Question 1

Which two elements are most likely to form a covalent bond?

Accepted Answer

Silicon and oxygen

Answer

Calcium and oxygen

Answer

Sulfur and potassium

Answer

Aluminium and bromine

Question 2

Which of the following elements does not exist as diatomic molecules?

Accepted Answer

Helium

Answer

Chlorine

Answer

Fluorine

Answer

Hydrogen

Question 3

Which of the following diatomic molecules contains a double covalent bond?

Accepted Answer

Oxygen

Answer

Bromine

Answer

Iodine

Answer

Nitrogen

Question 4

What shape best describes a methane (CH₄) molecule?

Accepted Answer

Tetrahedral

Answer

Angular

Answer

Linear

Answer

Trigonal pyramid

Question 5

What shape best describes a molecule of ammonia (NH₃)?

Accepted Answer

Trigonal pyramid

Answer

Angular

Answer

Tetrahedral

Answer

Linear

Question 6

Which of the following statements is false?

Accepted Answer

Covalent molecular substances have high melting points

Answer

Covalent molecular substances have weak attractions between molecules

Answer

Covalent molecular substances cannot conduct electricity

Answer

Covalent molecular substances have strong covalent bonds within molecules

Question 7

Which of the following statements is true?

Accepted Answer

Covalent network substances have a network of strong covalent bonds within one giant structure

Answer

Covalent network substances dissolve in water

Answer

Covalent network substances conduct electricity

Answer

Covalent network substances have low melting and boiling points

Question 8

A covalent bond forms when

Accepted Answer

Two positive nuclei are held together by their common attraction for a shared pair of electrons

Answer

Two positive nuclei are attracted to each other

Answer

Atoms lose or gain electrons to obtain the stable electron arrangement of a noble gas

Answer

The electrons from two atoms are attracted to each other

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