What's covered
Atoms, elements, compounds12
The periodic table12
Mixtures and pure substances10
Separation techniques9
Sample questions
A taste of the 43 questions in this topic — answers marked. Sign up to practise the full set with spaced repetition.
1Atoms, elements, compounds
What is an atom?
- •A chemical reaction product
- •A mixture of two elements
- ✓Smallest unit of an element
- •The smallest cell in the body
2Mixtures and pure substances
What is a mixture?
- •Always a pure substance with no mix
- •Same element in different states of matter
- •Two atoms chemically bonded together tightly
- ✓Two or more substances physically combined
3Separation techniques
Which method separates a soluble solid from a solvent?
- •Chromatography on paper
- ✓Evaporation or crystallisation
- •Filtration through paper
- •Magnetism attraction
4The periodic table
How is the periodic table arranged?
- •Alphabetical element name order
- •Date of element discovery
- •Element mass from heaviest to lightest
- ✓Increasing atomic number across rows
5Atoms, elements, compounds
What is an element?
- ✓A substance made of one type of atom
- •Any mixture of atoms
- •Anything found in a periodic table
- •Atoms in a compound only
6Mixtures and pure substances
What is a pure substance?
- •A liquid with nothing dissolved in it
- •Anything from a chemistry lab
- •Mixtures with sharp boundaries
- ✓Only one type of element or compound
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