Unit 2 List 1 Chemistry

Question 1

Atoms

Answer 1

the basic building block of chemistry

Question 2

Molecules

Answer 2

a group of atoms bonded together,

Question 3

Substances

Answer 3

kind of matter with uniform properties.

Question 4

Homogenous Mixtures

Answer 4

two or more substances that are distributed with each other

Question 5

Heterogenous Mixtures

Answer 5

composition is not uniform throughout the mixture.

Question 6

Chemical properties

Answer 6

is observed when a substance undergoes a chemical change

Question 7

Physical properties

Answer 7

that can be observed or measured without changing the identity ..

Question 8

Isotopes

Answer 8

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

Question 9

Elements

Answer 9

atoms all have the same number of protons

Question 10

Compounds

Answer 10

composed of many identical molecules containing atoms

Question 11

Reactants

Answer 11

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

bonded to (N). (O). (F).

Question 14

Covalent Bonds

Answer 14

shared electron pairs between atoms

Question 15

Ionic Bonds

Answer 15

atoms are held together by charge.

Question 16

Cation

Answer 16

those that are positively charged

Question 17

Anion

Answer 17

an atom that has more electrons than protons

Question 18

Periodic Table Groups

Answer 18

Groups are numbered 1–18 from left to right

Question 19

Periodic Table Rows

Answer 19

ordered arrangement of the chemical elements into rows and columns.

Question 20

Valence Electrons

Answer 20

the electrons in the outermost shell,

Question 21

PH Scale

Answer 21

measures how acidic a substance is

Question 22

Acids

Answer 22

increase proton concentration in solution,

Question 23

Bases

Answer 23

the bottom support of anything;