Question

1. In which of the following are the symbol and name for the ion given correctly?
a. Fe2+: ferrous ion; Fe3+: ferric ion <---
b. Sn2+: stannic ion; Sn4+: stannous ion
c. Co2+: cobalt(II) ion; Co3+: cobaltous ion
d. Pb2+: lead ion; Pb4+: lead(IV) ion

2. Which of the following is NOT cation?
a. iron(III) ion
b. sulfate <---
c. Ca2+
d. mercurous ion

3. Which of the following is true about the composition of ionic compounds?
a. They are composed of anions and cations. <---
b. They are composed of anions only.
c. They are composed of cations only.
d. They are formed from two or more nonmetallic elements.

4. Sulfur hexafluoride is an example of a ____.
a. monatomic ion
b. polyatomic ion
c. binary compound <---
d. polyatomic compound

5. Molecular compounds are usually _____.
a. composed of two or more transition elements
b. composed of positive and negative ions
c. composed of two or more nonmetallic elements <---
d. exceptions to the law of definite proportions

6. Consider a mystery compound having the formula MₓTᵧ. If the compound is not an acid, if it contains only two elements, and if M is not a metal, which of the following is true about the compound?
a. It contains a polyatomic ion
b. Its name ends in -ite or -ate
c. Its name ends in -ic
d. It is a binary molecular compound. <---

Answer 1

1) a)

Fe2+ = ferrous and Fe3+ = ferric

Other cations:

Sn2+ = stannous ion and Sn3+ = stannic

Co2+ = cobaltous and Co3+ = cobaltic

Pb2+ = plumbous and Pb4+ = plumbic

2) b)

Sulfate is an anion represented as: SO₄²⁻

Other Cations:

Iron(III) ion = Fe3+

Ca2+= calcium divalent cation

Mercurous ion = Hg₂²⁺

3) a)

Ionic compounds are composed of both, an anion (negatively charged ion) and a cation (positively charged ion). The bond is formed by the transfer of electrons from cation to anion.

4) c)

Sulfur hexafluoride (SF6) is a neutral molecule composed of two elements: S and F. Hence, it is a binary compound.

5) c)

Molecular compounds tend to be inorganic compounds typically composed of two or more non-metals. For example: water H2O and carbon dioxide CO2.

6) d)

The compound MxTy is not and acid and M is a non-metal. Thus it could be a metalloid, a binary molecular compound.