Grade 8 Integrated Science rationalised notes

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STRAND 1- MIXTURES, ELEMENTS AND COMPOUNDS.

1.1-Elements & Compounds.Meaning of Atoms, Elements, molecules and Compounds.

 Matter is anything that occupies space and has mass.

 Matter is composed of pure substances and mixtures.

 The pure substances are can be element and compounds while the mixtures can either be uniform or non-uniform.

 An element is a substance that cannot be decomposed into simpler substances by chemical or physical means.

 An element is a pure substance which cannot be made simpler using chemical means.

 Elements are the building blocks of matter. Everything around is made up of an element or elements.

 An element is made of atoms.

 Atoms of the same element are identical.

 A compound is pure substance that consists of atoms of two or more elements that are chemically joined together.

 Compounds are formed when atoms of different elements react. Compounds can be broken down into elements through chemical reactions. Sodium and chlorine are elements that combine………….