Atom Counting Quiz for Beginners

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Answer explanation

A water molecule, represented as H₂O, contains 2 hydrogen atoms (H) and 1 oxygen atom (O). Therefore, the correct answer is 2.

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Answer explanation

In the chemical formula CO₂, the subscript '2' indicates that there are 2 oxygen atoms present. Therefore, the correct answer is 2.

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Answer explanation

Methane, represented as CH₄, contains one carbon atom (C) and four hydrogen atoms (H). Therefore, the correct answer is 1.

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Answer explanation

A molecule of ammonia, NH₃, contains one nitrogen atom and three hydrogen atoms. Therefore, the correct answer is 1.

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Answer explanation

In the formula C_6H_{12}O_6, the subscript '6' next to 'C' indicates there are 6 carbon atoms. Therefore, the correct answer is 6.

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Answer explanation

In the chemical formula H₂SO₄, there is only one sulfur atom represented by the 'S'. Therefore, the correct answer is 1.

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Answer explanation

A molecule of glucose, C₆H₁₂O₆, contains 6 oxygen atoms, as indicated by the subscript '6' in the chemical formula. Therefore, the correct answer is 6.

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Answer explanation

In the compound NaCl, there is one sodium (Na) atom and one chlorine (Cl) atom. Therefore, the number of chlorine atoms present is 1.

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Answer explanation

Ethanol, represented as C2H5OH, contains 5 hydrogen atoms from the C2H5 part and 1 from the OH group, totaling 6 hydrogen atoms.

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Answer explanation

In the chemical formula P₄O₁₀, the subscript '4' next to phosphorus (P) indicates there are 4 phosphorus atoms. Therefore, the correct answer is 4.