Question 1

Which of the following best explains why sodium (Na) and chlorine (Cl) atoms form an ionic bond in sodium chloride (NaCl)?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract each other.

Question 2

According to the Octet Rule, atoms tend to interact in such a way that they have how many electrons in their valence shell (excluding the first shell)?

Accepted Answer

$$8$$

Question 3

Which of the following is a property of water that helps maintain temperature homeostasis in the human body?

Accepted Answer

High heat capacity

Question 4

A molecule of carbon dioxide ($$CO_2) is $$described as having which type of covalent bond?

Accepted Answer

Nonpolar covalent bond

Question 5

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak bond formed when a hydrogen atom covalently linked to an electronegative atom is attracted to another electronegative atom.

Question 6

Which of the following chemical reactions is represented by the equation $$AB \rightarrow A + B$$?

Accepted Answer

Decomposition (catabolism)

Question 7

What is the main reason water is considered an excellent solvent for polar and ionic substances?

Accepted Answer

Water molecules have both positive and negative poles, allowing them to form hydration layers around ions.

Question 8

Which factor would most likely increase the rate of a chemical reaction in the human body?

Accepted Answer

Adding an enzyme (biological catalyst)

Question 9

Which of the following best describes the role of salts in the human body?

Accepted Answer

Salts contribute to the hardness of bones and teeth and help transmit nerve impulses.

Question 10

A water molecule ($$H_2O) is $$described as:

Accepted Answer

V-shaped and polar

Question 11

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

Accepted Answer

Hemoglobin unloading carbon dioxide and picking up oxygen in red blood cells

Question 12

Which statement about covalent bonds is correct?

Accepted Answer

Electrons are shared between atoms, allowing each to fill its outer shell.

Question 13

What is the effect of increasing the temperature on the rate of chemical reactions?

Accepted Answer

It increases the kinetic energy of particles, speeding up reactions.

Question 14

Which of the following best describes a reversible chemical reaction?

Accepted Answer

A reaction where chemical bonds can be both made and broken, indicated by a double arrow.

Question 15

Which property of water allows it to act as a cushion for organs such as the brain?

Accepted Answer

Cushioning

Question 16

Which of the following ions is essential for the transmission of nerve impulses and muscle contraction?

Accepted Answer

Sodium ($$Na^+)$$

Question 17

Which of the following best describes the difference between polar and nonpolar covalent bonds?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, resulting in partial charges; nonpolar covalent bonds involve equal sharing.

Question 18

Which of the following best explains why water has a high heat of vaporization?

Accepted Answer

A large amount of energy is required to break the hydrogen bonds between water molecules.

Question 19

Which of the following is true about hydrophilic molecules?

Accepted Answer

They are polar or ionic and interact with water by forming hydrogen bonds.

Chemical Principles in Anatomy & Physiology: Chemical Bonds, Reactions, Water, and Salts

Study Guide - Practice Questions

Study Guide - Flashcards