Chemistry Form 5 - 1

Which of the following elements forms an ion with a charge of +1?

• iron

• potassium

• calcium

• iodine

Which of the following is NOT a feature that supports the particulate theory of matter?

• There are empty spaces between the particles

• The particles are in constant motion

• There are no forces of attraction between the particles

• Temperature has an effect on the speed of motion of the particles

Diamond and graphite are allotropes of carbon because:

• Their atoms contain different numbers of neutrons

• They have the same physical properties but different chemical properties

• They exist in different physical states

• In the same state, they have distinct physical structures

The chemical properties of calcium are MOST similar to those of

• Aluminum

• Sodium

• Potassium

• Strontium

The electronic configuration of an atom of fluorine is:

• 2,7

• 2,8

• 2,8,1

• 2,8,8,1

A mixture of ethanol and water can be separated based on their different

• Boiling points

• Melting points

• Densities

• Solubilities

Which of the following substances sublime when heated?

I- Carbon monoxide

II - Carbon dioxide

III - Naphtalene

• I and II only

• I and III only

• II and III only

• I, II and III

A strip of paw-paw is placed in a beaker of water. After 30 minutes it was found that the strip had

• Increase in length and become rigid

• Increase in length and become soft

• Decrease in length and become rigid

• Decrease in length and become soft

The solubility of a solid in water usually:

• Increases as temperature increases

• Increases as temperature decreases

• Remains constant as temperature increases

• Decreases as temperature increases

Avogadro’s law states:

• Equal volumes of gases under the same conditions of temperature and pressure combine together

• Equal volumes of all gases under the same conditions of temperature and pressure contain the same number of

  atoms

• The volume of a given mass of a gas is inversely proportional to pressure, temperature being constant

• Equal volumes of all gases under the same conditions of temperature and pressure contain the same number of molecules