IGCSE Chemistry: Specimen Questions with Answers 146 - 148 of 240

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Question 146

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Short Answer▾

What is the molecular formula of malonic acid?

[1 Marks]

Explanation

Molecular formula of malonic acid is C3H4O4.

Question 147

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Short Answer▾

Alkanes and alkenes are both series of hydrocarbons

What is the difference between these two series of hydrocarbons?

Explanation

  1. Saturated hydrocarbons are the simplest of the hydrocarbon species. They are composed entirely of single bonds and are saturated with hydrogen. The formula for acyclic saturated hydrocarbons (i.e.. , alkanes) is . The most general form of saturated hydrocarbons is , where r is the number of rings. Those with exactly one ring are the cycloalkanes. Saturated hydrocarbons are the basis of petroleum fuels and are found as either linear or branched species.
  2. Unsaturated hydrocarbons have one or more double or triple bonds between carbon atoms. Those with double bond are called alkenes. Those with one double bond have the formula (assuming non-cyclic structures) . Those containing triple bonds are called alkyne. Those with one triple bond have the formula .

Question 148

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Statement

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According to “Gay-Lussac՚s Law of Combining Volumes” , the volume of solids and liquids are assumed to be zero in a chemical reaction.

Answer

TRUE

Explanation

The volume of solids and liquid does not change remarkably on slight change in temperature but volume of gases change tremendously. “Gay- Lussac՚s Law of Combining Volumes” deals with volumes. Since there is no remarkable change in volume of solids and liquids, hence according to “Gay-Lussac՚s Law of Combining Volumes” , the volume of solids and liquids are assumed to be zero in a chemical reaction.

Thus the given statement is true.

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