GCSE Chemistry AQA C8 Chemical Analysis (Paper 2 -
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GCSE Chemistry AQA C8 Chemical Analysis (Paper 2 -
GCSE Chemistry AQA C8 Chemical Analysis (Paper 2 - Triple) Rated A+
1. What is the definition of a pure substance?
Answer: A pure substance is a substance that contains only one compound or element throughout.
2. How can you determine the purity of a substance?
Answer: You can determine the...
GCSE Chemistry AQA C8 Chemical Analysis (Paper 2 -
GCSE Chemistry AQA C8 Chemical Analysis (Paper 2 -
GCSE Chemistry AQA C8 Chemical Analysis (Paper 2 -
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GCSE Chemistry AQA C8 Chemical Analysis (Paper 2 - Triple) Rated A+
1. What is the definition of a pure substance?
Answer: A pure substance is a substance that contains only one compound or element throughout.
2. How can you determine the purity of a substance?
Answer: You can determine the purity of a substance by measuring its melting and boiling points and
comparing it with data from a book. The impurer a substance, the lower its melting point and higher its
boiling point.
3. What are formulations, and why are they important?
Answer: Formulations are mixtures with a precise purpose made by a formula, and they are used in
various products such as cleaning products, metal alloys, cosmetics, and fertilizers.
4. What is chromatography, and how does it work?
Answer: Chromatography is an analytical method that separates substances in a mixture by using a
mobile phase (a liquid or gas) that moves through a stationary phase (a solid or thick liquid). The time
spent in each phase depends on the solubility and attraction of the molecules to the phases.
5. What is the Rf value, and how is it calculated?
Answer: The Rf value is calculated by dividing the distance traveled by a substance by the distance
traveled by the solvent. It helps identify the relative mobility of substances during chromatography.
6. How do you test for gases such as chlorine, oxygen, and carbon dioxide?
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