Grade 9 Chemistry Review - Detailed Study Notes
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Last updated 11:38 PM on 3/26/26
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4 Terms
1
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How many electrons must each boron atom gain to achieve a full valence shell?
-5
2
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Explain why elements have negative charges
Because during the bonding process, oxygen gains two electrons to attain a stable octet. Gaining electrons from the charge to be negative.
3
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explain why soot, c(s), is present when incomplete combustion of propane, c3h6(g), occurs
Soot is present in incomplete combustion of propane because there isn’t enough oxygen, so some of the carbon in the fuel doesn’t fully oxidize to CO₂ and instead forms solid carbon.
4
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explain why elemnts react to form compounds
To achieve a stable octet or duet, making them non reactive.
