Year 10 Chemical Formulas Test

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1/10 Questions

Calcium chloride

About This Quiz

Revision of Chemical Formulas

This 10-item test will measure how well you understood the rules in writing down the correct chemical formulas of compounds. You have 5 minutes to complete the test. Identify the correct chemical formula of the given compound. Tick the letter that corresponds to your answer.

2.

Copper (II) oxide
Correct Answer

A.

Explanation

Copper (II) oxide refers to the compound formed by the combination of copper and oxygen, where copper has a charge of +2. The Roman numeral II in the name indicates the oxidation state of copper in the compound. Copper (II) oxide is a black solid that is commonly used as a pigment and in the production of ceramics and glass. It can also act as a catalyst in various chemical reactions.

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3
3.

Sodium hypochlorite
- NaClO4
- NaClO3
- NaClO2
- NaClO
Correct Answer

A. NaClO

Explanation

Sodium hypochlorite is represented by the chemical formula NaClO. This compound is formed by the combination of sodium (Na) and hypochlorite (ClO). The correct answer is NaClO, as it matches the given chemical formula for sodium hypochlorite.

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5
4.

Aluminum hydroxide
- Al(OH)3
- Al(OH)2
- AlOH
- AlO
Correct Answer

A. Al(OH)3

Explanation

Aluminum hydroxide is a chemical compound with the formula Al(OH)3. The formula indicates that each aluminum atom is bonded to three hydroxide ions, which consist of one oxygen atom and one hydrogen atom. The correct answer, Al(OH)3, represents the correct formula for aluminum hydroxide, as it accurately reflects the composition and bonding of the compound. The other options, Al(OH)2, AlOH, and AlO, do not correctly represent the composition or bonding of aluminum hydroxide.

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5.

Copper (II) sulfate
- Cu2SO4
- CuSO
- CuSO4
- Cu2(SO4)2
Correct Answer

A. CuSO4

Explanation

The correct answer is CuSO4 because it represents the chemical formula for copper (II) sulfate. In this compound, copper has a charge of +2, indicated by the Roman numeral II in parentheses. Sulfate is a polyatomic ion with a charge of -2, represented by the formula SO4. Therefore, the correct formula for copper (II) sulfate is CuSO4.

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4
6.

Potassium permanganate
- KMnO5
- KMnO4
- KMnO3
- KMnO2
Correct Answer

A. KMnO4

Explanation

Potassium permanganate is represented by the chemical formula KMnO4. The correct answer, KMnO4, matches the given formula. The other options, KMnO5, KMnO3, and KMnO2, do not match the correct formula for potassium permanganate.

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1
7.

Carbon dioxide
- C2O
- CO3
- CO2
- CO
Correct Answer

A. CO2

Explanation

The correct answer is CO2 because carbon dioxide is a compound made up of one carbon atom and two oxygen atoms. The other options, C2O, CO3, and CO, do not have the correct combination of atoms to form carbon dioxide.

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1
8.

Hydrochloric acid
- HClO4
- HClO
- HClO3
- HCl
Correct Answer

A. HCl

Explanation

Hydrochloric acid is represented by the chemical formula HCl.

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4
9.

Hyposulfurous acid
- H2SO4
- H2SO5
- H2SO3
- H2SO2
Correct Answer

A. H2SO2

Explanation

H2SO2 is the correct answer because it corresponds to the compound hyposulfurous acid. The prefix "hypo-" indicates that there is one less oxygen atom compared to the common form of the acid. In this case, hyposulfurous acid has two hydrogen atoms and two oxygen atoms, represented by the formula H2SO2. The other options, H2SO4, H2SO5, and H2SO3, do not match the given compound.

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6
10.

Ammonium acetate
- NH4C2H3O2
- NH4(C2H3O2)2
- (NH4)2C2H3O2
- (NH4)2(C2H3O2)2
Correct Answer

A. NH4C2H3O2

Explanation

Ammonium acetate is a compound made up of the ammonium ion (NH4+) and the acetate ion (C2H3O2-). The formula NH4C2H3O2 represents one ammonium ion and one acetate ion combined together.

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5