$$M = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which subatomic particle determines the atomic number of an element?

Accepted Answer

Proton

Question 2

What does the atomic mass of an atom represent?

Accepted Answer

The total number of protons and neutrons in the nucleus

Question 3

Which electron has higher energy: one in the third electron shell or one in the first electron shell of an atom?

Accepted Answer

Electron in the third shell

Question 4

Which type of molecular bond involves electrons being shared equally between atoms?

Accepted Answer

Nonpolar covalent bond

Question 5

Water molecules are polar because:

Accepted Answer

Oxygen is more electronegative than hydrogen, causing unequal sharing of electrons

Question 6

Which of the following best describes a hydrogen bond?

Accepted Answer

A bond between a slightly positive hydrogen atom and a slightly negative atom on another molecule

Question 7

What is meant by chemical equilibrium in a reaction?

Accepted Answer

The forward and reverse reactions occur at the same rate

Question 8

Which property of water allows it to dissolve many substances, making it a 'universal solvent'?

Accepted Answer

Its ability to form hydrogen bonds

Question 9

Why does ice float on water?

Accepted Answer

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

Question 10

Which equation correctly represents the calculation of molarity ($$M) of a $$solution?

Accepted Answer

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

Question 11

A buffer in biological systems functions to:

Accepted Answer

Maintain a stable pH by neutralizing acids and bases

Question 12

Which of the following is an example of how the structure of a molecule relates to its function?

Accepted Answer

The bent shape and polar nature of water molecules enable hydrogen bonding and solvent properties

Question 13

If a solution contains 0.5 moles of NaCl dissolved in 1 liter of water, what is its molarity?

Accepted Answer

$$0.5\ 	ext{M}$$

Question 14

Which of the following best explains why rising carbon dioxide levels result in ocean acidification?

Accepted Answer

CO$$_2$$ reacts with water to form carbonic acid, which lowers the pH of the ocean

Question 15

In the study by Langdon et al. (2000), what was the dependent variable?

Accepted Answer

The degree of ocean acidification

Question 16

Which of the following is a correct statement about chemical reactants and products?

Accepted Answer

Reactants are the starting materials, and products are the substances formed

Question 17

Which property of water is most responsible for its ability to moderate Earth's climate?

Accepted Answer

High specific heat capacity

Question 18

Which of the following best describes the role of adjacent water molecules sticking together?

Accepted Answer

Cohesion due to hydrogen bonding

Question 19

A calorie is defined as:

Accepted Answer

The amount of energy required to raise the temperature of 1 gram of water by $$1^\circC$$

Question 20

Which of the following is a real-world consequence of water's high surface tension?

Accepted Answer

Small insects can walk on water surfaces

Atoms, Molecular Bonds, and Properties of Water: Study Guide

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