C5 Chemicals of the Natural Environment
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Question overview
Question / Topic / Mark / % / Grade / DateC5a / Simple molecular / /11
C5b / Giant covalent / /13
C5c / Relative formula masses / /3
C5d / Metallic bonding / /1
C5e / Methods of extraction / /5
C5g / Testing for ions / /6
C5hsw / How science works / /11
C5calc / Calculations / Mathematics / /9
Colour code each subtopic using pencils, on target = orange, above = green, below = red.
C5a13Jan6abc
Read the information about the atmosphere of some planets.
Using the gases named in the information, complete the table. [3]
The atmospheres contain molecular substances.What are the properties of molecular substances?
Put ticks next to the two correct answers.
They do not conduct electricity.
They all have boiling points above room temperature.
They form crystals at room temperature.
They have low melting points.
They are hard and strong.[2]
The atoms in a hydrogen molecule are held together by a covalent bond.Which statements are true for the hydrogen molecule? Put ticks next to the two correct answers.
The nuclei of the two atoms are attracted together.
Electrons are attracted together to form a bond.
The nuclei of the two atoms repel each other.
The nucleus of each atom attracts the shared electrons.
The electrons repel the nuclei away from each other. [2]
C5a 12Jun5b
Which of the following statements about gases in the air are true?
Put ticksnext to the two correct statements.
All of the gases in the air are elements.
Air contains only non-metal elements.
There are weak attractions between molecules in air.
All the gases have high melting points and boiling points.
The gases are good conductors of electricity.
C5a12Jun5c
Molecules in the air contain atoms that are held together by strong covalent bonds.
Which of the following statements are the best descriptions of covalent bonds in thesemolecules?
Put ticks next to the two best answers.
A covalent bond is made by sharing electrons.
The atoms gain positive or negative charges when the bond is made.
The atoms are held together by the attractions between the nuclei of the
atoms and the electrons between them.
Each atom is surrounded by a sea of electrons that can move.
The atoms are bonded covalently into large, three dimensional structures.
C5b13Jan4
Sam does some research about the properties of diamond and graphite.
The table shows what he finds out.
Sam notices that some of the properties are similar and some are different.
He finds diagrams that show the structures of diamond and graphite.
The table shows some similarities and differences in the properties of diamond and graphite.
Use ideas about their structures to explain these similarities and differences.
The quality of written communication will be assessed in your answer.
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C5b13Jun5a+b
Carbon dioxide and silicon dioxide are compounds that occur naturally on Earth.
The table shows some information about the two compounds.
Use ideas about structure and bonding to explain the similarities and differences between theproperties of carbon dioxide and silicon dioxide.
The quality of written communication will be assessed in your answer.
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Which statement about where carbon dioxide and silicon dioxide are found is correct?
Put a tick next to the correct answer.
They are both found in the atmosphere.
Silicon dioxide is only found in the hydrosphere, carbon dioxide is onlyfound in the lithosphere.
Both carbon dioxide and silicon dioxide are only found in the lithosphere.
Carbon dioxide is found in the atmosphere, silicon dioxide is found in the lithosphere.[1]
C5c12Jun7a
Jed and Kay live near a lead mine.
The mineral massicot is dug out of this mine.
Massicot contains lead oxide, PbO.
Lead metal can be extracted from massicot by heating it with carbon.
2PbO + C 2Pb + CO2
What is the maximum mass of lead that can be extracted from 446 g of lead oxide?
Use the Periodic Table to find the relative atomic masses.
Start by working out the relative formula mass of lead oxide.
Relative formula mass of lead oxide, PbO= ......
Mass of lead that can be extracted from 446 g lead oxide = ...... g[3]
C5d13Jun6a
Aluminium is a metal with a low density and a high electrical conductivity.
It is used to make overhead power cables. The diagram shows the bonding in a metal.
What does the symbol represent?
Put a tick next to the best answer.
1)protons from metal atoms
2)positively charged metal ions
3)the nucleus of a metal atom
4)the positive metal electrode
C5e13Jun6b+c
Aluminium is extracted by electrolysis of molten aluminium oxide.
Complete and balance the ionic equations to show what happens during the electrolysis ofmolten aluminium oxide.
[2]
Aluminium is a metal but aluminium oxide is an ionic compound.
Aluminium metal and molten aluminium oxide conduct electricity in different ways.
Describe and explain the differences.
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C5g 12Jun6
Amy and Zak test samples of the same solution.
Test / ResultAdd a few drops
of dilute sodium
hydroxide. / white precipitate
Acidify and add
dilute silver
nitrate. / white precipitate
Acidify and add
dilute barium
chloride. / white precipitate
Conclusion The solution contains a mixture ofcalcium sulfate and calcium chloride.
Test / Result
Add a few drops
of dilute sodium
hydroxide…
…then add more
dilute sodium
hydroxide. / white precipitate
precipitate
dissolves
Acidify and add
dilute silver
nitrate. / white precipitate
Conclusion Thesolution only contains zinc chloride.
Amy’s resultsZak’s results
They do tests to identify the positive metal ions and the negative ions in the solution.
They use a fresh sample for each test.
The boxes show the tests they use and their results.
Amy and Zak’s teacher tells them that neither of their conclusions are fully correct.
Look at Amy and Zak’s tests and their results.
Explain why neither Amy or Zak has a fully correct conclusion.
Identify the correct metal and non-metal ions in the solution.
The quality of written communication will be assessed in your answer.
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C5hsw12Jun7bi
The lead mine produces millions of tonnes of lead ore.
Jed and Kay are talking about the advantages and disadvantages of living near the lead mine.The lead mine affects the surrounding area because they haveto blast out 10 tonnes of rock to get less than a tonne of lead ore.
(i) Kay has just moved into the area. She has a young family.
Give one advantage and one disadvantage to Kay of living near a lead mine.
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(ii) Jed and Kay talk about lead processing at the mine.
Suggest reasons that Kay could give for not closing the mine.
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C5hsw13Jan5b
The minerals are transported from the mine to be processed to make copper.
Zoe thinks about the environmental harm caused by transporting each mineral.
Do you agree with Zoe?
Explain your answer.
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C5hsw13Jun4a
Joe knows that ‘hard’ water contains dissolved calcium ions.
Joe does some research about the concentration of calcium ions in ‘hard’ water.
He also finds out the concentration of calcium ions in water from different places.
What conclusions can Joe make from the data in the two tables?
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C5hsw13Jun4biv
Joe uses the same technique to analyse a sample of water from London.
He finds that the sample contains 450 mg / dm3 of dissolved solid.
Joe’s research found that London water contains 160 mg / dm3 of calcium ions.
Why are the two values different?
Put a tick next to the best answer.
Joe overheated the solid so that it decomposed.
The water contained ions other than calcium.
Joe used too small a volume of water in his experiment.
The relative atomic mass of calcium is higher than Joe realised.[1]
C5calc13Jan5ai+ii
Zoe works for a mining company. The company extracts copper from two different minerals.
They use the minerals cuprite, Cu2O, and chalcocite Cu2S.
Zoe works out the percentage mass of copper in cuprite. It is 88.8%.
She uses this formula:
Calculate the percentage mass of copper in chalcocite, Cu2S.
Give your answer to three significant figures.
...... % [3]
Use your answer to work out how much copper can be extracted from 1 kg of purechalcocite.
...... kg [1]
C5calc13Jun4bii+ii
(a) The table shows Joe’s results.
Calculate the amount of solid in 1 dm3of water. Give your answer in g / dm3.(1 dm3 = 1000 cm3)
...... g / dm3[2]
(b) Use your answer to work out the number of milligrams (mg) of solid in 1 dm3 of water. (1 g = 1000 mg)
...... mg / dm3[1]