Q: A solution has a pH of 4. What is the concentration of hydrogen ions $[H^+]$ in this solution?

$[H^+] = 1 \times 10^{-4} \text{ M}$

Question 1

Which of the following best describes the difference between independent and dependent variables in a scientific experiment?

Accepted Answer

The independent variable is the variable that is manipulated by the experimenter, while the dependent variable is the variable that is measured as a response.

Question 2

A student is testing the effect of different amounts of sunlight on plant growth. What is the dependent variable in this experiment?

Accepted Answer

Plant growth

Question 3

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring unexpected results

Question 4

Which statement best explains why water is considered a polar molecule?

Accepted Answer

Water has a bent shape and unequal sharing of electrons, resulting in partial charges.

Question 5

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

Accepted Answer

A buffer is a solution that resists changes in pH when acids or bases are added.

Question 6

Which of the following equations correctly represents the dissociation of water?

Accepted Answer

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

Question 7

Which property of water allows insects to walk on its surface?

Accepted Answer

Cohesion due to hydrogen bonding

Question 8

Which of the following is a correct statement about ionic bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in oppositely charged ions.

Question 9

A solution has a pH of 4. What is the concentration of hydrogen ions $[H^+]$ in this solution?

Accepted Answer

$[H^+] = 1 	imes 10^{-4} 	ext{ M}$

Question 10

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

Accepted Answer

Ice has a lower density than liquid water because hydrogen bonds hold water molecules further apart in the solid state.

Question 11

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

Accepted Answer

A covalent bond is formed by the sharing of electron pairs between atoms.

Question 12

Which of the following elements is most likely to form a cation in an ionic bond?

Accepted Answer

Sodium (Na)

Question 13

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is a group of atoms bonded together, which can be the same or different elements; a compound is a molecule made of different elements.

Question 14

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

Accepted Answer

The carbonic acid-bicarbonate system in blood

Question 15

Which of the following best explains why salt (NaCl) dissolves in water?

Accepted Answer

Water molecules surround and separate the Na+ and Cl- ions due to their polarity.

Question 16

Which of the following is the correct electron configuration for a neutral atom of carbon ($C$) with atomic number 6?

Accepted Answer

$1s^2 2s^2 2p^2$

Question 17

Which of the following best describes hydrogen bonding?

Accepted Answer

A hydrogen bond is a weak attraction between a hydrogen atom in one molecule and an electronegative atom in another molecule.

Question 18

Which of the following is a correct statement about the organization of living things?

Accepted Answer

Atoms make up molecules, molecules make up cells, cells make up tissues, tissues make up organs, organs make up organ systems, and organ systems make up organisms.

Question 19

Which of the following is a property of water that helps regulate temperature in living organisms?

Accepted Answer

High specific heat

General Biology Study Notes: Atoms, Chemical Bonds, and Properties of Water

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