Q: Which of the following is the correct formula for calculating the atomic mass of an element?

$$\text{Atomic Mass} = \text{Number of Protons} + \text{Number of Neutrons}$$

Q: Which of the following is a correct representation of the chemical equilibrium in a reversible reaction?

$$\text{A} + \text{B} \leftrightarrow \text{C} + \text{D}$$

Q: Which of the following is the correct formula for calculating the number of neutrons in an atom?

$$\text{Number of Neutrons} = \text{Atomic Mass} - \text{Atomic Number}$$

Question 1

Which of the following best describes a dependent variable in a scientific experiment?

Accepted Answer

It is the variable that is measured to assess the effect of the independent variable.

Question 2

Charles Darwin's theory of evolution by natural selection is supported by which of the following observations?

Accepted Answer

Organisms with traits better suited to their environment tend to survive and reproduce more successfully.

Question 3

Which of the following is the correct formula for calculating the atomic mass of an element?

Accepted Answer

$$	ext{Atomic Mass} = 	ext{Number of Protons} + 	ext{Number of Neutrons}$$

Question 4

A scientist wants to determine the age of a fossil using radioactive dating. Which isotope is commonly used for dating fossils older than 50,000 years?

Accepted Answer

Uranium-238

Question 5

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.

Question 6

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains a stable pH by neutralizing excess acids or bases.

Question 7

Which of the following is a correct representation of the chemical equilibrium in a reversible reaction?

Accepted Answer

$$	ext{A} + 	ext{B} \leftrightarrow 	ext{C} + 	ext{D}$$

Question 8

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

Accepted Answer

Surface tension due to hydrogen bonding

Question 9

A patient is diagnosed with acidosis. Which of the following best describes what is happening in their blood?

Accepted Answer

The pH of the blood is lower than normal due to increased hydrogen ion concentration.

Question 10

Which functional group is found in amino acids and is essential for protein structure?

Accepted Answer

Carboxyl group

Question 11

How many electrons are found in the outer shell of a carbon atom?

Accepted Answer

4

Question 12

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

Accepted Answer

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

Question 13

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of Neutrons} = 	ext{Atomic Mass} - 	ext{Atomic Number}$$

Question 14

Which of the following molecules is most likely to form hydrogen bonds with water?

Accepted Answer

Ammonia ($$	ext{NH}_3)$$

Question 15

Which of the following best describes the role of ATP in cells?

Accepted Answer

ATP provides energy for cellular processes.

Question 16

A scientist measures the concentration of a solution in moles. Which formula should they use to convert moles to molecules?

Accepted Answer

$$	ext{Number of molecules} = 	ext{Moles} 	imes 6.022 	imes 10$$^{23}$$

Question 17

Which of the following best explains why ocean acidification is a concern for marine life?

Accepted Answer

It decreases the availability of carbonate ions needed for shell formation.

Question 18

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

Accepted Answer

The bond between two hydrogen atoms in a hydrogen molecule ($$	ext{H}_2).$$

Question 19

Which of the following best describes the difference between cohesion and adhesion?

Accepted Answer

Cohesion is the attraction between molecules of the same substance; adhesion is the attraction between molecules of different substances.

Question 20

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Water has a partial positive charge on hydrogen and a partial negative charge on oxygen.

General Biology: Foundations, Chemistry, Water, and Organic Molecules

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