Question 1

Which of the following statements best explains why water has a high specific heat compared to most other substances?

Accepted Answer

The hydrogen bonds between water molecules absorb significant energy before breaking.

Question 2

A scientist is studying a molecule with the formula $$C_6H_{12}O_6$. Which of the following best describes this molecule?

Accepted Answer

It is a molecular formula for a monosaccharide.

Question 3

Which property of water allows insects to walk on its surface, and is primarily due to the attraction between water molecules?

Accepted Answer

Cohesion

Question 4

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

Accepted Answer

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

Question 5

Which of the following best describes the difference between an isotope and an element?

Accepted Answer

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

Question 6

Which functional group is most likely to make a molecule hydrophilic and increase its solubility in water?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 7

A molecule has a polar covalent bond. Which of the following statements best describes the bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges.

Question 8

Which of the following best describes a condensation reaction?

Accepted Answer

A reaction in which two monomers are joined together and water is released.

Question 9

Which law of thermodynamics states that energy cannot be created or destroyed, only transformed?

Accepted Answer

First law of thermodynamics

Question 10

A buffer solution is important in biological systems because it:

Accepted Answer

Resists changes in pH when acids or bases are added.

Question 11

Which of the following best describes the difference between potential and kinetic energy?

Accepted Answer

Potential energy is stored energy, while kinetic energy is energy of motion.

Question 12

Which of the following is a real-life example of an ionic bond?

Accepted Answer

The bond between sodium and chloride in table salt ($$NaCl).$$

Question 13

Which property of water explains why ice floats on liquid water?

Accepted Answer

Water's lower density as a solid compared to its liquid form

Question 14

Which of the following best describes a hydrolysis reaction?

Accepted Answer

A reaction in which water is added to break a polymer into monomers.

Question 15

Which of the following statements about van der Waals forces is correct?

Accepted Answer

They are weak attractions between molecules due to temporary dipoles.

Question 16

A molecule has the following structural formula: $$H_2N-CH_2$-COOH. $$Which functional groups are present?

Accepted Answer

Amino and carboxyl

Question 17

Which of the following best describes the role of valence electrons in chemical bonding?

Accepted Answer

Valence electrons are involved in forming chemical bonds between atoms.

Question 18

Which scenario best illustrates a spontaneous reaction according to the laws of thermodynamics?

Accepted Answer

A reaction that increases entropy and releases energy.

Question 19

Which of the following statements about monomers and polymers is correct?

Accepted Answer

Polymers are formed by joining monomers through condensation reactions.

Question 20

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil molecules are hydrophobic and do not interact with water's polar molecules.

Chapter 2: Water and Carbon – The Chemical Basis of Life (Study Notes)

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