Chemistry Nine Weeks Exam

Question 1

Always have uniform and definite compositions

Answer 1

Pure substances

Question 2

Chemistry is the study of ——— and the changes it undergoes

Answer 2

Matter

Question 3

Paper burning is an example of a ——— change

Answer 3

Chemical

Question 4

Density is a ——— property of a substance

Answer 4

Physical

Question 5

In a chemical equation the reactants are always written on the___side of the arrow

Answer 5

Left

Question 6

Created the first version of the periodic table

Answer 6

Dmitri Mendeleev

Question 7

Created the current version of the periodic table

Answer 7

Henry Mosley

Question 8

States: when the elements are arranged by atomic number, there is a “periodic” repetition of their physical and chemical properties

Answer 8

Periodic law

Question 9

80% of the elements are

Answer 9

Metals

Question 10

Horizontal rows on the periodic table are called

Answer 10

Periods

Question 11

Vertical columns on the periodic table are called

Answer 11

Groups/families

Question 12

Groups 1A is A.K.A

Answer 12

Alkali metals

Question 13

Group 2A is A.K.A

Answer 13

Alkaline Earth metals

Question 14

Group 7A is A.K.A

Answer 14

Halogens

Question 15

Group 8A is A.K.A

Answer 15

Noble Gases

Question 16

Group B elements are known as the ———

Answer 16

Transition metals

Question 17

When metals bond with nonmetals it is called ——

Answer 17

Ionic bonds

Question 18

When nonmetals bond with nonmetals it is called ——

Answer 18

Covalent bonds

Question 19

Positively charged ions are called ——

Answer 19

Cations

Question 20

Negatively charged ions are called ——

Answer 20

Anions

Question 21

—— bond involve the transfer of electrons

Answer 21

Ionic

Question 22

—— bonds involve the sharing of electrons

Answer 22

Covalent

Question 23

The electrons in the highest occupied energy level of an atom of an element are called ———

Answer 23

Valance electrons

Question 24

The ——— states that as atoms make bonds with other atoms, they fill their outer levels (or lose from their outer level) to make an outer shell with 8 electrons

Answer 24

Octect rule

Question 25

Mass number is the number of —— plus ——

Answer 25

Protons, neutrons

Question 26

Atomic number give us the number of —— and the number of —— in a neutral atom

Answer 26

Protons, electrons

Question 27

—— have high luster and electrical conductivity

Answer 27

Metals

Question 28

——— are brittle and do not conduct electricity

Answer 28

Nonmetals

Question 29

—— are both ductible and malleable

Answer 29

Metals

Question 30

Atomic radius increases as you move LEFT TO RIGHT/ RIGHT TO LEFT and as you move from TOP TO BOTTOM/BOTTOM TO TOP on the period table (state two trends)

Answer 30

Right to left and top to bottom

Question 31

Electronegativity increases as you move from LEFT TO RIGHT/RIGHT TO LEFT and as you move from TOP TO BOTTOM/BOTTOM TO TOP on the period table (state the two trends)

Answer 31

Left to right and bottom to top (does not include noble gases)

Question 32

Ionization energy increases as you move from LEFT TO RIGHT/RIGHT TO LEFT and as you move from TOP TO BOTTOM/BOTTOM TO TOP on the periodic table (state the two trends)

Answer 32

Left to right and bottom to top

Question 33

Atoms that have a positive or negative charge are called ——

Answer 33

Ions