Globe Academy Science Department
GCSE Additional Science
Homework Booklet Spring 1
Contents:
Topic
1
Chemistry Revision
2
Energy in
Reactions
3
Making Salts
4
Electrolysis
5
Forces
6
Work and Power
Date
Set
Date Feedback/
Due Marking
Name: ______________________________________
Homework 1: Chemistry Revision QUESTION PAGE:
C3
C2
C1
B1
A1
A*
• What are ionic and covalent bonds? For
each one say when they happen.
• Explain why metals are good conductors of
electricity. Use the word delocalised in
your answer.
• Describe and explain the properties of
simple molecular compounds.
• Describe and explain the properties of ionic
compounds.
• Explain how to calculate the empirical
formula of something. Explain using an
example.
• Explain how to do the reacting masses
calculation. Explain using an example.
ANSWER PAGE:
C3
C2
C1
B1
A1
A*
Homework 2: Energy in Reactions
When the ESA (European Space Agency) launches satellites and space probes, the rockets are fuelled
by hydrogen and oxygen, which makes water. The reaction between these two chemicals produces
enough energy for the rocket to reach space.
You are the safety director for the ESA’s fuel plant. You have been asked to produce a safety and
science briefing for new staff, explaining
GRADE
WHAT YOU NEED TO DO
F
State how you can tell whether a reaction is exothermic or endothermic using simple
lab equipment.
E
Give definitions for exothermic and endothermic reactions.
D
Describe some examples of exothermic and endothermic reactions, referring to
named reactions.
Write a word equation for the reaction between hydrogen and oxygen
C
Write a balanced symbol equation with state symbols for the reaction between
hydrogen and oxygen.
B
Explain why this reaction is exothermic by referring to bond energies.
A
For a reaction of your choice, demonstrate the bonds that are broken and made and
use this to explain whether the reaction will be endothermic or exothermic.
BOND ENERGIES
H 2O
928 kJ/mol
H2
436 kJ/mol
O2
498 kJ/mol
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Homework 3: Making Salts (Oxides, Hydroxides and Ammonia)
Hint: You’ll need to use some of
these symbols H2O water
H2 hydrogen
HCl hydrochloric acid
CuOH copper hydroxide
ZnO zinc oxide
ZnOH zinc hydroxide
NaSO4 sodium sulfate
Homework 4: Electrolysis
Read the information about the electrolysis of brine (salt water, also called sodium chloride
solution) and then answer the questions carefully.
Electrolysis of brine
The process of electrolysis involves using an electric current to bring about a chemical change and make
new chemicals. The electrolysis of salt water is a large-scale process used to manufacture chlorine from
salt. Two other useful chemicals are obtained during the process, sodium hydroxide (NaOH) and hydrogen
(H2).
Uses in industry
Product
Uses of the chemical
chlorine
disinfectant and purifier
manufacture of hydrochloric acid
making plastics
sodium hydroxide
processing food products
removing pollutants from water
manufacture of paper
hydrogen
manufacture of hydrochloric acid
potential as a pollution-free fuel
Environmental impacts of the electrolysis of brine on a large scale must be considered. The process uses a
lot of electricity that is mainly produced by the burning of fossil fuels. During the actual process of
electrolysis, metal must be in contact with the solution of brine. A metal commonly used is mercury which
is toxic. Some mercury escapes into the solution and into the environment.
1. Match up the word with its meaning.
Manufacturing
Electrolysis
Brine
Large scale process
Splitting up using electricity
Making
Salt water
Chemical reactions happening
in a big factory
2. Name three products made in the electrolysis of salt water
and explain their uses.
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3. Analyse the advantages and disadvantages of electrolysis of
salt water. Use linking words from the box:
However
Whereas
In contrast
hand Therefore
Overall
On the other
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Homework 5: Forces
Explain what you have learnt so far about forces using the success
criteria.
Grade
D
C
B
A
A*
Success Criteria
Give a definition for a force.
Name three forces and describe where they are found.
Describe what a resultant force is and what happens to
an object if it is unbalanced.
Give the equation for relating force and extension for a
spring. Explain how to use it and the units for each thing.
Explain how to calculate the spring constant of a spring
using a graph showing its extension at different forces.
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Homework 6: Work and Power
Pick the 6 calculations to complete. You can choose to do easy, medium or hard.
EASY
1 Calculate the work
done by a 47 N force
pushing a pencil 0.26
m.
2 A car uses 2,500
Joules in 25 seconds.
Find power.
MEDIUM
4 How much power
does it take to lift 30 N
10m high in 5 s?
HARD
7 How much work can
a 22 kW car engine do
in 60. s if it is 100%
efficient?
5 You do 45 J of work
in 3.0 seconds. How
much power do you
use?
8 If a small motor does
520. J of work to move
a toy car 260 m, what
force does it exert?
3 Calculate the work
done by a 2.4 N force
to move a sandwich
across a table 0.75 m
wide.
6 You use 35 J of
energy to move a 7.0 N
object. How far did you
move it?
9 A 60 watt light bulb
runs for 5.0 seconds.
How much energy does
it use?
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