Q: A solution is prepared by dissolving 10 grams of NaCl in enough water to make 1 liter of solution. What is the molarity (M) of NaCl in the solution? (Molecular weight of NaCl = 58.44 g/mol)

$$M = \frac{10}{58.44} = 0.171\ \text{mol/L}$$

Q: A patient is given a solution containing 180 mg/dL of glucose. What is the concentration in g/L?

$$180\ \text{mg/dL} \times 10 = 1800\ \text{mg/L} = 1.8\ \text{g/L}$$

Q: Which of the following is true regarding Avogadro's number?

It is $$6.02 \times 10$$^{23}$$, representing the number of molecules in one mole of a substance.

Question 1

Which of the following best describes the difference between potential energy and kinetic energy in the context of human physiology?

Accepted Answer

Potential energy is energy stored in chemical bonds, while kinetic energy is energy resulting from movement of charged particles.

Question 2

Which of the following is NOT one of the four elements that make up 99% of the human body?

Accepted Answer

Calcium

Question 3

A solution is prepared by dissolving 10 grams of NaCl in enough water to make 1 liter of solution. What is the molarity (M) of NaCl in the solution? (Molecular weight of NaCl = 58.44 g/mol)

Accepted Answer

$$M = \frac{10}{58.44} = 0.171\ 	ext{mol/L}$$

Question 4

Which statement about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but differ in the number of neutrons.

Question 5

Which type of chemical bond involves the sharing of two pairs of electrons between two atoms?

Accepted Answer

Double covalent bond

Question 6

A patient is given a solution containing 180 mg/dL of glucose. What is the concentration in g/L?

Accepted Answer

$$180\ 	ext{mg/dL} 	imes 10 = 1800\ 	ext{mg/L} = 1.8\ 	ext{g/L}$$

Question 7

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in unequal sharing of electrons.

Question 8

Which of the following is an example of an exergonic chemical reaction in the human body?

Accepted Answer

The breakdown of glucose during cellular respiration

Question 9

Which statement about the octet rule is correct?

Accepted Answer

Atoms will gain, lose, or share electrons to achieve stability of 8 electrons in their valence shell.

Question 10

Which of the following mixtures is classified as a suspension?

Accepted Answer

A mixture of water and sand

Question 11

What is the atomic number of an element, and how is it determined?

Accepted Answer

The atomic number is the number of protons in the nucleus of an atom.

Question 12

Which of the following best describes a colloid?

Accepted Answer

A heterogeneous mixture with solute particles that do not settle out

Question 13

Which of the following is true regarding Avogadro's number?

Accepted Answer

It is $$6.02 	imes 10$$^{23}$$, representing the number of molecules in one mole of a substance.

Question 14

Which of the following is a correct statement about ions?

Accepted Answer

Anions are atoms that have gained one or more electrons and have a negative charge.

Question 15

Which of the following best describes a synthesis (combination) reaction?

Accepted Answer

Two or more atoms or molecules combine to form a larger, more complex molecule.

Question 16

Which of the following is the correct molecular formula for glucose?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$

Question 17

Which of the following is NOT a type of chemical bond?

Accepted Answer

Electrostatic bond

Question 18

Which of the following best explains the role of electrons in chemical bonding?

Accepted Answer

Electrons in the valence shell are involved in chemical reactions and bond formation.

Question 19

Which of the following is a correct statement about chemical reactions in living systems?

Accepted Answer

Oxidation-reduction reactions involve the transfer of electrons between molecules.

Basic Chemistry for Anatomy & Physiology

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