Chemistry Quiz

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

• 2

• 3

• 4

• 8

Tags

7.6 B Counting Atoms

How many elements are present in the chemical formula shown? MgO

• 0

• 1

• 2

• 4

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7.6 B Counting Atoms

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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7.6 B Counting Atoms

The chemical formula for sodium sulfate is Na₂SO₄. How many sulfur atoms are in the formula for sodium sulfate?

• 1

• 2

• 6

• 7

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7.6B Counting Atoms

The table shows the chemical formulas for four substances. Which substances have the same number of carbon atoms?

• 1. Substances 1 and 2

• Substances 2, 3, and 4

• Substances 2 and 3

• Substances 1 and 3

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7.6B Counting Atoms

The table lists some compounds found in foods and their formulas. Based on this information, which of these statements is not true?

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

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

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

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

Tags

7.6B Counting Atoms

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. How many would you need of each bead to make a model of aluminum sulfate?

• 6 blue, 3 yellow, and 7 green

• 2 blue, 1 yellow, and 4 green

• 2 blue, 3 yellow, and 12 green

• 6 blue, 12 yellow, and 12 green

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7.6B Counting Atoms

Serotonin is a chemical substance that acts as a neurotransmitter. It helps relay messages in the human

brain. The formula for one molecule of serotonin is shown below.

C ₁₀ H ₁₂ N ₂ O

How many TOTAL atoms are in one molecule of serotonin?

(Include only the number)

Mathematical Equivalence

ON

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7.6B

Counting

Atoms

How many atoms of OXYGEN are in a molecule of glucose, C₆H₁₂O₆? Record your answer and fill in the bubbles below.

• 4

• 5

• 6

• 7

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7.6B

Counting

Atoms

Mathematical Equivalence

ON

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8.6E Law conservation of mass