Chemistry Quiz

The octet rule states that atoms tend to form bonds so that each atom has eight __________ in its __________ shell.

• protons; valence

• electrons; middle

• neutrons; inner

• protons; core

• electrons; valence

Which of the following Lewis structures correctly represent CaCl₂?

• A

• B

• C

• D

Which of the following statements about metals are true? Select all that apply.

• Metals can be drawn into wires.

• Metals can be hammered into different shapes.

• Metals are not able to conduct electricity due to stationary electrons.

• Metals in solid form have specific crystal structures.

• Metals have low melting and boiling points.

Which of the following statements about covalent bonds are true? Select all that apply.

• A. Covalent bonds are comprised of metal atoms that share at least some of their valence electrons.

• B. Covalent bonds hold the atoms together in discrete molecules.

• C. Covalent bonds form when atoms of nonmetals are close enough to each other for their orbitals to overlap.

• D. Covalent bonds can be single, double, or triple bonds.

• E. Covalent bonds hold ionic compounds together.

Which compound has the lowest melting point according to the table?

• HBr

• PB₃

• CBr₄

• AgBr

Which compound has a melting point of -87°C?

• PB₃

• HBr

• CBr₄

• AgBr

Which compound has a melting point of 711°C?

• MgBr₂

• LiBr

• AgBr

• CBr₄

Which compound has a melting point of 91°C?

• MgBr₂

• LiBr

• AgBr

• CBr₄

Which of the following compounds is likely to be a liquid at room temperature based on its melting point?

• MgBr₂

• LiBr

• PB₃

• HBr

Which of the following statements is true about the melting points of the compounds listed in the table?

• All compounds have melting points above 0°C.

• All compounds have melting points below 0°C.

• Some compounds have melting points above 0°C and some below 0°C.

• None of the compounds have melting points above 0°C.