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GCSE
Gcse Chemistry
Analysing Substances
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Q.1
What metal should the wire loop be made of that is holding your unknown compound during a flame test?
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Copper
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Silver
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Gold
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Platinum
Q.2
A white precipitate results from the reaction between an unknown substance and sodium hydroxide. Which ion CANNOT be present in the unknown substance?
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Calcium 2+
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Magnesium 2+
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Aluminium 3+
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Copper 2+
Q.3
Which of the following can iodine NOT be used for testing for?
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Presence of carbon dioxide
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Unsaturation of oils
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Presence of starch
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Unsaturation of hydrocarbons
Q.4
A titration is used to accurately measure volumes of liquids required to carry out chemical reactions such as neutralisation reactions. Name the long glass tube which is required to carry out a titration.
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Pipette
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Burette
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Clamp stand
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Conical flask
Q.5
The meniscus is the curve in the upper surface of a liquid caused by surface tension. When measuring the amount of liquid held in a burette, which part of the meniscus do you measure from?
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The bottom
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The edge
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The average height
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The top
Q.6
Which of the following compounds would burn yellow in the flame test?
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Sodium chloride
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Calcium chloride
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Potassium chloride
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Barium chloride
Q.7
Which element produces a green flame when burned in a flame test?
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Lithium
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Sodium
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Potassium
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Barium
Q.8
A reddish brown precipitate results from the reaction between an unknown substance and sodium hydroxide. Which ion is present in the unknown substance?
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Copper 2+
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Iron 2+
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Aluminium 3+
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Iron 3+
Q.9
Three unknown solutions are added to test tubes of dilute nitric acid and silver nitrate. Each shows a positive result for the test. What ions are present in each tube in order if the colours produced are white, cream and pale yellow?
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Iodide, bromide, chloride
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Chloride, iodide, bromide
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Chloride, bromide, iodide
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Iodide, chloride, bromide
Q.10
A chromatogram is produced in a process called chromatography. There are several types of chromatography. Which of the following is NOT a type of chromatography?
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Gas - liquid
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Gel permeation
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Ion-exchange
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UV-Visible
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