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5/96 MCQs for:

MATTER - PROPERTIES AND TRANSFORMATION: Principles Of Chemistry - Formulae, Moles And Equations

What is the definition of 'relative molecular mass'?

The sum of the relative atomic masses of all atoms in a molecule.

The mass of the lightest atom in a molecule.

The mass of one mole of a compound.

The mass of the compound in grams.

A mole of a substance is defined as __

The amount of the substance that contains the same number of elementary particles such as atoms, molecules, ions etc, as there are carbon atoms in exactly 12 grams of carbon-12.

The amount of the substance that contains the same number of elementary compounds such as atoms, molecules, ions etc, as there are carbon atoms in exactly 12 grams of carbon-12.

The amount of the substance that contains the same number of elementary particles such as atoms, molecules, ions etc, as there are in exactly 12 grams of carbon-12.

The amount of the substance that contains the same number of elementary particles such as atoms, molecules, ions etc, as there are carbon atoms in exactly 12 grams of carbon.

What is the mass contained in 2 moles of sulphuric acid?

195 g

196 g

98 g

0.02 g

In the experiment to determine the formula of magnesium oxide, why is the crucible lid lifted occasionally during heating?

To check if the reaction is complete.

To allow oxygen to enter and react with magnesium.

To cool down the magnesium.

To release built-up pressure.

What is the definition of a mole in chemistry?

The volume occupied by 1 gram of gas.

The mass of an atom.

The amount of substance that contains as many elementary entities as there are atoms in 12 grams of carbon-12.

The number of particles in 1 gram of a substance.