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close. compound A pure substance made from two or more elements which are chemically bonded in a fixed ratio. and. mixtures. close. mixture When two or more compounds or elements are present ...
A compound is a substance that contains atoms of two or more different elements, chemically joined together. For example, water is a compound of hydrogen and oxygen, chemically joined together ...
GCSE; WJEC; Elements, compounds and formulae Elements, compounds and mixtures. An overview of the definitions of different types of chemicals, how chemicals can be represented in chemical ...
Elements, compounds and mixtures; ... You may be required to use a key to draw your own diagram of a molecule, eg: Using this key, the molecules SH 2 and NH 3 would be represented like this.
Elements, compounds and mixtures. Purity and separating mixtures - OCR Gateway. ... The structure and bonding in a substance are modeled in different ways, including dot and cross diagrams.
An impure substance is one which contains a mixture of elements, a mixture of compounds, or a mixture of both elements and compounds. ... A particle diagram for a compound will have two or more ...
Elements, compounds and mixtures - (CCEA) Most elements are rarely found in their pure form. They are found chemically combined with other elements in compounds. Compounds are often found mixed ...
This particle diagram represents water or, to use its chemical formula, H₂O which is a compound of the elements hydrogen and oxygen. In one molecule of water, there are two hydrogen atoms and ...
Elements, compounds and mixtures. Separating mixtures - OCR Gateway. ... The structure and bonding in a substance are modelled in different ways, including dot and cross diagrams.
Learn about elements, compounds and mixtures in this KS3 Chemistry guide from BBC Bitesize. Atoms are the building blocks of everything. Atoms can form strong bonds with each other, making ...