Chemistry

Covalent compounds can be formed between

• a metal and a non-metal

• a positive ion and a negative ion

• two identical non-metal atoms, excluding the noble gases

• two identical non-metal atoms, including the noble gases

Which of the following processes suggests that matter is made up of minute particles?

• Diffiusion

• Capillarity

• Evaporation

• Distillation

Which of the following statements BEST describes the difference between an atom and an ion?

• An atom is electrically neutral but an ion is positively charged.

• An atom is electrically neutral but

  an ion is negatively charged.

• An atom contains equal numbers of protons andelectrons whereas an

  ion contains more electrons than protons.

• An atom contains equal numbers of protons and electrons whereas an

  ion contains unequal numbers of protons and elecffons.

Which ofthe followingfeatures are true about the arrangement of electrons, protons and neutrons in an atom?

• Protons and neutrons are found in the nucleus.

• Electrons can be found anywhere outside the nucleus.

• The number of protons is the same as the number of neutrons.

The mass number ofan element is the number

of

• neutrons in an atom of the element

• protons and electrons in an atom of

  the element

• neutrons and protons in an atom of

  the element

• protons, neutrons and electrons in

  an atom of the element

From which of the following substances can a solid be obtained by the process of sedimentation?

• Gels

• Foams

• Emulsions

• Suspensions

Which set of elements has atoms with two electrons in their outer shells?

• Group 1

• Group 2

• The halogens

• Period 3

Which set of elements forms molecules which contain two atoms?

• Group 1

• Group 2

• The halogens

• Period 3

Which ofthe following energy changes occurs during the breaking of a chemical bond?

• Energy is released.

• Energy is required.

• There is no energy change.

• The process is exothermic.

Which ofthe following oxides reactwith both acids and bases?

• MgO

• CuO

• Al2O3 (The numbers are sub-script)

• CaO