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This quiz contains 14 questions from a mix of 1 subtopics.
Chemical analysis (also known as analytical chemistry) is about:
The instruments and methods we use to separate, identify, and quantify different substances.
The study of carbon-containing compounds
The application of quantum mechanics to chemical systems
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In chemistry, a pure substance is a:
Single element or compound that hasn't been mixed with any other substances
Substance that has had nothing added to it
Single element that hasn't been mixed with any other substances
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Which of the following is an example of a pure substance?
Distilled water
Milk
Fruit juice
Clay
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True or false? Pure substances always melt and boil at specific temperatures.
True
False
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Pure water boils at 100°C, and freezes at 0°C.
A student is given an unknown, transparent, colourless liquid. What test could be done to see if the liquid is pure water?
(Select all that apply)
See if the liquid can be burned
Freeze it, and see if the freezing point is 0°C
Boil it, and see if the boiling point is 100°C
See if the liquid evaporates
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A student tests the melting point of a sample of salol. The sample starts melting at 36°C, but it doesn't melt completely until the temperature is 48°C. Is the sample chemically pure, or impure?
Pure
Impure
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molecules / elements / mixtures / formula / beaker
Formulations are that have been prepared using a specific .
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components / function / large / precise
Formulations are made from amounts of different , and each component has a particular .
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Which of the following would require a formulation?
(Select all that apply)
Cleaning agents
Medicines
Distilled water
Paints
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Which of the following techniques can be used to separate substances?
(Select all that apply)
Crystallisation
Distillation
Chromatography
Filtration
Dissolving
Flame tests
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If we test a substance for purity by measuring its boiling point, is that a physical test or a chemical test?
Physical
Chemical
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Which of the following is a chemically pure substance?
Air
Diamond
Sea water
Paint
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True or false? Mixtures have specific melting points.
True
False
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What is a formulation?
A type of solvent
A mixture that has been designed as a useful product
A recipe to make pure chemicals
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