3
GCSE
Chemistry B Twenty First Century Science
J258/01: Breadth in Chemistry (Foundation Tier)
General Certificate of Secondary Education
Mark Scheme for June 2024
C
LE
ST
BE
© OCR 2024 Turn over
, 2
Fuels such as diesel and petrol are made from hydrocarbons.
(a)
(i) Hydrocarbons are made from carbon and one other element.
What is the other element?
Put a ring around the correct option.
Chlorine Hydrogen Nitrogen Oxygen
[1]
(ii) What is the main source of hydrocarbons?
. ....................................................................................................................................................... [1]
(b) Alkanes are hydrocarbons.
Which compound is an alkane?
C
Tick (✓) one box.
LE
Butanoic acid
Ethanol
Methane
ST
Propene
[1]
(c) Alkenes are also hydrocarbons. They can be used to make polymers.
BE
Which statements about polymers are true and which are false?
Tick (✓) one box in each row.
True False
All polymers are made from alkenes.
Polymers are long chain molecules.
Polymers can be synthetic or naturally occurring.
[2]
© OCR 2024
, 3
(d) Ethene is the monomer used to make a polymer called poly(ethene).
Fig. 1.1 shows the structure of ethene.
Fig. 1.1
H H
C C
H H
(i) Complete the diagram below to show the repeating unit of poly(ethene).
C C
C
[2]
LE
(ii) Describe what happens when ethene monomers react together to form poly(ethene).
..........................................................................................................................................................
ST
..........................................................................................................................................................
..........................................................................................................................................................
. ....................................................................................................................................................... [2]
BE
© OCR 2024 Turn over
, 4
2 Lithium is an element in Group 1 of the Periodic Table.
(a)
(i) Describe one physical property of lithium.
..........................................................................................................................................................
. ....................................................................................................................................................... [1]
(ii) Complete the diagram to show the arrangement of electrons in an atom of lithium.
Use the Periodic Table.
Li
C
LE
[2]
(b) Lithium reacts with water to form an alkaline solution and hydrogen gas.
ST
Complete the word equation and balanced symbol equation for the reaction.
Include state symbols on the symbol equation.
BE
lithium + water .......................................... + hydrogen
2Li(s) + 2..........(l) 2LiOH(..........) +............. (g)
[4]
© OCR 2024
GCSE
Chemistry B Twenty First Century Science
J258/01: Breadth in Chemistry (Foundation Tier)
General Certificate of Secondary Education
Mark Scheme for June 2024
C
LE
ST
BE
© OCR 2024 Turn over
, 2
Fuels such as diesel and petrol are made from hydrocarbons.
(a)
(i) Hydrocarbons are made from carbon and one other element.
What is the other element?
Put a ring around the correct option.
Chlorine Hydrogen Nitrogen Oxygen
[1]
(ii) What is the main source of hydrocarbons?
. ....................................................................................................................................................... [1]
(b) Alkanes are hydrocarbons.
Which compound is an alkane?
C
Tick (✓) one box.
LE
Butanoic acid
Ethanol
Methane
ST
Propene
[1]
(c) Alkenes are also hydrocarbons. They can be used to make polymers.
BE
Which statements about polymers are true and which are false?
Tick (✓) one box in each row.
True False
All polymers are made from alkenes.
Polymers are long chain molecules.
Polymers can be synthetic or naturally occurring.
[2]
© OCR 2024
, 3
(d) Ethene is the monomer used to make a polymer called poly(ethene).
Fig. 1.1 shows the structure of ethene.
Fig. 1.1
H H
C C
H H
(i) Complete the diagram below to show the repeating unit of poly(ethene).
C C
C
[2]
LE
(ii) Describe what happens when ethene monomers react together to form poly(ethene).
..........................................................................................................................................................
ST
..........................................................................................................................................................
..........................................................................................................................................................
. ....................................................................................................................................................... [2]
BE
© OCR 2024 Turn over
, 4
2 Lithium is an element in Group 1 of the Periodic Table.
(a)
(i) Describe one physical property of lithium.
..........................................................................................................................................................
. ....................................................................................................................................................... [1]
(ii) Complete the diagram to show the arrangement of electrons in an atom of lithium.
Use the Periodic Table.
Li
C
LE
[2]
(b) Lithium reacts with water to form an alkaline solution and hydrogen gas.
ST
Complete the word equation and balanced symbol equation for the reaction.
Include state symbols on the symbol equation.
BE
lithium + water .......................................... + hydrogen
2Li(s) + 2..........(l) 2LiOH(..........) +............. (g)
[4]
© OCR 2024
