Q: Which of the following is the correct formula to calculate the number of neutrons in an atom?

$$\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}$$

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 qualitative and quantitative data in a biological experiment?

Accepted Answer

Qualitative data involves descriptions or characteristics, while quantitative data involves numerical measurements.

Question 2

A scientist observes that plants grow faster when exposed to blue light. She proposes that blue light increases the rate of photosynthesis. What is this proposed explanation called?

Accepted Answer

A hypothesis

Question 3

Which of the following is the correct formula to calculate the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}$$

Question 4

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

Accepted Answer

Water molecules form strong hydrogen bonds that require more energy to break.

Question 5

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 6

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 7

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 8

A molecule of methane ($$CH_4) $$has which type of covalent bonds?

Accepted Answer

Nonpolar covalent bonds

Question 9

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

Accepted Answer

Cohesion and adhesion due to hydrogen bonding

Question 10

A buffer solution is able to resist changes in pH upon the addition of small amounts of acid or base. Which of the following best explains how a buffer works?

Accepted Answer

A buffer contains a weak acid and its conjugate base, which can absorb excess $$H^+ or$$ $$OH^-$$ ions.

Question 11

Which of the following functional groups is correctly matched with its structure?

Accepted Answer

Carboxyl group: $$-COOH$$

Question 12

Which of the following best describes a nonpolar covalent bond?

Accepted Answer

A bond in which electrons are shared equally between atoms

Question 13

A solution is made by dissolving 0.5 moles of NaCl in enough water to make 1 liter of solution. What is the molarity ($$M) of $$the solution?

Accepted Answer

$$0.5\ M$$

Question 14

Which of the following is an example of a hydrophobic substance?

Accepted Answer

Vegetable oil

Question 15

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

Accepted Answer

Hydrogen bonds in ice create a lattice that is less dense than liquid water.

Question 16

Which of the following is a correct statement about the relationship between heat and temperature?

Accepted Answer

Heat is the total kinetic energy of molecules, while temperature is the average kinetic energy.

Question 17

Which of the following best describes the difference between structural, geometric, and enantiomer isomers?

Accepted Answer

Structural isomers differ in the arrangement of atoms; geometric isomers differ in spatial arrangement around a double bond; enantiomers are mirror images.

Question 18

A chemical reaction is balanced when:

Accepted Answer

The number of atoms of each element is the same on both sides of the equation.

Question 19

Which of the following best explains why evaporative cooling helps organisms maintain a stable temperature?

Accepted Answer

Evaporation removes heat from the surface as the highest energy molecules leave.

Question 20

Which of the following is the correct formula for calculating molarity ($$M$$)?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{volume of solution in liters}}$$

General Biology: Foundations, Chemistry of Life, and Organic Molecules

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