Q: Which equation correctly represents the calculation of mass number?

$$\text{Mass number} = \text{Number of protons} + \text{Number of neutrons}$$

Q: Which equation represents chemical equilibrium in a reversible reaction?

$$\text{Rate}_{\text{forward}} = \text{Rate}_{\text{reverse}}$$

Question 1

Which of the following best describes the process of scientific inquiry?

Accepted Answer

Making observations, forming logical hypotheses, and testing them

Question 2

A scientist observes that a plant is wilting. She hypothesizes that the plant needs more water. What is the next logical step in the scientific method?

Accepted Answer

Test the hypothesis by watering the plant and observing the result

Question 3

Which statement about scientific theories is correct?

Accepted Answer

A theory is broader in scope than a hypothesis and is supported by a large body of evidence

Question 4

In a controlled experiment investigating camouflage in mouse populations, which is the independent variable?

Accepted Answer

The color pattern of the mice

Question 5

Which of the following is a trace element required by living organisms in minute quantities?

Accepted Answer

Iron (Fe)

Question 6

What is the atomic number of an element?

Accepted Answer

The number of protons in its nucleus

Question 7

Isotopes of an element differ in which of the following?

Accepted Answer

Number of neutrons

Question 8

Which equation correctly represents the calculation of mass number?

Accepted Answer

$$	ext{Mass number} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 9

Radiometric dating relies on which property of isotopes?

Accepted Answer

The predictable decay rate, expressed as half-life

Question 10

Which of the following best describes a covalent bond?

Accepted Answer

Sharing a pair of valence electrons between two atoms

Question 11

What is the main difference between polar and nonpolar covalent bonds?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons due to differences in electronegativity

Question 12

Which equation represents chemical equilibrium in a reversible reaction?

Accepted Answer

$$	ext{Rate}_{	ext{forward}} = 	ext{Rate}_{	ext{reverse}}$$

Question 13

Which of the following is a real-world application of radioactive isotopes in medicine?

Accepted Answer

Positron emission tomography (PET) scans to detect cancer

Question 14

Which property of water is most directly related to hydrogen bonding?

Accepted Answer

High surface tension

Question 15

Which of the following best explains why opiates and endorphins have similar effects in the brain?

Accepted Answer

Their molecular shapes are similar, allowing them to bind to the same receptors

Question 16

Which of the following is true about the role of enzymes in chemical reactions?

Accepted Answer

Enzymes act as catalysts to increase reaction rates by bringing reactants into close proximity

Question 17

A molecule of sodium chloride (NaCl) is best described as:

Accepted Answer

An ionic compound formed by the attraction of oppositely charged ions

Question 18

Which of the following is a correct statement about valence electrons?

Accepted Answer

Valence electrons are those in the outermost energy shell and determine chemical reactivity

Question 19

Which of the following best describes the importance of diversity in scientific research teams?

Accepted Answer

Diverse backgrounds and viewpoints lead to more robust, valuable, and productive scientific interchange

Question 20

Which of the following is a real-life example of a controlled experiment?

Accepted Answer

Comparing camouflaged and non-camouflaged mice in different environments to measure predation rates

Scientific Inquiry and the Chemistry of Life: General Biology Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards