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Summary Grade 9 Natural Sciences (NS) Summaries - Term 2 (Via Afrika)

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Grade 9 Natural Sciences (NS) Summaries - Term 2 (Via Afrika): These summaries are compiled using the Via Afrika textbook's Term 2 content. The summaries are in English, with additional notes provided by the compiler. Strand 2 - Matter and materials: Topic 1:  Compounds. Topic 2:  Chemical reactions. Topic 3:  Reactions of metals with oxygen. Topic 4:  Reactions of non-metals with oxygen. Topic 5:  Acids, bases and pH value. Topic 6:  Reactions of acids with bases: Part I, II and III. Topic 7:  Reactions of acids with metals.

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Summaries after sample

, The Periodic Table
The Periodic Table of Elements
Names of compounds
• Metals - shiny, can be pounded into shapes,
• Compound names show the elements present and good conductors of electricity and heat.
in it. • Non-metals - dull, brittle, and don't conduct
• Some are known by common names – e.g. electricity and heat.
water (H2O) and ammonia (NH3). • Semi-metals - share characteristics with
• Some show how many atoms of the element metals and non-metals and are found both
are present: sides of the zig-zag line.
- Mon(o) – 1 atom.
- Di – 2 atoms.


Sample
- Tri – 3 atoms. T1:
Compounds The Periodic Table of Elements
• Elements have a symbol, name, atomic number,
and mass number.


Summaries after sample •



Arranged in horizontal rows (periods) and vertical
columns (groups).
Developed by Dmitri Mendeleev in 1869.
Moving from right to left on the Periodic Table –
properties change from metallic to non-metallic.
Gold valued since
ancient times
• Gold - most malleable and ductile metal. Chemical formulae
• Gold was associated with wealth, leadership,
and prestige from ancient times. • Each element in a compound has its own symbol.
• Gold mining industry is the backbone of South • Compounds can be represented by chemical
Africa's economy. formulas.
• Formulas - indicate the ratio of elements.




T2-T1 Via Afrika Copyright © www.summariessa.co.za (DO NOT COPY)
GR9 NS Mind Map

,Sample
Summaries after sample

,Sample
Summaries after sample

,
,
,
,
, The Periodic Table
The Periodic Table of Elements
Names of compounds
• Metals - shiny, can be pounded into shapes,
• Compound names show the elements present and good conductors of electricity and heat.
in it. • Non-metals - dull, brittle, and don't conduct
• Some are known by common names – e.g. electricity and heat.
water (H2O) and ammonia (NH3). • Semi-metals - share characteristics with
• Some show how many atoms of the element metals and non-metals and are found both
are present: sides of the zig-zag line.
- Mon(o) – 1 atom.
- Di – 2 atoms.
- Tri – 3 atoms. T1:
Compounds The Periodic Table of Elements
• Elements have a symbol, name, atomic number,
and mass number.
• Arranged in horizontal rows (periods) and vertical
columns (groups).
• Developed by Dmitri Mendeleev in 1869.
• Moving from right to left on the Periodic Table –
properties change from metallic to non-metallic.
Gold valued since
ancient times
• Gold - most malleable and ductile metal. Chemical formulae
• Gold was associated with wealth, leadership,
and prestige from ancient times. • Each element in a compound has its own symbol.
• Gold mining industry is the backbone of South • Compounds can be represented by chemical
Africa's economy. formulas.
• Formulas - indicate the ratio of elements.




T2-T1 Via Afrika Copyright © www.summariessa.co.za (DO NOT COPY)
GR9 NS Mind Map

,

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