Chemical Formulas

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

Tags

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

Tags

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

Tags

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?

Tags

112.20.b.5.D

Which chemical reaction involves the fewest oxygen atoms?

Tags

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

Tags

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

Tags

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

Tags

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

Tags

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

Tags

112.20.b.5.D