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

• NH₄Cl + KOH --> NH₃ + H₂O + KCl

• 2Na + 2H₂O --> 2NaOH + H₂

• 2C₂H₆ + 7O₂ --> 4CO₂ + 6H₂O

• 4Fe + 3O₂ --> 2Fe₂O₃

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112.20.b.5.D

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

• Phosphoric acid

• Sulfuric acid

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112.20.b.5.D

A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is:

CH₃C₄H₈COCH₃

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

​ (a)   carbon atoms, ​ (b)   hydrogen atoms, and ​ (c)   oxygen atom

• 7
• 14
• 1
• 6
• 11
• 8

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112.20.b.5.D

Barium sulfate, BaSO₄, is a white crystalline solid that is insoluble in water. It is used by doctors to diagnoze problems with the digestive system. Barium hydroxide, Ba(OH)₂, is also a white crystalline solid and is used in wastewater treatment.

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

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112.20.b.5.D

Which chemical reaction involves the fewest oxygen atoms?

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112.20.b.5.D

The table lists some compounds found in foods and their formulas.

Based on this information, which of these statements in NOT true?

• A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does

• A molecule of lactose contains twice as many atoms as a molecule of fructose does

• A molecule of fructose contains four more atoms than a molecule of glutamine does

• A molecule of lactose contains twice as many carbon atoms as a molecule or sorbitol does

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112.20.b.5.D

A student is using colored beads to make a model of aluminum sulfate, Al₂(SO₄)₃. Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads.

What combination of beads should the student use for the model?

​ (a)   blue, ​ (b)   yellow, and ​ (c)   green

• 2
• 3
• 12
• 6
• 7
• 1
• 4

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112.20.b.5.D

Strontium phosphate, Sr₃(PO₄)₂, is a crystalline substance used in medicine and industry. How many phosphorous atoms are represented in the formula for Sr₃(PO₄)₂?

• 2

• 3

• 4

• 8

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112.20.b.5.D

The table shows the chemical formulas for four substances.

Which substances have the same number of carbon atoms?

• Substances 1 and 2

• Substances 2, 3, and 4

• Substances 2 and 3 only

• Substances 1 and 3

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112.20.b.5.D

Which of these formulas contain equal numbers of nitrogen atoms?

• Formulas I and III

• Formulas I and IV

• Formulas II and III

• Formulas I, II, and V

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112.20.b.5.D