DHS S3 Chemistry Exam Revision

An atom is neutral because

A compound of iron has the formula Fe(NO3)3. The charge on the iron ion in this compound is

• 1+

• 3+

• 1-

• 3-

The name of the above compound is

• 1,1-dimethylpropane

• 2-ethylpropane

• 2-methylbutane

• 3-methylbutane

Which of the following compounds exists as diatomic molecules?

• Carbon monoxide

• Sulphur dioxide

• Nitrogen trihydride

• Carbon tetrachloride

Solid ionic compounds do not conduct electricity because

• the ions are not free to move

• the electrons are not free to move

• solid substances never conduct electricity

• there are no charged particles in ionic compounds

The name of the above compound is

• but-2-ene

• pent-2-ene

• but-3-ene

• pent-3-ene

Which of the following hydrocarbons does not belong to the same homologous series as the others?

• CH4

• C3H8

• C4H10

• C6H12

Which of the following could be the molecular formula of a cycloalkane?

• C₇H₁₀

• C₇H₁₂

• C₇H₁₄

• C₇H₁₆

The table shows the numbers of protons, electrons, and neutrons in four particles, W, X, Y, and Z. Which pair of particles are isotopes?

• W and X

• W and Y

• X and Y

• Y and Z

When gas X was burned, a colorless liquid collected in the cooled test tube but there was no change in the limewater. Gas X could be:

• methane

• carbon monoxide

• hydrogen

• ethene