Chapter 2

Question 1

atom

Answer 1

The smallest particle of an element

Question 2

atomic mass unit

Answer 2

A unit of mass used to describe atoms and molecules, approximately equal to the mass of a proton or a neutron.

Question 3

Atomic number

Answer 3

The number of protons in an atom, used to identify the element

Question 4

Atomic weight

Answer 4

The average mass of all atoms of an element on Earth

Question 5

Avogadro’s number

Answer 5

The number of particles in one mole

Question 6

Chemical formula

Answer 6

A way to represent the numbers and types of atoms in a chemical compound

Question 7

Chemical substance

Answer 7

A substance that is made from two or more elements in a fixed ratio

Question 8

Electrically neutral atom

Answer 8

An atom that has no electrical charge

Question 9

Electron

Answer 9

A subatomic particle; the negatively charged component of atoms

Question 10

Element

Answer 10

A substance that cannot be broken down into other substances

Question 11

Extensive property

Answer 11

A properties who numerical value depends o the amount of substance, such as mass or volume

Question 12

formula unit

Answer 12

A group of atoms corresponding to a chemical formula

Question 13

Formula weight

Answer 13

The mass of a single formula unit

Question 14

Heterogeneous Mixture

Answer 14

A mixture that contains two or more visibly distinct components

Question 15

Homogeneous Mixture

Answer 15

A mixture in which all components are evenly distributed

Question 16

Intensive property

Answer 16

A measurable property that does not depend on the amount of substance, such as density

Question 17

Isotope

Answer 17

Atoms of the same element that have a different set of neutrons

Question 18

Mass number

Answer 18

The total number of protons and neutrons in an atom

Question 19

matter

Answer 19

anything that has a mass

Question 20

metal

Answer 20

an element or mixture of elements characterized by shiny appearance, ability to be molded without breaking, and conduct heat and electricity

Question 21

Mixture

Answer 21

A combination of two or more substances in which the relative amounts of the substances can be varied

Question 22

mole

Answer 22

An amount of a substance equal to its formula weight expressed in grams: 6.022x10^23

Question 23

neutron

Answer 23

A subatomic particle; the electrically neutral component in atoms

Question 24

noble gas

Answer 24

an element in group 8A

Question 25

non-metal

Answer 25

An element characterized by dull appearance, brittleness,and does not conduct heat or electricity

Question 26

nucleus

Answer 26

The cluster of protons and neutrons at the center of an atom

Question 27

period

Answer 27

The elements in horizontal row of the periodic table

Question 28

periodic table

Answer 28

A table that arranges the chemical elements based on their chemical properties

Question 29

property

Answer 29

anything about matter that can be measured or observed

Question 30

proton

Answer 30

a subatomic particle; the positively charged components of atoms

Question 31

representative element

Answer 31

An element in groups 1A through 2A or 3A through 8A

Question 32

Subatomic particles

Answer 32

A proton, neutron, and electron; one of the three particles that make up an atom