Question 1

Which information could a student determine from only the chemical formula of a protein?

Accepted Answer

The number of atoms of each element in the protein

Answer

The physical arrangement of atoms in the structure of the protein

Answer

The color of the protein

Answer

The number of molecules in each sequence that makes up a protein

Question 2

How many atoms of oxygen are in a molecule of glucose ($C_{6}H_{12}O_{6}$)? Be sure to use the correct place value.

Accepted Answer

6

Question 3

Which of these formulas contain equal numbers of nitrogen atoms?

Accepted Answer

Formulas I, II, and V

Answer

Formulas I and III

Answer

Formulas II and III

Answer

Formulas I and IV

Question 4

The equation below represents a chemical reaction that occurs in living cells. 
$C_{6}H_{12}O_{6}$ + $6O_{2}$ ⎯⎯→ $6CO_{2}$ + $6H_{2}O$ + energy
How many atoms are represented in the reactants of this equation?

Accepted Answer

36

Answer

24

Answer

6

Answer

12

Question 5

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

Accepted Answer

$H_{2}SO_{4}$

Answer

$H_{3}PO_{4}$

Answer

$H_{2}O$

Answer

$HClO_{3}$

Question 6

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 7

A student is using colored beads to make a model of aluminum sulfate, $Al_{2}(SO_{4})_{3}$. 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?

Accepted Answer

2 blue, 3 yellow, and 12 green

Answer

6 blue, 3 yellow, and 7 green

Answer

2 blue, 1 yellow, and 4 green

Answer

6 blue, 12 yellow, and 12 green

Question 8

The chemical formula for sodium sulfate is $Na_{2}SO_{4}$ . How many sulfur atoms are in the formula for sodium sulfate?

Accepted Answer

1

Answer

6

Answer

7

Answer

2

Question 9

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 atoms in all are in a molecule of serotonin? Be sure to use the correct place value.

Accepted Answer

25

Question 10

Strontium phosphate, $Sr_{3(}PO){4})_{2}$ is a crystalline substance used in medicine and industry. How many phosphorus atoms are represented in the formula for $Sr_{3}(PO_{4})_{2}$ ?

Accepted Answer

2

Answer

8

Answer

3

Answer

4

Question 11

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

Accepted Answer

Substances 1 and 3

Answer

Substances 2 and 3 only

Answer

Substances 2, 3, and 4

Answer

Substances 1 and 2

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