Science Ch 20 Test

Question 1

A charged group of atoms

Answer 1

Polyatomic ion

Question 2

A compound composed of two elements

Answer 2

Binary compound

Question 3

A molecule with partially charged areas

Answer 3

Polar molecule

Question 4

A positively or negatively charged particle

Answer 4

Ion

Question 5

A chemical bond between oppositely charged ions

Answer 5

Ionic bond

Question 6

A bond formed from shared electrons

Answer 6

Covalent bond

Question 7

Crystalline substance that contains water

Answer 7

Hydrate

Question 8

A particle made of covalently bonded atoms

Answer 8

Molecule

Question 9

Shows an element’s combining ability

Answer 9

Oxidation number

Question 10

Tells which elements are in a compound and their ratios

Answer 10

Chemical formula

Question 11

Which elements are least likely to react with other elements

Metals
Noble gases
Nonmetals
Transition elements

Answer 11

Noble gases

Question 12

What is the name of CuO

Copper oxide
Copper(I) oxide
Copper (II) oxide
Copper (III) oxide

Answer 12

Copper (II) oxide

Question 13

Which of the following formulas represents a non polar molecule

N2
H2O
NaCl
HCI

Answer 13

N2

Question 14

How many electrons are in the outer energy level of Group 17 elements

1
2
17
7

Answer 14

7

Question 15

Which is a binary ionic compound

O2
NaF
H2SO4
Cu(NO3)2

Answer 15

NaF

Question 16

Which of these is an example of an anhydrous compound

H2O
CaSO4
CuSO4 5H2O
CaSO 4 2H2O

Answer 16

CaSO4

Question 17

Which of the following is an atom that has gained an electron

Negative ion
Positive ion
Polar molecule
Nonpolar molecule

Answer 17

Negative ion

Question 18

Which of these is an example of a covalent compound

Sodium chloride
Calcium fluoride
Calcium chloride
Sulfur dioxide

Answer 18

Sulfur dioxide