CHEMISTRY WAEC QUESTIONS AND ANSWERS EXPO 2020(ESSAY AND OBJECTIVE)
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SECTION B..
2ai) isomers
2aii) A = trans 1,2 dichloroethane
B=Cis 1,2 dichloroethane 2aiii) Yes.
2aiv)Because they are isomers. Isomers have same chemical properties but different physical properties.
2b) Destroying gaseous emissions
- Boiling is the rapid vaporization of a liquid 2bii) - WHEN NACL IS ADDED =>The more salt (or any
solute) added to water, the more you raise the boiling point. Reduction of atmospheric pressure => lowering the atmospheric pressure will lower the boiling point of the liquid.
2c) A saturated solution contains the maximum amount of solute that will dissolve at that temperature. Any further addition of solute will result in undissolved solid on the bottom of the container. An unsaturated solution contains less than the maximum amount of solute that can be dissolved at that temperature.
2cii) -Add solute to a liquid until no more will dissolve. -Solubility often increases with temperature, so you may be able to get more solute into a hot solvent than you would if - Increase in pressure
the solvent was cool
2cii)Temperature and Pressure.
Temperature affects the solubility of both solids and gases,
-Pressure only affects the solubility of gases
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