miniUTME Week 1 (Chemical Bonding Quiz)

What is ionic bonding?

• Formation of covalent bonds between atoms

• Transfer of protons from one atom to another

• Sharing of protons between atoms

• Transfer of electrons from one atom to another

How are ions formed in ionic bonding?

• By sharing electrons between two atoms

• By one atom losing electrons and another gaining electrons

• By gaining protons and losing neutrons

• By forming covalent bonds

What is covalent bonding?

• Atoms sharing pairs of electrons

• Atoms sharing protons

• Atoms sharing neutrons

• Atoms sharing positive charge

Give an example of a substance that forms covalent bonds.

• Water (H2O)

• Sodium chloride (NaCl)

• Oxygen gas (O2)

• Iron (Fe)

What is polar covalent bonding?

• Sharing of protons between two atoms

• Formation of ionic bonds between two atoms

• Unequal sharing of electrons between two atoms

• Equal sharing of electrons between two atoms

Explain the difference between polar and nonpolar covalent bonds.

• Polar covalent bonds only occur in ionic compounds

• Nonpolar covalent bonds are stronger than polar covalent bonds

• Polar covalent bonds have unequal sharing of electrons, while nonpolar covalent bonds have equal sharing of electrons.

• Polar covalent bonds have more protons than nonpolar covalent bonds

What are Lewis dot structures used for?

• To represent the physical structure of an atom

• To represent the valence electrons of an atom and to show how they are shared in a chemical bond

• To indicate the number of protons in an atom

• To show the movement of electrons within an atom

Draw the Lewis dot structure for the molecule H2O.

• H-O-H

• H-O-O

• O-H-H

• H-H-O

What are some properties of substances with ionic bonding?

• Medium melting and boiling points, no conductivity when dissolved in water or melted, and gas formation

• High melting and boiling points, conductivity when dissolved in water or melted, and crystal formation

• Low melting and boiling points, insulating when dissolved in water or melted, and amorphous structure

• High melting and boiling points, no conductivity when dissolved in water or melted, and liquid formation

What are some properties of substances with covalent bonding?

• Higher melting and boiling points, conductive

• Lower melting and boiling points, non-conductive

• High solubility in water, metallic properties

• Low density, highly reactive