grade 9 science covalent bonding

Covalent bonding involves

• metal atoms losing and gaining electrons

• non-metal atoms losing electrons

• non-metal atoms sharing electrons

• metals gaining electrons

An sulphur atom has 6 valence electrons. Two sulphur atoms will bond by forming a

• single covalent bond

• double covalent bond

• triple covalent bond

• ionic bond

The diagram shows the electron dot/cross diagram for phosphorous trichloride. Which one of the following best describes the bonds?

• 3 single bonds

• 3 double bonds

• 1 single and 2 double bonds

• 2 single and 1 double bond

The Lewis structure for silicon disulphide is shown. Which one of the following is correct?

• there are four single bonds

• a total of 4 electrons are bring shared

• there are two single bonds

• a total of 8 electrons are being shared

Bromine atoms form the molecule Br₂. Each bromine atom has 7 valence electrons. How many electrons will each bromine atom share with the other bromine atom?

• 1

• 2

• 3

• 7

Carbon and hydrogen for the compound shown in the diagram. Which one of the following best represents the formula of the covalent compound?

• C₂H₅OH

• CH₆CO

• H₆C₂OH

• COHC₄H₄

Which one of the following is the correct Lewis dot structure for sulphur difluoride?

• A

• B

• C

• D

Which one of the following is the correct Lewis structure for the nitrogen molecule (N₂)?

• A

• B

• C

• D