Q: A solution is made by dissolving 5 grams of glucose in 95 grams of water. What is the percent concentration of glucose in this solution?

$ \frac{5}{100} \times 100 = 5\% $

Q: A solution has a pH of 3. What is the $[H^+]$ concentration in moles per liter?

$[H^+] = 1 \times 10^{-3} \text{ M}$

Question 1

Which of the following best describes the difference between mixtures and compounds in terms of their separation and bonding?

Accepted Answer

Mixtures do not involve chemical bonding between components and can be separated by physical means, whereas compounds involve chemical bonding and can only be separated by breaking bonds.

Question 2

A solution is made by dissolving 5 grams of glucose in 95 grams of water. What is the percent concentration of glucose in this solution?

Accepted Answer

$ \frac{5}{100} 	imes 100 = 5\% $

Question 3

Which property of water allows it to absorb and release large amounts of heat with little temperature change, thus helping to maintain body temperature?

Accepted Answer

High heat capacity

Question 4

A patient’s blood pH is measured at 7.2. Which of the following statements is correct regarding the hydrogen ion concentration $[H^+]$ compared to normal blood pH (7.4)?

Accepted Answer

$[H^+]$ is higher than normal, indicating acidosis.

Question 5

Which of the following best explains why water is considered the most important inorganic compound in living systems?

Accepted Answer

It makes up 65-80% of cell volume and has unique properties such as high heat capacity and solvent abilities.

Question 6

Which of the following is a correct statement about the structure of ATP?

Accepted Answer

ATP is composed of a ribose sugar, an adenine base, and three phosphate groups.

Question 7

A solution has a pH of 3. What is the $[H^+]$ concentration in moles per liter?

Accepted Answer

$[H^+] = 1 	imes 10^{-3} 	ext{ M}$

Question 8

Which of the following is NOT a function of carbohydrates in the human body?

Accepted Answer

Insulation and protection

Question 9

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have only single bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 10

Which of the following statements about proteins is correct?

Accepted Answer

Proteins are polymers of amino acids, which are joined by covalent peptide bonds.

Question 11

A patient is given a saline solution intravenously. Which component acts as the solvent in this solution?

Accepted Answer

Water

Question 12

Which of the following is a property of colloids that distinguishes them from solutions and suspensions?

Accepted Answer

Colloids have large solute particles that do not settle out and can undergo sol-gel transformations.

Question 13

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

Accepted Answer

Buffers prevent sudden changes in pH by releasing or binding hydrogen ions ($H^+$).

Question 14

Which of the following is a correct pairing of a nucleic acid base with its complementary base in DNA?

Accepted Answer

Adenine (A) pairs with Thymine (T)

Question 15

Which of the following is a function of cholesterol in the human body?

Accepted Answer

It is important in cell membranes, vitamin D synthesis, steroid hormones, and bile salts.

Question 16

A solution contains $1 	ext{ mole}$ of NaCl dissolved in $1 	ext{ liter}$ of water. What is the molarity (M) of the solution?

Accepted Answer

$1 	ext{ M}$

Question 17

Which of the following best explains why organic compounds are considered unique to living systems?

Accepted Answer

They contain carbon, which is electroneutral and forms covalent bonds.

Question 18

Which of the following is a correct statement about denaturation of proteins?

Accepted Answer

Denaturation involves the unfolding and loss of function of globular proteins, often due to changes in pH or temperature.

Question 19

Which of the following best describes the function of ATP in cells?

Accepted Answer

ATP directly powers chemical reactions in cells by transferring phosphate groups to other molecules.

Question 20

Which of the following is a correct statement about the classes of carbohydrates?

Accepted Answer

Disaccharides are composed of two sugar units.

Chemistry Comes Alive: Foundations for Anatomy & Physiology

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