IGCSE Chemistry: Specimen Questions with Answers 188 - 190 of 240

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Question 188

Question

MCQ▾

In the history of man, the copper age was followed by the ________ age.

Choices

Choice (4)

a.

Silver

b.

Copper

c.

Iron

d.

Golden

Answer

c.

Explanation

In the history of man, the copper age was followed by the iron age.

Question 189

Write in Short

Short Answer▾

Gasoline is a mixture of hydrocarbons containing between 5 and 10 carbon atoms. Four of these hydrocarbons are shown below

Which one of these structures, A, B, C or D, has the highest relative molecular mass?

You are not expected to do any calculations.

Explanation

Correct Option is option B because in option B there is the longest chain of hydrocarbon so it has highest relative molecular no.

Question 190

Write in Short

Short Answer▾

Aluminum and gallium are in Group III of the Periodic Table.

Gallium is a metal. Describe three physical properties of gallium which are typical of most metals.

Explanation

  1. Gallium is a metal because gallium can conduct electricity and heat which is a property of metal.
  2. Gallium is a metal of because melting point of gallium is also high as compared to liquid and gas which is a property of metal.
  3. gallium is the only one that is neither highly reactive nor highly toxic and can therefore be used in metal-in-glass high-temperature thermometers which is also the property of metal.

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