Retake: Chemical Bonding and Compounds Concepts

How can an ionic compound be identified from its chemical formula?

• It contains only nonmetals.

• It is composed of a metal bonded to a nonmetal.

• It has a low melting point.

• It forms a soft, malleable solid.

Which property is characteristic of ionic compounds?

• They have low melting points.

• They form a brittle crystal lattice.

• They are always insoluble in water.

• They do not conduct electricity when molten.

In a chemical formula, what does a coefficient represent?

• The number of atoms of a specific element.

• The number of molecules of the compound.

• The charge of an ion.

• The number of valence electrons.

How many oxygen atoms are present in the chemical formula 3Mg3(PO4)2?

• 8

• 12

• 24

• 36

What is the correct chemical formula for the ionic compound formed between Aluminum (Al) and Sulfur (S)?

• AlS

• AlS2

• Al2S3

• Al3S2

What is a key characteristic that differentiates transition metals from other metals on the periodic table?

• They always form ions with a +1 charge.

• They can change their oxidation state or charge.

• They are always found in Group 1 or Group 2.

• They only form covalent bonds.

What is the oxidation state of tin (Sn) in the compound SnO2?

• +1

• +2

• +3

• +4

Which of the following best describes a polyatomic ion?

• A single atom with a positive or negative charge.

• A bundle of atoms that works together and carries a charge.

• A molecule that always has a neutral charge.

• An atom that can change its oxidation state.

When writing the chemical formula for a compound containing a polyatomic ion, when are parentheses necessary around the polyatomic ion?

• Always, to distinguish it from a monatomic ion.

• Only when the polyatomic ion has a positive charge.

• When the subscript for the polyatomic ion is greater than one.

• Never, as it complicates the formula.

When is a Roman numeral required in the name of an ionic compound?

• When the compound contains a polyatomic ion.

• When the metal is a transition metal.

• When the non-metal has a negative charge.

• When the compound is formed from two non-metals.