Year 8 Chemistry. Pre-Test Revision Questions
1. Tick the correct box to complete the sentence. The elements in the Periodic Table are arranging in
order of increasing:
[1]
□
□
□
□
Number of atoms
Neutron number
Relative atomic mass
Atomic number
2. State the number of protons, electrons and neutrons in an atom of Na [3]
Protons:
____________________________
Electrons: ____________________________
Neutrons: ____________________________
3. Complete the table to show the relative masses, charge and location of the three sub atomic particles.
[3]
Particle
Relative Mass
Proton
1
Electron
Charge
Location
Negative
Neutral
Nucleus
4. Why does an atom of sodium have no overall charge? [1]
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5. Draw a diagram to show the electron arrangement of an ATOM of sodium. [1]
6. Draw a diagram to show the electron arrangement of an ION of sodium. Ensure you include the
charge. [2]
7. Sodium, lithium and potassium all have similar chemical properties. Explain by referring to the
electron arrangement, why elements in the same group of the periodic table have similar chemical
properties.
[1]
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8. Group one metals will react with water. State 2 observations you could make when the following Group
one metals are added to water: [6]
a) Potassium
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b) Sodium
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c) Lithium
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d) Write a balanced chemical equation for the reaction between potassium and water. [2]
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e) Which product of the reaction is an alkali and therefore will turn universal indicator solution
blue? [1]
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9. Sodium can react with different elements to form a variety of compounds. One compound is sodium
sulphate, which has the formula Na2SO4
i) How many different atoms are present in Na2SO4
ii) What is the total number of atoms in Na2SO4
______________________________ [1]
______________________________
[1]
10. Elements can exist in three different states of matter.
a) Complete the diagrams in the boxes to show the arrangement of particles when the substance is a
solid, liquid and a gas. [6]
SOLID
LIQUID
GAS
b) Which state will have the highest density of particles? Explain your answer
[2]
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11. Use your periodic table and data sheet. Write the formula of the following compounds. Remember,
compounds are electrically neutral. (The combining powers/valencies of the ions must cancel to 0) [5]
a) calcium oxide
___________________________
b) lithium phosphide
___________________________
c) magnesium fluoride
___________________________
d) sodium carbonate
___________________________
e) Lithium oxide
___________________________
12. A small amount of calcium oxide is dissolved in water. When universal indicator is added to the
solution, the indicator turns blue. What does the observation with the indicator show about calcium
oxide?
[1]
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13. When calcium oxide is added to water, heat energy is released and the temperature of the
surroundings increases. What is the name given to this type of reaction? [1]
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14. The reactivity of metals can be studied using displacement reactions. In these reactions, one metal
is added to a solution of a salt of a different metal.
 If a displacement reaction occurs, there is a temperature rise.
A student used the following method in a series of experiments.



Pour some metal salt solution into a polystyrene cup supported in a glass beaker and record the
temperature of the solution
Add a known mass of a metal and stir
Record the maximum temperature of the mixture
a) The student used a thermometer to measure the temperature rise. The diagrams show the
thermometer readings before and after adding the metal.
Use the diagrams to complete the table.



[3]
The student used copper sulphate solution in all her experiments.
She used five different metals. She did not know the identity of the metal labelled ‘X’
The student did each experiment twice. The table shows her results.
b) Which of the metals gave the least reliable temperature rise? Explain your choice.
Metal:
[2]
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Explanation:
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c) Identify the most reactive of the metals used. Explain how the results show that it is the most
reactive [2]
Metal:
__________________________________________
Explanation:
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d) Why is there no temperature rise when silver is added to copper sulphate solution?
[2]
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e) Why do the results make it impossible to decide which of the metals is the least reactive?
[1]
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f) A word equation for one of the reactions is:
zinc + copper sulphate  copper + zinc sulphate
Write a chemical equation for this reaction
[2]
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15. Like other metals, iron is malleable, ductile, has a high melting point and is a good conductor of
electricity.
a) Draw a labelled diagram to show the bonding in iron metal.[2] (include the key terms: delocalised
electrons and positive ions)
b) What is meant by the term ‘malleable’? [1]
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c) Explain why iron is a good conductor of electricity. [2]
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d) Explain why iron is ductile. [2]
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16. Write a chemical equation for the following ‘MASH’ reactions: [2]
a) Magnesium + Sulphuric Acid  Magnesium Sulphate + Hydrogen
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b) Iron + Hydrochloric Acid  Iron Chloride + Hydrogen (the formula for Iron Chloride is FeCl2)
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17.
a) Complete the paragraph, using the words in bold
electricity
iron
compound
elements
[5]
bromine
Electrolysis is the splitting up of a _______________ into its ________________ using
__________________ . In the electrolysis of iron bromide solution, pure ____________ and
_____________ is produced.
b) What is the name of FeBr2?
[1]
______________________________________
c) What ions are present in FeBr2? [1]
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d) Complete the half equations to show what is happening to the ions during the electrolysis of
FeBr2 [2]
Fe2+ + ____  Fe
____ - 2e  Br2
e) Which of the reactions in d) shows oxidation? Explain your answer. (think OIL RIG) [2]
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