Chemistry Unit 3

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  • Created by: camKD
  • Created on: 08-04-14 12:45
What is the energy change represented by A? Explain how this reaction is Exothermic.
-energy needed to start the reaction -the reaction is exothermic because the energy level / value of products is less than the energy level / value of reactants
1 of 6
Explain how adding sodium carbonate softens permanent hard water.
-the carbonate ions react with calcium / magnesium ions, forming a precipitate of calcium carbonate / magnesium carbonate -therefore the water is softened because this removes the calcium / magnesium ions, which cause hardness, from the water
2 of 6
Explain how hard water filter containing carbon, silver and ion exchange resin softens permanent hard water.
-sodium / hydrogen ions are present in the ion exchange resin -therefore the water is softened because these ions take the place of calcium / magnesium ions that cause hardness in the water
3 of 6
When ethanol dissolves in water the solution formed is not alkaline. Why?
-ethanol has only covalent bonds in its molecule
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What is the formula functional group for alcohols?
OH
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What equipment must you use during a titration?
• burette • acid • pipette used for alkali • indicator used (phenolphthalein) • white background / tile • beaker
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Other cards in this set

Card 2

Front

Explain how adding sodium carbonate softens permanent hard water.

Back

-the carbonate ions react with calcium / magnesium ions, forming a precipitate of calcium carbonate / magnesium carbonate -therefore the water is softened because this removes the calcium / magnesium ions, which cause hardness, from the water

Card 3

Front

Explain how hard water filter containing carbon, silver and ion exchange resin softens permanent hard water.

Back

Preview of the front of card 3

Card 4

Front

When ethanol dissolves in water the solution formed is not alkaline. Why?

Back

Preview of the front of card 4

Card 5

Front

What is the formula functional group for alcohols?

Back

Preview of the front of card 5
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