# Formula Of Ionic Compounds Quiz

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Answer the following questions based on your knowledge of ionic compounds. Let's start this awesome quiz now!

• 1.

### What is the formula for table salt?

• A.

Na1Cl1

• B.

Na2Cl2

• C.

Na2Cl1

• D.

Na1Cl2

A. Na1Cl1
Explanation
The formula for table salt is NaCl, which represents one atom of sodium (Na) and one atom of chlorine (Cl). Therefore, the correct answer is Na1Cl1.

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• 2.

### What is the formula for Aluminum oxide?

• A.

AlO

• B.

Al2O3

• C.

Al3O2

• D.

Al2O2

B. Al2O3
Explanation
The correct formula for Aluminum oxide is Al2O3. This is because aluminum has a charge of +3 and oxygen has a charge of -2. In order to balance the charges, two aluminum atoms are needed to combine with three oxygen atoms. Therefore, the formula for Aluminum oxide is Al2O3.

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• 3.

### What is the oxidation number on the phosphorus atom 'P' in chromium (III) phosphate, Cr(PO4)

• A.

-2

• B.

+3

• C.

+4

• D.

+5

D. +5
Explanation
In chromium (III) phosphate, Cr(PO4), the overall charge of the compound is neutral. The oxidation number of chromium (III) is +3 because it is a group 3 element and tends to lose 3 electrons to achieve a stable configuration. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must be zero. Since there is only one phosphorus atom in the compound, its oxidation number must be +5 to balance out the -3 oxidation number of chromium.

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• 4.

### The cation is always written first in an ionic compound.

• A.

True

• B.

False

A. True
Explanation
In an ionic compound, the cation is always written first because the cation is the positively charged ion and it is usually a metal. The anion, which is the negatively charged ion and is usually a non-metal, is written second. This is because the cation is the one that loses electrons and the anion is the one that gains electrons to form the compound. Therefore, the correct answer is true.

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• 5.

### Ammonium nitrate is used as a fertilizer, to make cold packs, and as an explosive. What is the formula of ammonium nitrate?

• A.

(NH)(NO)

• B.

(NH3)(NO3)

• C.

(NH4)(NO3)

• D.

(NH4)(NO2)

C. (NH4)(NO3)
Explanation
Ammonium nitrate is composed of ammonium ions (NH4+) and nitrate ions (NO3-). The correct formula for ammonium nitrate is (NH4)(NO3). This formula represents the combination of one ammonium ion and one nitrate ion, which are held together by ionic bonds. The ammonium ion consists of one nitrogen atom bonded to four hydrogen atoms, while the nitrate ion consists of one nitrogen atom bonded to three oxygen atoms. Together, these ions form a stable compound that is commonly used in agriculture as a fertilizer, in cold packs for therapeutic purposes, and unfortunately, in explosives.

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• 6.

### Cations are atoms that have _____________ electrons.

lost
Explanation
Cations are atoms that have lost electrons. When an atom loses one or more electrons, it becomes positively charged and forms a cation. This electron loss occurs when atoms undergo chemical reactions and transfer electrons to other atoms. The resulting cation has a positive charge because the number of protons in the nucleus exceeds the number of electrons. Therefore, the correct answer is "lost."

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• 7.

### What is the charge on any ion of an alkali metal?

• A.

+1

• B.

+2

• C.

-1

• D.

-2

A. +1
Explanation
Alkali metals are the elements in Group 1 of the periodic table, which includes elements like lithium, sodium, and potassium. These metals have one valence electron, which is easily lost during chemical reactions. When this electron is lost, the resulting ion has a positive charge. Therefore, the charge on any ion of an alkali metal is +1.

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• 8.

### What is the charge on the ion of any halogen?

• A.

+1

• B.

+2

• C.

-1

• D.

-2

C. -1
Explanation
The charge on the ion of any halogen is -1. This is because halogens have seven valence electrons and they tend to gain one electron to achieve a stable octet configuration. By gaining one electron, they acquire a negative charge of -1, making them an anion.

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• 9.

### What is the traditional name for the following ionic compound...  FeO?

• A.

Ferrous oxide

• B.

Ferric oxide

• C.

Ferrum oxide

• D.

Ferrylicious oxidocious

A. Ferrous oxide
Explanation
The traditional name for the ionic compound FeO is ferrous oxide. This is because the Fe ion has a +2 charge, which is indicated by the prefix "ferrous." The oxide ion has a -2 charge, so it does not need a specific prefix. Therefore, the correct name for FeO is ferrous oxide.

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• 10.

### What is the stock name given to the following ionic compound...  CuCl2?

• A.

Copper (I) chloride

• B.

Copper (II) chloride

• C.

Copper (III) chloride

• D.

Cupric chloride

B. Copper (II) chloride
Explanation
The correct answer is copper (II) chloride. This is because the Roman numeral II in parentheses indicates that copper has a +2 oxidation state in this compound. The formula CuCl2 indicates that there are two chloride ions for every copper ion, and since chloride has a -1 charge, copper must have a +2 charge to balance the overall charge of the compound. Therefore, the correct stock name for CuCl2 is copper (II) chloride.

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• 11.

### The number (+2) when written in a formula of an ion would be written as a subscript.

• A.

True

• B.

False

B. False
Explanation
In a formula of an ion, the number (+2) would be written as a superscript, not a subscript. This is because the charge of an ion is represented by a superscript, indicating the number of electrons gained or lost. A subscript, on the other hand, is used to indicate the number of atoms of an element in a compound. Therefore, the given statement is false.

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• 12.

### What is the charge on the lead ion (Pb) in the following formula...  PbO?

• A.

+1

• B.

+2

• C.

+3

• D.

+4

B. +2
Explanation
In the formula PbO, the oxygen atom has a charge of -2 since it is in Group 16 of the periodic table and usually has a charge of -2. Since the overall charge of the compound must be neutral, the lead ion (Pb) must have a charge of +2 to balance out the -2 charge of the oxygen atom. Therefore, the charge on the lead ion in PbO is +2.

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• 13.

### What is the stock name for the ionic compound with the formula of...  Cu(NO3)

• A.

Copper (II) nitrate

• B.

Copper (II) nitrite

• C.

Copper (I) nitrate

• D.

Copper nitride

C. Copper (I) nitrate
Explanation
The correct answer is copper (I) nitrate. This is because the formula Cu(NO3) indicates that there is one copper ion (Cu+) and one nitrate ion (NO3-) present in the compound. The Roman numeral (I) in the name "copper (I) nitrate" indicates the charge of the copper ion, which is +1. Copper (II) nitrate would indicate a copper ion with a charge of +2, which is not consistent with the given formula. Copper (II) nitrite and copper nitride are also incorrect as they do not match the given formula.

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• 14.

### What is the correct formula for the ionic compound made from the following ions...  Ba+2 and (HClO)-1

• A.

Ba2(HClO)

• B.

Ba2(HClO)3

• C.

Ba(HClO)

• D.

Ba(HClO)2

D. Ba(HClO)2
Explanation
The correct formula for the ionic compound made from the ions Ba+2 and (HClO)-1 is Ba(HClO)2. This is because the Ba+2 ion has a charge of +2, while the (HClO)-1 ion has a charge of -1. In order to balance the charges, we need two (HClO)-1 ions for every Ba+2 ion, resulting in the formula Ba(HClO)2.

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• 15.

### An ion that is made up of morr that one atom is called a ____________ ion.

polyatomic
Explanation
A polyatomic ion is an ion that consists of multiple atoms bonded together and carries a net electrical charge. In contrast, a monatomic ion is made up of a single atom. Therefore, an ion that is made up of more than one atom is called a polyatomic ion.

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• 16.

### What would be the correct 'acid name' for the following binary acid;  HBr, chemical name of hydrogen bromide

• A.

Hydrogen bronide

• B.

Hydrobromic acid

• C.

Hydrogen bromic acid

• D.

Bromic acid

B. Hydrobromic acid
Explanation
The correct acid name for the binary acid HBr is hydrobromic acid. This is because binary acids are named by using the prefix "hydro-" followed by the root name of the nonmetal element (in this case, bromine) and adding the suffix "-ic" to indicate that the acid has the maximum number of hydrogen atoms for that nonmetal. Therefore, hydrobromic acid is the correct name for HBr.

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• 17.

### What is the 'acid' name of the following ternary acid;  HClO, chemical name hydrogen hypochlorite

• A.

Hypochlorous acid

• B.

Hydrochlorous acid

• C.

Hydrogen chlorous acid

• D.

Hypochloric acid

A. Hypochlorous acid
Explanation
The chemical formula HClO indicates that the compound is composed of hydrogen (H), chlorine (Cl), and oxygen (O). The prefix "hypo-" indicates that there is one less oxygen atom compared to the "-ous" form of the acid. Therefore, the correct answer is hypochlorous acid.

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• 18.

### A compound formed between ions that have gained and lost electrons is called a(n) ___________ compound.

ionic
Explanation
A compound formed between ions that have gained and lost electrons is called an ionic compound. In ionic compounds, one or more electrons are transferred from one atom to another, resulting in the formation of positively charged ions (cations) and negatively charged ions (anions). These oppositely charged ions are attracted to each other and form a crystal lattice structure, resulting in the formation of an ionic compound. Ionic compounds typically have high melting and boiling points and conduct electricity when dissolved in water.

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• 19.

### How many total ions are in the following ionic compound formula...  Na2(SO4)1

• A.

3

• B.

2

• C.

1

• D.

7

A. 3
Explanation
The formula Na2(SO4)1 indicates that there are two sodium ions (Na2) and one sulfate ion (SO4) in the compound. Therefore, the total number of ions in the compound is three.

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• 20.

### The formula for ionic compounds must be written using the lowest whole number ratio betwen ions.

• A.

True

• B.

False

A. True
Explanation
Ionic compounds are formed by the combination of positively and negatively charged ions. The formula for an ionic compound represents the ratio of these ions in the compound. Since ions have specific charges, the formula should be written using the lowest whole number ratio between them to maintain electrical neutrality. This means that the subscripts in the formula should be simplified as much as possible. Therefore, the statement "The formula for ionic compounds must be written using the lowest whole number ratio between ions" is true.

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• Current Version
• Sep 02, 2024
Quiz Edited by
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• Nov 15, 2014
Quiz Created by
Antieaua

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