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NSC / Matric Chemistry — practice by topic

Browse 35 questions across 6 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Organic Molecules (11)Electrochemical Reactions (6)Acids and Bases (5)Chemical Equilibrium (5)Rate and Extent of Reaction (5)The Chemical Industry (5)

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Diamond and graphite are made only of carbon atoms. How are they classified?Read the answer and worked solution →In organic chemistry, what is meant by catenation?Read the answer and worked solution →What makes a hydrocarbon a saturated compound?Read the answer and worked solution →What does the functional group of an organic molecule decide?Read the answer and worked solution →

Worked practice questions

Diamond and graphite are made only of carbon atoms. How are they classified?

  1. They are not organic compounds
  2. They are organic compounds
  3. They are organic polymers
  4. They are organic acids
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Correct answer: A. They are not organic compounds

1. Every organic molecule contains carbon, but not every carbon compound is organic. 2. Carbon monoxide, carbon dioxide, carbonates, carbides and cyanides are all left outside the definition. 3. Diamond and graphite are pure carbon compounds and are also left outside it. 4. So neither of them counts as an organic compound. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 4: Organic molecules_

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In organic chemistry, what is meant by catenation?

  1. Like atoms sharing one shell
  2. Like atoms bonding into chains
  3. Unlike atoms swapping places
  4. Unlike atoms forming a ring
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Correct answer: B. Like atoms bonding into chains

1. A carbon atom can form bonds with other carbon atoms as well as with hydrogen and other elements. 2. That lets carbon atoms link to each other over and over to build long backbones. 3. The bonding of atoms of the same element into longer chains is called catenation. 4. Those chains may be unbranched or branched, and they may carry single, double or triple bonds. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 4: Organic molecules_

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What makes a hydrocarbon a saturated compound?

  1. It has one double bond
  2. It has one triple bond
  3. It has only single bonds
  4. It has no carbon rings
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Correct answer: C. It has only single bonds

1. Saturated means the molecule already holds as many hydrogen atoms as it possibly can. 2. That happens only when every carbon to carbon bond is a single bond. 3. Each carbon is then bonded to four other atoms, with no room for more. 4. A double or triple bond leaves the molecule short of hydrogen atoms, so it becomes unsaturated. 5. Rings are a separate matter and do not decide whether a compound is saturated. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 4: Organic molecules_

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