Q: Which of the following is the correct calculation for the atomic mass number of an atom?

$$\text{Atomic mass number} = \text{Number of protons} + \text{Number of neutrons}$$

Question 1

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons from one atom to another, resulting in oppositely charged ions that attract each other, while a covalent bond involves the sharing of electrons between atoms.

Question 2

A patient is found to have a blood pH of 7.1. Which of the following statements is correct regarding this condition?

Accepted Answer

The blood is considered acidic and the patient is experiencing acidosis.

Question 3

Which of the following is the correct formula for the chemical reaction of cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O$$

Question 4

Which property of water allows it to help regulate body temperature?

Accepted Answer

High heat capacity

Question 5

A solution is made by dissolving salt in water. In this scenario, which is the solvent and which is the solute?

Accepted Answer

Water is the solvent, salt is the solute.

Question 6

Which of the following best explains why noble gases are considered inert?

Accepted Answer

They have a full valence shell of electrons, making them unlikely to react with other elements.

Question 7

Which of the following is true about isotopes of an element?

Accepted Answer

They have the same number of protons but a different number of neutrons.

Question 8

Which of the following best describes the function of enzymes in the body?

Accepted Answer

Enzymes act as catalysts, speeding up chemical reactions by lowering activation energy.

Question 9

A molecule of water (H$$_2O) is $$described as polar. What does this mean in terms of its molecular structure?

Accepted Answer

The molecule has a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom.

Question 10

Which of the following best describes the difference between a colloid and a suspension?

Accepted Answer

A colloid contains large particles that do not settle, while a suspension contains larger particles that do settle over time.

Question 11

Which of the following is the correct calculation for the atomic mass number of an atom?

Accepted Answer

$$	ext{Atomic mass number} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 12

Which of the following best explains why electrolytes are important in the human body?

Accepted Answer

They help conduct electrical currents necessary for nerve and muscle function.

Question 13

Which of the following is an example of a decomposition reaction in the body?

Accepted Answer

$$AB \rightarrow A + B$$

Question 14

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids release H$$^+$$ ions in solution.

Question 15

A patient is given an intravenous solution containing NaCl. What happens to the NaCl when it dissolves in water?

Accepted Answer

NaCl dissociates into Na$$^+$$ and Cl$$^-$$ ions, which become electrolytes.

Question 16

Which of the following best describes the role of water in hydrolysis reactions?

Accepted Answer

Water is added to break down molecules into smaller components.

Question 17

Which of the following is a correct statement about the relationship between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, while weight is mass multiplied by gravity.

Question 18

Which of the following best explains why the outermost electron shell (valence shell) is important in chemical reactions?

Accepted Answer

It determines the atom's ability to react and form bonds with other atoms.

Question 19

Which of the following is an example of a synthesis (anabolic) reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 20

Which of the following best describes a hydrophilic molecule?

Accepted Answer

A molecule that is attracted to water and dissolves easily in it.

Chemical Level of Organization: Atoms, Molecules, Compounds, and Water in Physiology

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