Chemical Bonding

What type of elements generally form an ionic compound?

• metal and non-metal

• 2 non-metals

• 2 metals

• none of the above

What elements generally form covalent bonds?

• metal and non-metal

• 2 non-metals

• 2 metals

• none of the above

Why do atoms form chemical bonds?

• To gain more electrons.

• To add or take away electron shells.

• To achieve a full valence shell.

• To have a full inner shell.

If an atom loses two electrons what charge will it have?

• 2-

• 1-

• 1+

• 2+

Atoms in a covalent compound

• share electrons

• transfer electrons

• lose electrons

• gain electrons

Which of the following are physical properties of ionic compounds?

• high melting and boiling points

• does not dissolve in water

• conducts electricity in the solid state

• conducts electricity in the liquid state

Which of the following are not physical properties of covalent compounds?

• low melting and boiling points

• conducts electricity

• insoluble in water

• exists mainly as hard solids

What is the formula of the compound formed by lithium and nitrogen?

Write the chemical formula of dihydrogen sulfide.

Why is the melting point of sodium oxide (Na₂O) much higher than water (H₂O)?

• The ionic bonds in sodium oxide are generally stronger than the covalent bonds in water.

• There are more ionic bonds in sodium oxide than covalent bonds in water.

• Sodium oxide has a larger molecular size than water, which requires more energy to overcome.

• The forces of attraction between the ions in sodium oxide are stronger than that between the molecules in water.