Unit 5 Chem Test

A tightly bound group of atoms that are covalently bonded and carry a charge is called a(n)... A. Polyatomic ion B. Acid C. Molecular compound D. Salt.

A

Covalent compounds usually... A. Have low melting points. B. Will conduct electricity. C. Are malleable. D. All of these.

A

In which compound is the ratio of metal ions to nonmetal ions 1 to 2? A. Calcium bromide B. Calcium oxide C. Calcium phosphors D. Calcium sulfide

A

Th malleability, conductivity, futility, and luster of metals can be explained by... A. Mobile electrons. B. Immobile electrons. C. Equally shared electron pairs. D. Unequally shared electron pairs.

A

The formation of a stable ionic compound from ions... A. Is always exothermic. B. May be either exothermic or endothermic. C. Is always endothermic. D. Neither absorbs nor releases energy.

A

In electron transfer involving a metallic atom and a nonmetallic atom during ion formation, which of the following is correct? A. The metallic atom gains electrons from the nonmetallic atom. B. The nonmetallic atom gains electrons from the metallic atom. C. Both atoms gain electrons. D. Neither atom gains electrons.

B

What is the overall charge on the compound MgCl2? A.-1 B. 0 C. +1 D. +2

B

Which of the following is a binary molecular(covalent) compound? A. BeHCO3 B. PCl5 C. AgI D. C6H12O6

B

In Chemical compounds, covalent bonds form when... A. The electronegativity difference between two atoms is very large. B. Electrons are completely transferred between two metals. C. Pairs of electrons are shared between two nonmetal atoms. D. Two nonmetal ions are attracted to each other by opposite charges.

C

What is the formula of calcium phosphate? A. Ca3PO4 B. Ca6PO4 C. Ca3(PO4)2 D. Ca2(PO4)3

C

Th formation of a chemical bond involves.. A. Only the protons. B. Protons and electrons. C. Electrons and neutrons. D. Only the electrons.

D