Q: Which of the following equations correctly represents the calculation of atomic weight?

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

Question 1

Which of the following elements is considered a major body element and is essential for the formation of proteins and nucleic acids in the human body?

Accepted Answer

Nitrogen

Question 2

A solution is prepared by dissolving 10 grams of NaCl in 100 mL of water. Which term best describes this mixture?

Accepted Answer

Solution

Question 3

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from one atom to another

Question 4

A patient is given a medication that acts as a catalyst for a metabolic reaction. What effect will this have on the reaction rate?

Accepted Answer

The reaction rate will increase because catalysts lower the activation energy.

Question 5

Which of the following equations correctly represents the calculation of atomic weight?

Accepted Answer

$	ext{Atomic weight} = 	ext{Number of protons} + 	ext{Number of neutrons}$

Question 6

A solution has a pH of 3. Which of the following statements is true about this solution?

Accepted Answer

It is an acidic solution.

Question 7

Which of the following best describes a colloid?

Accepted Answer

A heterogeneous mixture with large particles that do not settle out

Question 8

Which of the following chemical bonds is most likely to be found in water (H$_2$O) molecules?

Accepted Answer

Polar covalent bond

Question 9

If the concentration of H$^+$ ions in a solution is $1 	imes 10^{-7}$ M, what is the pH of the solution?

Accepted Answer

$7$

Question 10

Which of the following factors will NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the concentration of reactants

Question 11

A patient is suffering from alkalosis. Which of the following pH values is most consistent with this condition?

Accepted Answer

$7.6$

Question 12

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

Accepted Answer

They act as catalysts to speed up biochemical reactions.

Question 13

Which of the following is a real-life example of a suspension in the human body?

Accepted Answer

Red blood cells in whole blood

Question 14

A chemical reaction in the body is proceeding slowly. Which of the following changes would most likely speed up the reaction?

Accepted Answer

Adding an enzyme

Question 15

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

Accepted Answer

Acids have a pH less than 7.

Question 16

Which of the following is a correct example of a covalent bond?

Accepted Answer

H$_2$

Question 17

A student mixes oil and water in a beaker. After shaking, the oil forms droplets suspended in the water. This mixture is best described as:

Accepted Answer

An emulsion

Question 18

Which of the following best describes the relationship between temperature and reaction rate in the human body?

Accepted Answer

As temperature increases, reaction rate increases up to an optimal point.

Question 19

Which of the following is a major misconception about polar covalent bonds?

Accepted Answer

They are the same as ionic bonds.

Question 20

A buffer is added to a solution to maintain its pH. Which of the following best explains how a buffer works?

Accepted Answer

It minimizes changes in pH by accepting or donating H$^+$ ions as needed.

Basic Chemistry Concepts for Anatomy & Physiology

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