Elements, Compounds, Mixtures, Atoms and Molecules
1) A compound is a pure substance consisting of two or more elements that are chemically combined.
2) The different elements present in a compound are combined in a fixed ratio.
3) Every compound has a unique chemical formula.
4) The chemical formula of a compound gives information on:
- the types of atoms (elements) present in the compound
- the ratio of different atoms present in the compound
5) A compound can only be decomposed by chemical reactions or electricity
6) A mixture contains two or more substances that can be separated by physical means.
7) An alloy is a mixture of a metal with other elements (metals or non-metals).
(Refer to Manual Journal for more details and pictures of the set-ups)
2) The different elements present in a compound are combined in a fixed ratio.
3) Every compound has a unique chemical formula.
4) The chemical formula of a compound gives information on:
- the types of atoms (elements) present in the compound
- the ratio of different atoms present in the compound
5) A compound can only be decomposed by chemical reactions or electricity
6) A mixture contains two or more substances that can be separated by physical means.
7) An alloy is a mixture of a metal with other elements (metals or non-metals).
(Refer to Manual Journal for more details and pictures of the set-ups)