 2015 mark scheme?

Open the mark scheme above - it is the official Cambridge scheme for this exact paper (5070_s15_ms_21), and on a wide screen it sits beside the question you are reading.

What was the grade threshold for an A in 5070/21 May/June 2015?

54 marks out of 75, a C needed 28.

Which topics came up in 5070/21 May/June 2015?

Mostly Stoichiometry, Acids, bases and salts, Atoms, elements and compounds. The full list is in the table above.

Do I need an account to open 5070/21 May/June 2015?

No. Every paper opens for free without signing in. A free account also saves your pen marks and records your score against the grade thresholds.