CHM 121 Test 2

Question 1

In any balanced chemical equation, the elements from reactants to products side of the reaction will be ____.

Answer 1

equivalent

Question 2

A chemical equation is balanced when _____.

Answer 2

the number element count is the same in reactants and products

Question 3

Which of the following correctly gives the correct coefficients for the reaction below?
_Fe2 S3 + _HCl -> _FeCl3 + _H2 S

Answer 3

1,6,2,3

Question 4

What coefficient is placed in front of CO2 to balance the following equation?
_C5H8 + O2 -> _CO2 + _H2O

Answer 4

5

Question 5

What coefficient is placed in front of H2O to balance the following equation?
_C5H8 + O2 -> _CO2 + _H2O

Answer 5

4

Question 5

What coefficient is placed in front of H2O to balance the following equation?
_H2 + _O2 -> _H2O

Answer 5

2

Question 6

What coefficient is placed in front of H2 to balance the following equation?
_H2 + _O2 -> _H2O

Answer 6

2

Question 7

What coefficient is placed in front of H2O to balance the following equation?
_C2H6 + _O2 -> _CO2 + _H2O

Answer 7

6

Question 8

What coefficient is placed in front of O2 to balance the following equation?
_C2H6 + _O2 -> _CO2 + _H2O

Answer 8

7

Question 9

What coefficient is placed in front of H2O to balance the following equation?
_H3PO4 + _Ca(OH)2 -> _CaHPO4 + _H2O

Answer 9

2

Question 10

In the following reaction, what is the correct coefficient for chlorine?
_Al + _Cl2 -> _AlCl3

Answer 10

3

Question 11

As the temperature of a gas increases the _______ also increases.

Answer 11

pressure

Question 12

Which measurement correctly describes the temperature of a gas?

Answer 12

315 K

Question 13

What is the correct unit of pressure used in gas law calculations?

Answer 13

Atmosphere

Question 14

The name of Ca(OH)2 is ________.

Answer 14

calcium hydroxide

Question 15

The correct formula for the compound formed from Al and Cl is _______.

Answer 15

AlCl3

Question 16

The correct formula for Iron (III) oxide would be ________.

Answer 16

Fe2O3

Question 17

The main type of intermolecular forces between molecules of water (H2O) are _________.

Answer 17

hydrogen bonds

Question 18

The bond in HBr is a(n) ___________.

Answer 18

polar covalent bond

Question 19

The main type of intermolecular forces between molecules of hydroiodic acid (HI) are _________.

Answer 19

dispersion forces

Question 20

The main type of intermolecular forces between molecules of methane (CH4) are __________.

Answer 20

dispersion forces

Question 21

The bond in Br2 is a(n) ________.

Answer 21

nonpolar covalent bond

Question 22

The number of dots in the electron dot symbol of aluminum is ________.

Answer 22

three

Question 23

The number of dots in the electron dot symbol of magnesium is _________.

Answer 23

two

Question 24

The main type of intermolecular forces between molecules of bromine (Br2) are _________.

Answer 24

dispersion factors

Question 25

The main type of intermolecular forces between molecules of hydrochloric acid (HCl) are _______.

Answer 25

diapole-diapole attractions

Question 26

The bond in hydrochloric acid (HCl) is a(n) _________.

Answer 26

polar covalent

Question 27

When a cation is formed from a representative element ________.

Answer 27

electrons are lost and the ion is smaller

Question 28

The ion of aluminum is __________.

Answer 28

Al3+

Question 29

How many electrons will chlorine gain or lose when it forms an ion?

Answer 29

gain 1

Question 30

An ionic compound _________.

Answer 30

has a net charge of zero

Question 31

What is the correct formula for a compound formed from the elements Al and O is __________.

Answer 31

Al2O3

Question 32

What is the correct formula for the oxide ion?

Answer 32

O2-

Question 33

The correct formula for the compound formed from Mg and S is _________.

Answer 33

MgS

Question 34

Which one of the following compounds contains an ion with a 3+ charge?

Answer 34

FeCl3

Question 35

The compound MgCl2 is named _________.

Answer 35

magnesium chloride

Question 36

The correct name for the compound NCl3 is ___________.

Answer 36

nitrogen trichloride

Question 37

The molecule CO2 has ________ valance electrons.

Answer 37

16

Question 38

The name of the Cu+ ion is ________.

Answer 38

copper (I)

Question 39

What is the correct formula for the iron (II) ion?

Answer 39

Fe2+

Question 40

What is the correct formula for iron (III) ion?

Answer 40

Fe2S3

Question 41

Which of the following polyatomic ions has a 3- ionic charge?

Answer 41

phosphate

Question 42

The correct name for the compound N2O3 _______.

Answer 42

dinitrogen trioxide

Question 43

The molecule SO3 has ________ valence electrons.

Answer 43

24

Question 44

Which of the following substances contains a nonpolar covalent bond?

Answer 44

N2

Question 45

Which of the following compounds contains an ionic bond?

Answer 45

CaO

Question 46

The shape of the methane molecule (CH4) is _________.

Answer 46

tetrahedral

Question 47

The shape of the carbon dioxide molecule (CO2) is ________.

Answer 47

linear

Question 48

The shape of the ammonia molecule (NH3) is ________.

Answer 48

trigonal pyramidal

Question 49

The shape of a molecule with a central atom that has two bonded atoms and two lone pairs is ____________.

Answer 49

bent (109)