Chapter 2 Study Guide

Question 1

Enzymes affect the reactions in living cells by changing the

Answer 1

Speed of the Reaction

Question 2

Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?

Answer 2

A compound

Question 3

If an atom contains 11 protons and 12 neutrons, its atomic number is

Answer 3

11

Question 4

Which of the following makes up a molecule of water?

Answer 4

Two atoms of hydrogen and one atom of oxygen

Question 5

The nucleus is made up of

Answer 5

Nuetrons and protons

Question 6

What type of ion forms when an atom loses electrons?

Answer 6

Positive

Question 7

The most abundant compound in most living things is

Answer 7

Water

Question 8

When hydrogen and oxygen combine to form water, water is

Answer 8

A product

Question 9

A substance with a pH of 6 is called

Answer 9

An acid

Question 10

Isotopes are atoms of the same element with the same number of protons and

Answer 10

Electrons

Question 11

When salt is dissolved in water, water is the

Answer 11

Solvent

Question 12

A covalent bond is formed as the result of

Answer 12

Sharing electrons

Question 13

In chemical reactions, atoms are

Answer 13

Rearranged

Question 14

Identify the reactant(s) in the chemical reaction, CO2 + H2O → H2CO3.

Answer 14

CO2 and H2O

Question 15

What is the main source of energy for living things?

Answer 15

Carbohydrates

Question 16

Solutions that contain concentrations of H+ ions lower than pure water

Answer 16

Are bases

Question 17

A substance that accelerates the rate of a chemical reaction is called a(an)

Answer 17

A catalyst

Question 18

A monosaccharide is a

Answer 18

Carbohydrate

Question 19

What is the term used to describe the energy needed to get a reaction started?

Answer 19

Activation Energy

Question 20

If the pH of stomach acid and of oven cleaner were measured,

Answer 20

The pH of the stomach acid would be below 7, but the pH of the oven cleaner would be above 7

Question 21

What is a form of energy that may be released during a chemical reaction?

Answer 21

Heat

Question 22

What is the process that changes one set of chemicals into another set of chemicals?

Answer 22

Chemical Reactions

Question 23

What type of electron is available to form bonds?

Answer 23

A valence

Question 24

The three particles that make up an atom are

Answer 24

Protons, Neutrons, and Electrons

Question 25

The space surrounding the nucleus of an atom contains

Answer 25

Electrons