CIE Chemistry (US-0439): Specimen Questions with Answers 95 - 97 of 240

Question number: 95

Short Answer Question▾

Write in Short

Substances can be classified as:

Elements can be divided into:

  1. Define each of the following terms:

compound

Explanation

a compound is a substance that results from a combination of two or more different chemical element s, in such a way that the atom s of the different elements are held together by chemical bonds that are difficult to break.

Question number: 96

True-False▾

Is the Following Statement True or False?

In the following displacement reaction:

is a salt and is an acid. Can we obtain from the reaction between and ?

Answer

FALSE

Explanation

No, we cannot obtain from the reaction between and .

Nitric acid, being a strong oxidising agent, cannot produce sulphuric acid, which is a reducing agent. Displacement reaction will not occur though the reaction seems to be displacement reaction.

Question number: 97

Short Answer Question▾

Write in Short

A sealed tube containing an equilibrium mixture of nitrogen dioxide and dinitrogen tetroxide was placed in a beaker of ice cold water. The color of the mixture changed from brown to pale yellow.

Is the forward reaction exothermic or endothermic? Give an explanation for your choice.

Explanation

Type of this reaction is exothermic because when this reaction happens then 57.2 J

  1. Sulfuric acid and malonic acid are both dibasic acids. One mole of a dibasic acid can form two moles of hydrogen ions.