Unit 4/5 Ionic Bonding/ Nomenclature

Front

The name of FeCl₂ is

Back

iron (II) chloride

Answer explanation

FeCl₂ contains iron in the +2 oxidation state, hence it is named iron (II) chloride. The other options are incorrect as they either misrepresent the oxidation state or the naming convention.

Front

LiBr is called

Back

lithium bromide

Answer explanation

LiBr is the chemical formula for lithium bromide, a compound formed from lithium and bromine. The correct name is 'lithium bromide', distinguishing it from the incorrect options that suggest 'bromine' or 'lithium (I)'.

Front

Which of these combinations is an ionic compound made of? Metal and Metal, Nonmetal and Nonmetal, Metal and Nonmetal, Cation and Cation

Back

Metal and Nonmetal

Answer explanation

Ionic compounds are formed when a metal reacts with a nonmetal, resulting in the transfer of electrons. This creates cations and anions that attract each other, making 'Metal and Nonmetal' the correct choice.

Front

Name the following ionic compound: BeCl₂

Back

beryllium chloride

Answer explanation

The compound BeCl2 consists of beryllium (Be) and chlorine (Cl). The correct name is 'beryllium chloride' as it reflects the presence of one beryllium ion and two chloride ions without specifying oxidation states or prefixes.

Front

Name the following ionic compound: Cs₂S

Back

cesium sulfide

Answer explanation

The compound Cs₂S consists of cesium (Cs) and sulfide (S^2-). The correct name is cesium sulfide, as it reflects the ions present without indicating oxidation states, which are not needed here.

Front

Which of the following combinations would need roman numerals in the name? potassium + fluorine, beryllium + oxygen, boron + iodine, gold + oxygen

Back

gold + oxygen

Answer explanation

The combination of gold and oxygen requires Roman numerals because gold can have multiple oxidation states. In contrast, potassium, beryllium, and boron typically form compounds with fixed oxidation states.

Front

When naming ionic compounds with transition metals you need to include roman numerals to show the _____ of the metal.

Back

charge

Answer explanation

When naming ionic compounds with transition metals, Roman numerals indicate the charge of the metal ion. This is important because transition metals can have multiple oxidation states, and the Roman numeral specifies which one is used.

Front

When naming a compound, which of these is written first?

Back

Cation

Answer explanation

In naming a compound, the cation (positive ion) is written first, followed by the anion (negative ion). Therefore, the correct answer is 'Cation'.

Front

When naming a compound, what must the last part be?

Back

the element with "ide" at the end, unless it's a polyatomic ion

Answer explanation

When naming a compound, the last part typically ends with 'ide' unless it is a polyatomic ion, which has its own specific naming conventions. Therefore, the correct choice is the element with 'ide' at the end, unless it's a polyatomic ion.

Front

The name of the compound Ca₃(PO₄)₂

Back

calcium phosphate

Answer explanation

The compound Ca3(PO4)2 is named calcium phosphate, as it consists of calcium ions and phosphate groups. The other options do not accurately describe this compound's composition.