Grade 8 Integrated Science Rationalized Notes Complete

Institution: Junior Secondary

Course: Integrated Science

Content Category: Grade 8 Notes

Posted By: 35824167

Document Type: DOCX

Number of Pages: 51

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Download high quality comprehensively prpared Grade 8 Integrated Science Rationalized Notes. the notes covers all grade 8 rationalized strands.
GRADE 8 RATIONALIZED INTEGRATED SCIENCE
LESSON NOTES COMPLETE
STRAND 1- MIXTURES, ELEMENTS AND COMPOUNDS.
ELEMENTS AND COMPUNDS
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 chemically to form sodium chloride which is a compound.

Relating common elements to their symbols.
? Pure substances either elements or compounds has a unique name and symbol.
? A symbol is a sort -hand notation for the chemical name of an element.
? Chemical symbols are used instead of names by scientists because they are much easier, convenient and universally recognized.
? Compounds are represented by a chemical formula.
? A chemical symbol is usually derived from first letter of the English name of the element. ? It is also derived from Latin name of the element.

For example,
? H is the chemical symbol of hydrogen.
? O is the chemical symbol of Oxygen.
? K is the chemical symbol of potassium. For potassium the K is derived from Latin word Kalium.
? Some elements might start with same first letters, such as Carbon, Calcium, Chlorine and Copper have their names starting with letter C, therefore letter C can not be used to represent all of them as chemical symbol.
? The first letter C is assigned to represent Carbon, while the rest of the elements are assigned two letters from their name as follows.
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