Question 1

Which of the following statements best describes the difference between atomic number and atomic weight?

Accepted Answer

Atomic number is the number of protons in an atom, while atomic weight is the sum of protons and neutrons.

Question 2

A carbon atom has 6 protons and 7 neutrons. What is its atomic weight?

Accepted Answer

$$13$$

Question 3

Which of the following best explains why water has a moderating influence on temperature?

Accepted Answer

Water has a high specific heat, high heat of vaporization, and high heat of fusion.

Question 4

What is the correct formula to convert a temperature from Celsius to Fahrenheit?

Accepted Answer

$$F = \frac{9}{5}C + 32$$

Question 5

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 6

How many electrons can the first energy level (K shell) of an atom hold?

Accepted Answer

$$2$$

Question 7

Which of the following is a property of a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges.

Question 8

What is the molecular weight of methane ($$CH_4$$)? (Atomic weights: C = 12, H = 1)

Accepted Answer

$$16$$

Question 9

Which of the following best describes a hydrogen bond?

Accepted Answer

A bond between a hydrogen atom with a partial positive charge and an atom with a partial negative charge on another molecule.

Question 10

If the concentration of $$[H^+] in a $$solution is $$10^{-5} M$$, what is the pH of the solution?

Accepted Answer

$$5$$

Question 11

Which of the following is true about the ionization of water?

Accepted Answer

Water ionizes to form $$H_3O^+$$ and $$OH^-$$ ions.

Question 12

Which of the following best describes the term 'molecule'?

Accepted Answer

A structure of two or more atoms joined by chemical bonds.

Question 13

What is the main reason sodium chloride ($$NaCl) $$dissolves easily in water?

Accepted Answer

Water is a polar solvent and stabilizes ions.

Question 14

Which of the following is NOT a property of water that contributes to its importance for life?

Accepted Answer

Low specific heat.

Question 15

What is the correct relationship between $$[H^+]$$ and $$[OH^-] in $$pure water at 25°C?

Accepted Answer

$$[H^+] = [OH^-] = 10$$^{-7}$$ \, M$

Question 16

Which of the following best describes electronegativity?

Accepted Answer

The ability of an atomic nucleus to attract electrons.

Question 17

Which of the following is a correct statement about covalent bonds?

Accepted Answer

Covalent bonds are formed by the sharing of electron pairs between atoms.

Question 18

A solution is made by dissolving 58.5 g of NaCl in enough water to make 1 liter of solution. What is the molarity of the solution? (Molecular weight of NaCl = 58.5 g/mol)

Accepted Answer

$$1$$ \, M$

Question 19

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

Accepted Answer

Cohesion is the attraction of molecules to the same kind, adhesion is attraction to different kinds.

Atoms, Molecules, and the Chemical Context of Life: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards