STAAR Review Warm-Up 7.6B Conservation of Mass/Formulas

The chemical formula for methane is CH₄. Which statement describes the atoms present in FOUR molecules of methane?

• Four molecules of methane would contain 1 atom of carbon and 4 atoms of hydrogen.

• Four molecules of methane would contain 4 atoms of carbon and 1 atom of hydrogen.

• Four molecules of methane would contain 4 atoms of carbon and 16 atoms of hydrogen.

• Four molecules of methane would contain 16 atoms of carbon and 16 atoms of hydrogen.

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NGSS.MS-PS1-1

Sodium sulfate (Na₂SO₄) is used to produce many products. Which elements are represented in the formula AND how many atoms of each element are represented in the formula? Read the question carefully. Then enter your answer in the box provided.

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NGSS.MS-PS1-1

Oxygen and oxygen-containing compounds are involved in many different reactions. Which balanced equation represents a reaction that involves 14 atoms of oxygen?

• NH₄Cl + KOH → NH₃ + H₂O + KCl

• 2Na + 2H₂O → 2NaOH + H₂

• 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

• 4Fe + 3O₂ → 2Fe₂O₃

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NGSS.MS-PS1-5

The names and chemical formulas of four substances are shown in the chart.

Which substance listed in the chart is made up of the most atoms?

• Carbonic acid

• Nitric acid

• Sulfuric acid

• Phosphoric acid

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NGSS.MS-PS1-1

How many atoms of each element are in one molecule of 2-heptanone?

• 4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

• 6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms

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NGSS.MS-PS1-1

CaCO₃ represents a chemical

• Symbol
• Formula
• Subscript
• Reaction

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NGSS.MS-PS1-1

How many more oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide?

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NGSS.MS-PS1-1