A -Level Molecules, Transport and Health_2

The chemical bond formed when two atoms share electrons is called a ______ ____.

Covalent bonds are very strong and the molecules formed are usually neutral, creating ​ (a)  

• Nonpolar molecules
• Ionic compounds and polar molecules
• Metallic
• Ionic compounds
• Polar molecules

1. What type of compounds are formed by covalent bonds when the molecules are usually neutral?

• 1. a) Ionic compounds

• 1. b) Polar molecules

• 1. c) Metallic bonds

• 1. d) Nonpolar molecules

1. In some covalent compounds, the molecules are slightly __________.

• 1. a) Ionized

• 1. b) Neutralized

• 1. c) Polarized

• 1. d) Depolarized

1. The slight polarization in covalent compounds indicates that:

• 1. a) The molecules have ionic bonds.

• 1. b) The molecules have metallic bonds.

• 1. c) The electrons in the covalent bonds are evenly shared.

• 1. d) The electrons in the covalent bonds are not evenly shared.

1. Which of the following best describes the strength of covalent bonds?

• 1. a) Weak

• 1. b) Moderate

• 1. c) Strong

• 1. d) Indeterminate

1. Which type of compounds are formed when covalent bonds are strong and the molecules are usually neutral?

• 1. a) Ionic compounds

• 1. b) Polar molecules

• 1. c) Metallic bonds

• 1. d) Nonpolar molecules

1. What is a dipole?

• 1. a) A covalent bond between two atoms of similar electronegativity

• 1. b) A covalent bond between two atoms of different electronegativity

• 1. c) A molecule with a separation of positive and negative charges

• 1. d) A molecule with a symmetrical electron distribution

1. The molecule is described as a polar molecule. This polarity is particularly common if the bond involves:

• 1. a) Transition metals

• 1. b) Noble gases

• 1. c) Carbon atoms

• 1. d) Hydrogen atoms

1. When ionic substances dissolve in water, the ions separate in a process called:

• 1. a) Ionization

• 1. b) Dissociation

• 1. c) Polarization

• 1. d) Covalent bonding