Chemistry
Grade-8
Easy
Question
Match the column A (Process) with Column B(Reactants used in process)
- (a) – (iv), (b) – (iii), (c) – (ii), (d) – (i)
- (a) – (iii), (b) – (ii), (c) – (i), (d) – (iv)
- (a) – (iv), (b) – (ii), (c) – (i), (d) – (iii)
- (a) – (ii), (b) – (iv), (c) – (i), (d) – (iii)
Hint:
The components are separated by this method. Evaporation is a type of vapourization. Sublimation is the change of solid to gas.
The correct answer is: (a) – (ii), (b) – (iv), (c) – (i), (d) – (iii)
- Electrolysis of molten NaCl breaks this compound down into its elements. Electrolysis of an aqueous NaCl solution produces a mixture of hydrogen and chlorine gases and an aqueous solution of caustic soda.
- Evaporation is a form of vapourization that occurs at the surface of a liquid as it transitions to the gas phase. A high concentration of evaporative substances in the surrounding gas slows down evaporation significantly.
- Sublimation is the transformation of a substance between solid and gaseous phases without a liquid intermediate. "Dry ice" is actually solid frozen carbon dioxide that sublimes or gasifies at subzero temperatures of -78.5°C (-109.3°F). The nebula you see is actually a mixture of cold carbon dioxide gas and cold, moist air.
- When methane burns in the air, it produces a blue flame. Given enough oxygen, methane burns to produce carbon dioxide (CO2) and water (H2O). It is very useful as a fuel because it produces a lot of heat when burned.
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