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Question 1
A student is identifying metal ions through flame tests. |
a) | Describe how to complete a flame test.
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b) | What colour flame is produced when a sample containing copper ions undergoes a flame test? A green B yellow C red D white
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c) | What colour flame is produced when a sample containing sodium ions undergoes a flame test? A green B yellow C red D white
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Question 2
A student wishes to identify the metal in a metal chloride solid sample. She thinks the metal could be sodium, potassium, calcium or aluminium. |
Describe the tests that can be performed to indicate the presence of each of these metal ions.
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Question 3
This question is about tests that are carried out on ionic substances to identify the ions present. |
a) | Hydrochloric acid is added to the solid being tested. Carbon dioxide is given off. State what must be present in the substance.
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b) | Describe the test for chloride ions and state the colour of the precipitate formed.
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c) | The student tests for iodide ions by adding dilute nitric acid, followed by silver nitrate solution. State the colour of the precipitate formed if iodide ions are present.
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d) | Hydrochloric acid is added to the solid, followed by barium chloride solution. A white precipitate forms. State what ion must be present in the solid.
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Question 4
A student wants to identify the gases present in three test tubes, A, B and C. |
a) | Describe how the student could test to see if any of the gases is carbon dioxide.
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b) | The student places a lighted splint in test tube A, which contains a colourless gas. A pop sound is heard. State the name of the gas in test tube A.
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c) | Describe the test for chlorine gas.
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Question 5
A student is completing qualitative tests on some unknown substances. The student predicts the substances contain halide ions. |
a) | Describe how to test for halides.
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b) | The table below shows the results of the tests. State which sample does not contain halide ions.
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c) | State the name of the halide ions found in the other samples.
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d) | Write the balanced chemical reaction for the reaction between sodium chloride and silver nitrate (AgNO3).
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Question 6
This question is about the reaction between copper carbonate and sulfuric acid. |
a) | Write a balanced chemical equation for the reaction between copper carbonate and sulfuric acid.
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b) | Describe a test the student could do to identify the gas produced.
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c) | Describe how the student would know when the chemical reaction has stopped.
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Question 7
This question is about the qualitative analysis of substances. |
a) | Match the description of each test to the substance it is testing for.
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b) | A student adds a small piece of sodium metal to a trough of water. Write a balanced symbol equation for the reaction between sodium and water.
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c) | The student captures the gas produced by holding a test tube above the sodium as it moves around on the water surface. Describe a test the student can complete to confirm that the gas produced is hydrogen gas.
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d) | Some ionic compounds contain potassium ions. Metal ions can be identified through flame tests. State the colour of the flame produced when the substance contains potassium ions.
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Question 8
This question is about qualitative tests on unknown substances. |
a) | A student has an unknown compound. She adds dilute hydrochloric acid and then barium chloride. A white precipitate forms. Which of the following is present in the substance? A carbonates B sulfates C halides
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b) | The student conducts a flame test for metal ions. Which of the following is incorrect? A a yellow flame will appear if sodium ions are present B an orange-red flame will appear if potassium ions are present C a yellow flame will appear if copper ions are present D a green flame will appear if lithium ions are present
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c) | Describe a simple test for chlorine gas.
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