Question 1

Which of the following statements best describes an element?

Accepted Answer

A substance that cannot be chemically changed into any other substance.

Question 2

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 3

What is the charge and location of a neutron in an atom?

Accepted Answer

No charge, located in the nucleus

Question 4

Which of the following best explains why water is a good solvent for both polar and ionic substances?

Accepted Answer

Water molecules have a slightly positive charge on hydrogen and a slightly negative charge on oxygen, allowing them to interact with charged and polar molecules.

Question 5

Which equation correctly represents the dissociation of water into ions?

Accepted Answer

$$H_2O \rightarrow H^+ + OH^-$$

Question 6

A solution has a pH of 4. Which of the following statements is true?

Accepted Answer

The solution is acidic and has a high concentration of $$H^+$$ ions.

Question 7

Which of the following best describes a buffer in biological systems?

Accepted Answer

A substance that maintains pH by quickly absorbing or releasing $$H^+$$ ions.

Question 8

If the blood pH drops below 7.35, which of the following physiological responses is most likely to occur?

Accepted Answer

Buffers will absorb excess $$H^+$$ ions to restore pH to normal.

Question 9

Which of the following is a consequence of ocean acidification due to increased $$CO_2$$ levels?

Accepted Answer

Decrease in the availability of carbonate ions, leading to fewer shells and hard parts.

Question 10

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges on atoms.

Question 11

Which of the following is true about the structure of an atom?

Accepted Answer

Protons and neutrons are located in the nucleus, while electrons orbit around the nucleus.

Question 12

Which of the following is a feature of water that allows life to continue under frozen surfaces?

Accepted Answer

Water molecules spread out when frozen, decreasing density and allowing ice to float.

Question 13

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

Accepted Answer

Hydrogen bonds between water molecules require more energy to break, resulting in high specific heat.

Question 14

Which of the following is the correct definition of homeostasis?

Accepted Answer

The process by which organisms maintain a constant internal environment despite external changes.

Question 15

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

Accepted Answer

The bicarbonate buffer system that maintains blood pH.

Question 16

Which of the following molecules is non-polar?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 17

Which of the following best describes the role of protons in determining atomic number?

Accepted Answer

The atomic number is equal to the number of protons in the atom.

Question 18

A patient is experiencing hypothermia. Which concept explains the body's attempt to maintain a stable internal temperature?

Accepted Answer

Homeostasis

Question 19

Which of the following is true about acids and bases?

Accepted Answer

Acids donate $$H^+$$ ions and bases accept $$H^+$$ ions.

Chemistry of Biology: Foundations for General Chemistry

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