Chemical bonding

Ionic or electrovalent compounds do not conduct

     electricity in their ____________ state.

• Fused

• Solid

• None of the above

Which of the following is a common characteristic of

     a covalent compound?

• High melting point

• Do not consist of ions

• Always soluble in water

• Conducts electricity when it is in the molten state

The compound that does not have a lone pair of

     electron is ___________

• Water

• Ammonia

• carbon tetrachloride

• None of the above

Electrovalent compounds have _________ melting

     points.

• high

• low

An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is _________

• 17

• 11

• 18

• 20

The molecule containing a triple covalent bond is

• Ammonia

• Methane

• Water

• Nitrogen

Which of the following is not a typical property of an ionic compound?

• High melting point

• Conducts electricity in the molten and in the aqueous solution state

• They are insoluble in water

• They exist as oppositely charged ion even in the solid state.

What is the term defined in this case?

     A bond formed by a shared pair of electrons, where each bonding atom shares one electron to the pair.

• Covalent

• Coordinate

• Electrovalent

• Ionic

The property which is a characteristic of an

     electrovalent compound is that

• It is easily vapourised

• It has a low melting point

• It is a weak electrolyte

• It often exists as a solid

In covalent compounds, the bond is formed due to

     the __________ of electrons

• sharing

• transfer