Elements And Atoms In Chemical Compounds

1. How many atoms of Oxygen are in Nitric Acid (HNO₃)?

1 atom

2 atoms

3 atoms

4 atoms

Nitric acid (HNO₃) consists of one hydrogen atom (H), one nitrogen atom (N), and three oxygen atoms (O). The chemical formula indicates the number of each type of atom present in the molecule. Therefore, since there are three oxygen atoms in the formula HNO₃, the answer is three.

Explanation

Nitric acid (HNO₃) consists of one hydrogen atom (H), one nitrogen atom (N), and three oxygen atoms (O). The chemical formula indicates the number of each type of atom present in the molecule. Therefore, since there are three oxygen atoms in the formula HNO₃, the answer is three.

2. In Methane (CH₄), how many Hydrogen atoms are present?

1 atom

2 atoms

3 atoms

4 atoms

Methane (CH₄) is a simple hydrocarbon molecule composed of one carbon atom and four hydrogen atoms. The chemical formula indicates that for every one carbon atom, there are four hydrogen atoms bonded to it. This structure is characteristic of methane, making it a fundamental example of alkanes in organic chemistry. Therefore, the presence of four hydrogen atoms in methane is a defining feature of its molecular composition.

Explanation

Methane (CH₄) is a simple hydrocarbon molecule composed of one carbon atom and four hydrogen atoms. The chemical formula indicates that for every one carbon atom, there are four hydrogen atoms bonded to it. This structure is characteristic of methane, making it a fundamental example of alkanes in organic chemistry. Therefore, the presence of four hydrogen atoms in methane is a defining feature of its molecular composition.

3. In Copper Nitrate Cu(NO₃)₂, how many Nitrogen atoms are there?

1 atom

2 atoms

3 atoms

6 atoms

In Copper Nitrate, represented as Cu(NO₃)₂, the formula indicates that there are two nitrate ions (NO₃) for each copper ion (Cu). Each nitrate ion contains one nitrogen atom. Therefore, with two nitrate ions present, the total number of nitrogen atoms in the compound is 2 (1 nitrogen from each of the 2 nitrate ions).

Explanation

In Copper Nitrate, represented as Cu(NO₃)₂, the formula indicates that there are two nitrate ions (NO₃) for each copper ion (Cu). Each nitrate ion contains one nitrogen atom. Therefore, with two nitrate ions present, the total number of nitrogen atoms in the compound is 2 (1 nitrogen from each of the 2 nitrate ions).

4. How many Oxygen atoms are found in Copper Nitrate Cu(NO₃)₂?

2 atoms

3 atoms

4 atoms

6 atoms

In Copper Nitrate, represented as Cu(NO₃)₂, the formula indicates there are two nitrate ions (NO₃) for each copper ion (Cu). Each nitrate ion contains three oxygen atoms. Therefore, for two nitrate ions, the total number of oxygen atoms is calculated as 2 (NO₃) × 3 (O) = 6 oxygen atoms.

Explanation

In Copper Nitrate, represented as Cu(NO₃)₂, the formula indicates there are two nitrate ions (NO₃) for each copper ion (Cu). Each nitrate ion contains three oxygen atoms. Therefore, for two nitrate ions, the total number of oxygen atoms is calculated as 2 (NO₃) × 3 (O) = 6 oxygen atoms.

5. In Ethanoic Acid (CH₃COOH), the total number of Hydrogen atoms is ____.

Ethanoic acid, also known as acetic acid, has the molecular formula CH₃COOH. In this formula, there are three hydrogen atoms in the methyl group (CH₃) and one hydrogen atom in the carboxyl group (COOH). Adding these together, 3 + 1 equals a total of 4 hydrogen atoms in ethanoic acid.

Explanation

Ethanoic acid, also known as acetic acid, has the molecular formula CH₃COOH. In this formula, there are three hydrogen atoms in the methyl group (CH₃) and one hydrogen atom in the carboxyl group (COOH). Adding these together, 3 + 1 equals a total of 4 hydrogen atoms in ethanoic acid.

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6. Sugar (C₁₂H₂₂O₁₁) contains 12 Carbon atoms.

True

False

Sugar, specifically sucrose, has the chemical formula C₁₂H₂₂O₁₁. In this formula, the "C" represents carbon atoms. The subscript "12" indicates that there are 12 carbon atoms in one molecule of sucrose. Therefore, the statement that sugar contains 12 carbon atoms is accurate, confirming the truth of the assertion.

Explanation

Sugar, specifically sucrose, has the chemical formula C₁₂H₂₂O₁₁. In this formula, the "C" represents carbon atoms. The subscript "12" indicates that there are 12 carbon atoms in one molecule of sucrose. Therefore, the statement that sugar contains 12 carbon atoms is accurate, confirming the truth of the assertion.

7. Match each compound with its correct molecular formula.

Nitric Acid

Methane

Ethanoic Acid

Sugar

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8. Which of the following correctly describes the atom count in Ethanoic Acid (CH₃COOH)?

2 Carbon, 3 Hydrogen, 1 Oxygen

2 Carbon, 4 Hydrogen, 2 Oxygen

1 Carbon, 4 Hydrogen, 2 Oxygen

2 Carbon, 3 Hydrogen, 2 Oxygen

Ethanoic acid, also known as acetic acid, has the chemical formula CH₃COOH. Analyzing this formula reveals that it contains 2 carbon atoms (from the two groups: CH₃ and COOH), 4 hydrogen atoms (3 from CH₃ and 1 from COOH), and 2 oxygen atoms (one from the carbonyl group and one from the hydroxyl group). Thus, the atom count is accurately represented as 2 carbon, 4 hydrogen, and 2 oxygen.

Explanation

Ethanoic acid, also known as acetic acid, has the chemical formula CH₃COOH. Analyzing this formula reveals that it contains 2 carbon atoms (from the two groups: CH₃ and COOH), 4 hydrogen atoms (3 from CH₃ and 1 from COOH), and 2 oxygen atoms (one from the carbonyl group and one from the hydroxyl group). Thus, the atom count is accurately represented as 2 carbon, 4 hydrogen, and 2 oxygen.