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Elementary School: 3rd, 4th & 5th Grade
Science
Compounds
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Q.1
A compound is a substance which contains .......
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only one type of atom
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only two types of atom
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two or more chemicals which can be easily separated
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two or more elements chemically joined together
Q.2
The number of different elements in calcium carbonate (CaCO ) is .......
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2
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3
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4
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5
Q.3
Which of the following could have been formed by reacting iron with sulfur?
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Iron oxide
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Sulfuric iron
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Iron sulfide
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Sulphuric acid
Q.4
The formula of methane is CH . Which of these is true?
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A molecule of methane contains five atoms
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A molecule of methane contains five different elements
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An atom of methane contains two different elements
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Methane contains five molecules
Q.5
Which of these is NOT a compound?
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Carbon monoxide
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Chlorine
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Hydrochloric acid
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Propane
Q.6
How many atoms in the formula CuSO ?
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3
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4
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6
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7
Q.7
The correct formula for carbon tetrachloride is .......
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C3Cl
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C4Cl
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CCl3
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CCl4
Q.8
The smallest particle of carbon dioxide (CO ) that still has the properties of carbon dioxide is called .......
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a molecule
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a proton
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an atom
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an ion
Q.9
Which of these word equations is INCORRECT?
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Copper + oxygen → copper oxide
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Hydrogen + chlorine → hydrogen chlorine
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Iron + chlorine → iron chloride
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Magnesium + oxygen → magnesium oxide
Q.10
Which is the correct formula equation?
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Mg + O → MgO
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Mg + O2 → MgO2 →
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2 Mg + O2 → Mg2O2
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2 Mg + O2 → 2 MgO
0 h : 0 m : 1 s
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