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

B. H₂SO₄ has more atoms in total than HNO₃

A. Both compounds contain the same number of hydrogen and oxygen atoms

C. HNO₃ contains more sulfur atoms than H₂SO₄

D. The two formulas have identical compositions

12. A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown below. CH₃C₄H₈COH₃ How many atoms of each element are in one molecule of 2-heptanone?

D. 6 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

A. 6 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

B. 7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

C. 7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

16. In a layered liquid density column, a marble sinks to the bottom, while a cork floats on the top. Which conclusion is most accurate?

C. The cork is less dense and the marble is more dense than the liquids

A. The cork is more dense than all the liquids

B. The marble is less dense than all the liquids

D. Both cork and marble are less dense

17. A student compares two elements: Element A: brittle, dull, poor conductor Element B: shiny, malleable, conducts heat well Which conclusion is most accurate?

B. Element A is a nonmetal, Element B is a metal

A. Element A is a metal, Element B is a metalloid

C. Element A is a metalloid, Element B is a nonmetal

D. Element A and B are both nonmetals

19. Why are nonmetals like oxygen and nitrogen essential to modern life?

C. They are essential for life processes like respiration and protein formation

A. They conduct electricity in wiring systems

B. They are used in nuclear fuel and rare magnets

D. They help store and release thermal energy in engines

Matter

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MULTIPLE CHOICE QUESTION

30 sec • 5 pts

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

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

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

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

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

A. 24 atoms

B. 18 atoms

C. 6 atoms

D. 12 atoms

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

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

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

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

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

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

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

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

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Matter

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

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

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

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

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

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

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

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

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

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.

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