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“We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.” ― Antoine Lavoisier, Elements of Chemistry

Friday, 24 May 2013

Acids Bases - Checkpoint

FOR CP1
Dear CP1.....Do this worksheet as your assignment. Do this in doc/docx/pdf format. Send it to: markusanth2708@gmail.com). The sooner is better, you will get more extra points :)

ACIDS and BASES WORKSHEET-1
Most people think of acids as corrosive liquids which fizz when they come into contact with solid and burn when they touch the skin. The word acid comes from the latin word acidus meaning sour. As bases neutralise acids they are sometimes described as having properties which are opposite to acids. (Cambridge Checkpoint, Peter D Riley)

Answer the following questions.
  1. Why does wine go sour faster if the cork is removed from the bottle?
  2. How do you think the term of organic acid? Give example.
  3. How is a dilute solution different from a concentrated one?
  4. Which of the following substances are bases – copper chloride, sodium hydroxide, calcium carbonate, magnesium sulphate, copper oxide, lead nitrate, sodium hydrogen carbonate?
  5. Why are bases sometimes described as opposite of acids?
  6. How are acids and bases similar?
  7. Write word equations for the reactions between:

a.      Sulphuric acid and zinc oxide
b.      Hydrochloric acid and calcium hydroxide
c.       Nitric acid and calcium carbonate
d.      Hydrochloric acid and zinc carbonate
8.    How is the neutralisation of a carbonate different from the neutralisation of an oxide or a hydroxide?

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