Which of the following compounds has a low melting point?

• lithium oxide

• aluminum chloride

• sulfur dioxide

• potassium sulfide

Element X has 12 protons while element Y has 17 protons. Which statement is correct when element X and element Y bonded together and formed a compound?

• The compound is gas at room temperature.

• The compound can conduct electricity.

• The compound has low melting point.

• The compound requires less heat to break the bonds on it.

How many electrons are shared in a molecule of bromine?

Calcium oxide is produced when calcium and oxygen bonded together. Which of the following is correct?

• Calcium gains two electrons.

• Calcium loses two electrons.

• Calcium shares two electrons.

• Calcium loses two protons

Which of the following is an example of chemical change?

• burning of paper

• chopping of wood

• smashing a car's windshield

• mixing salt and water

Which of the following is NOT a property of graphite?

• macromolecule

• conducts electricity

• low melting point

• used as a lubricant

In a compound aluminum oxide, one element will lose electrons while the other element will gain electrons. Which element will gain electrons?

Which is the correct symbol of oxygen ion?

A. O^2-

B. O²⁺

C. O⁶⁺

D. O^6-

^{Write the letter of the correct answer.}

Explain why diamond has a high melting and boiling point. [3]

Sodium chloride is formed when sodium ion reacts with chloride ion. Describe how the bond is formed between sodium and chlorine. [2]