Unit 2 Chemistry LLC

Question 1

Atoms

Answer 1

The basic particles of the chemical elements.

Question 2

Molecules

Answer 2

A group of two or more atoms held together by attractive forces known as chemical bonds.

Question 3

Substance

Answer 3

A pure form of matter

Question 4

Homogeneous Mixtures

Answer 4

A gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample

Question 5

Heterogeneous Mixtures

Answer 5

A mixture in which the composition is not uniform throughout the mixture

Question 6

Chemical properties

Answer 6

A property of a substance relating to its chemical reactivity

Question 7

Physical properties

Answer 7

A property (as color, hardness, boiling point) of matter

Question 8

Isotopes

Answer 8

Atoms with the same number of protons but different numbers of neutrons

Question 9

Elements

Answer 9

A basic part of a whole

Question 10

Compounds

Answer 10

A substance made from two or more different elements that have been chemically joined

Question 11

Reactants

Answer 11

A substance that takes part in and undergoes change during a reaction

Question 12

Products

Answer 12

An article or substance that is manufactured or refined for sale

Question 13

Hydrogen Bonds

Answer 13

A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electromotive atom in the other

Question 14

Covalent Bonds

Answer 14

A chemical bond formed when electrons are shared between two atoms.

Question 15

Ionic Bonds

Answer 15

The complete transfer of valence electron(s) between atoms.

Question 16

Cation

Answer 16

Ions that are positively charged.

Question 17

Anion

Answer 17

An ion with negative charge, meaning it has more electrons than protons

Question 18

Periodic Table- groups

Answer 18

A column in the periodic table of the chemical elements.

Question 19

Periodic Table rows

Answer 19

Elements in the same row are in the same period

Question 20

Valence Electrons

Answer 20

A single electron or one of two or more electrons in the outer shell of an atom

Question 21

pH scale

Answer 21

Quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

Question 22

Acids

Answer 22

A chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts

Question 23

Bases

Answer 23

Any substance that in water solution is slippery to the touch, tastes bitter, changes the color of indicators