Question 1

Which of the following statements best explains why ice floats on liquid water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds hold water molecules further apart in the solid state.

Question 2

Which equation correctly represents the dissociation of water into ions?

Accepted Answer

$$ \mathrm{H_2O} \rightarrow \mathrm{H^+} + \mathrm{OH^-} $$

Question 3

A neutral atom of sodium ($$ \mathrm{Na} ) $$has 11 protons. How many electrons does it have?

Accepted Answer

11

Question 4

Which property of water allows it to move upward through the stem of a plant against gravity?

Accepted Answer

Cohesion and adhesion working together to create capillary action

Question 5

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

Accepted Answer

A substance that resists changes in pH by releasing or absorbing hydrogen ions

Question 6

Which of the following is true about ionic bonds?

Accepted Answer

They are formed by the attraction between oppositely charged ions after the transfer of electrons.

Question 7

A solution has a hydrogen ion concentration of $$ 1 	imes 10$$^{-4}$$ $$ mol/L. What is its pH?

Accepted Answer

4

Question 8

Which of the following elements is NOT one of the four most abundant in living organisms?

Accepted Answer

Sodium (Na)

Question 9

What is the main reason water is considered a good solvent for ionic and polar substances?

Accepted Answer

Water molecules are polar and can surround and separate charged ions and polar molecules.

Question 10

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object and does not change with location, while weight is the force of gravity acting on that mass and can change depending on location.

Question 11

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 12

Which type of chemical bond is responsible for the unique properties of water, such as high surface tension and specific heat?

Accepted Answer

Hydrogen bonds

Question 13

What happens to the pH of blood if a person hyperventilates and removes too much $$ \mathrm{CO_2$} $$ from their body?

Accepted Answer

The pH increases, making the blood more basic.

Question 14

Which of the following best describes a redox reaction?

Accepted Answer

A chemical reaction in which electrons are transferred from one atom to another, resulting in oxidation and reduction.

Question 15

Which of the following molecules would be considered hydrophobic?

Accepted Answer

A nonpolar molecule such as oil

Question 16

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

Accepted Answer

Hydrogen bonds between water molecules require a large amount of energy to break.

Question 17

Which of the following is true about covalent bonds?

Accepted Answer

They are formed when atoms share one or more pairs of electrons.

Question 18

A molecule of $$ \mathrm{O_2$}  is $$held together by which type of bond?

Accepted Answer

Double covalent bond

Question 19

Which of the following best describes electronegativity?

Accepted Answer

An atom’s affinity for electrons in a chemical bond

Question 20

Which of the following is a real-life example of van der Waals interactions?

Accepted Answer

Antibody-antigen binding in the immune system

The Nature of Molecules and the Properties of Water: Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드