Pure Substances (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is a pure substance in chemistry?
What is a pure substance in chemistry?
One with only one compound or element
What must chemically pure water contain?
What must chemically pure water contain?
Only molecules
What are the two main methods for testing purity?
What are the two main methods for testing purity?
Melting point and boiling point analysis
What equipment is used to hold crystals during melting point analysis?
What equipment is used to hold crystals during melting point analysis?
Capillary tube
How does a pure solid melt?
How does a pure solid melt?
Exactly at its melting point
At what temperature does an impure solid melt compared to a pure one?
At what temperature does an impure solid melt compared to a pure one?
At a lower temperature
How does an impure substance melt differently to a pure one?
How does an impure substance melt differently to a pure one?
Over a range of temperatures
How does a pure liquid boil?
How does a pure liquid boil?
Exactly at its boiling point
At what temperature does an impure liquid boil compared to a pure one?
At what temperature does an impure liquid boil compared to a pure one?
At a higher temperature
Does an impure liquid boil at a single temperature?
Does an impure liquid boil at a single temperature?
No, over a range of temperatures
What are formulations?
What are formulations?
Purposeful mixtures
Why are ingredients in a pain relief tablet carefully measured?
Why are ingredients in a pain relief tablet carefully measured?
To ensure it works effectively and safely