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Science: Middle School: Grades 6, 7 and 8 Quiz - Compounds (Questions)

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In Science terms, a chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. There are literally billions of compounds!

A compound is a substance which contains .......

[ ]	only one type of atom
[ ]	only two types of atom
[ ]	two or more chemicals which can be easily separated
[ ]	two or more elements chemically joined together

The number of different elements in calcium carbonate (CaCO₃) is .......

[ ]	2
[ ]	3
[ ]	4
[ ]	5

Which of the following could have been formed by reacting iron with sulfur?

[ ]	Iron oxide
[ ]	Sulfuric iron
[ ]	Iron sulfide
[ ]	Sulphuric acid

The formula of methane is CH₄. Which of these is true?

[ ]	A molecule of methane contains five atoms
[ ]	A molecule of methane contains five different elements
[ ]	An atom of methane contains two different elements
[ ]	Methane contains five molecules

Which of these is NOT a compound?

[ ]	Carbon monoxide
[ ]	Chlorine
[ ]	Hydrochloric acid
[ ]	Propane

How many atoms in the formula CuSO₄?

[ ]	3
[ ]	4
[ ]	6
[ ]	7

The correct formula for carbon tetrachloride is .......

[ ]	C₃Cl
[ ]	C₄Cl
[ ]	CCl₃
[ ]	CCl₄

The smallest particle of carbon dioxide (CO₂) that still has the properties of carbon dioxide is called .......

[ ]	a molecule
[ ]	a proton
[ ]	an atom
[ ]	an ion

Which of these word equations is INCORRECT?

[ ]	Copper + oxygen → copper oxide
[ ]	Hydrogen + chlorine → hydrogen chlorine
[ ]	Iron + chlorine → iron chloride
[ ]	Magnesium + oxygen → magnesium oxide

10.

Which is the correct formula equation?

[ ]	Mg + O → MgO
[ ]	Mg + O₂ → MgO₂ →
[ ]	2 Mg + O₂ → Mg₂O₂
[ ]	2 Mg + O₂ → 2 MgO

Science: Middle School: Grades 6, 7 and 8 Quiz - Compounds (Answers)

A compound is a substance which contains .......

[ ]	only one type of atom
[ ]	only two types of atom
[ ]	two or more chemicals which can be easily separated
[x]	two or more elements chemically joined together

The number of different elements in calcium carbonate (CaCO₃) is .......

[ ]	2
[x]	3
[ ]	4
[ ]	5

Ca, C and O

Which of the following could have been formed by reacting iron with sulfur?

[ ]	Iron oxide
[ ]	Sulfuric iron
[x]	Iron sulfide
[ ]	Sulphuric acid

There are two elements joining together so the name ends in -ide