Matter

1. Analyze the chemical formula CaCl₂. How many atoms of each element are present in one molecule of this formula?

• A. 1 calcium, 1 chlorine
• B. 1 calcium, 2 chlorine
• C. 2 calcium, 2 chlorine
• D. 2 calcium, 1 chlorine

2. Which statement correctly compares the number of atoms in H₂O, CO₂, and NH₃?

• A. All three have the same number of atoms
• B. NH₃ has the most atoms in its formula
• C. CO₂ has more atoms than H₂O but fewer than NH₃
• D. H₂O has more atoms than CO₂ and NH₃

3. Identify the total number of atoms in the following formula: C₆H₁₂O₆

• A. 24 atoms
• B. 18 atoms
• C. 6 atoms
• D. 12 atoms

4. Compare the formulas NaCl and MgCl₂. Which of the following statements is true?

• A. Both formulas have the same total number of atoms
• B. NaCl has more atoms than MgCl₂
• C. MgCl₂ contains one atom of magnesium and two atoms of chlorine
• D. NaCl contains two atoms of sodium and two atoms of chlorine

5. Analyze the following equation: 2H₂ + O₂ → 2H₂O How many total atoms are on each side of the equation?

• A. 6 on the left, 4 on the right
• B. 4 on the left, 6 on the right
• C. 6 on the left, 6 on the right
• D. 2 on the left, 2 on the right

6. Examine the formula Al₂(SO₄)₃. How many atoms of each element are in this formula?

• A. Al: 2, S: 3, O: 12
• B. Al: 1, S: 3, O: 4
• C. Al: 2, S: 1, O: 3
• D. Al: 3, S: 2, O: 4

7. Which pair of formulas contains the same number of total atoms?

• A. CO₂ and CH₄
• B. HCl and NH₃
• C. NaOH and H₂O
• D. MgO and MgCl₂

8. A student compares H₂SO₄ and HNO₃. Which conclusion is correct based on the number and type of atoms?

• A. Both compounds contain the same number of hydrogen and oxygen atoms
• B. H₂SO₄ has more atoms in total than HNO₃
• C. HNO₃ contains more sulfur atoms than H₂SO₄
• D. The two formulas have identical compositions

9. Which formula below contains the greatest total number of atoms?

• A. CH₄
• B. C₂H₆
• C. CO₂
• D. NH₃

10. The names and chemical formulas of four substances are shown below in the chart. Which substances listed in the chart are made up of the most oxygen atoms? Select 2 correct answers.

• Carbonic Acid
• Nitric Acid
• Phosphoric Acid
• Sulfuric Acid
• All Substances