Covalent Bonding and Properties Quiz

What is the primary characteristic of a covalent bond?

• It has a high melting point.

• It is formed between a metal and a non-metal.

• It involves the transfer of electrons.

• It is formed by sharing electrons between non-metals.

Which of the following is true about the boiling and melting points of covalent compounds?

• They are always gases at room temperature.

• They have lower boiling and melting points than ionic compounds.

• They are usually solids at room temperature.

• They have higher boiling and melting points than ionic compounds.

Why is graphite an exception among covalent compounds in terms of conductivity?

• It has a metallic structure.

• It contains delocalized electrons that allow electricity to flow.

• It is a liquid at room temperature.

• It is made of ionic bonds.

Which of the following is a diatomic molecule?

• Oxygen

• Carbon dioxide

• Helium

• Methane

What is the octet rule?

• Atoms form bonds to have eight protons in their nucleus.

• Atoms always have eight electrons in their outer shell.

• Atoms do not form bonds if they have eight electrons.

• Atoms tend to gain, lose, or share electrons to have eight electrons in their valence shell.

How many pairs of electrons are shared in a double covalent bond?

• Four pairs

• Three pairs

• Two pairs

• One pair

Which molecule is an example of a triple covalent bond?

• Water (H2O)

• Oxygen (O2)

• Nitrogen (N2)

• Carbon dioxide (CO2)

What is a key difference between ionic and covalent bonds?

• Ionic bonds have low melting points.

• Covalent bonds are formed between metals and non-metals.

• Ionic bonds are formed by sharing electrons.

• Covalent bonds have definite shapes.

Which type of bond is more flammable?

• Metallic bonds

• Hydrogen bonds

• Covalent bonds

• Ionic bonds

At room temperature, covalent compounds are usually found in which state?

• Solid

• Liquid or gas

• Plasma

• Bose-Einstein condensate