Free Printable ENV112 (pt4)

1.

What is the gram formula mass of $(NH_4)3PO_4$ ?

a)

113 g

b)

121 g

c)

149 g

d)

151 g

2.

What amount of oxygen is needed to completely react with 1 mole of $CH_4$ ? Given: $CH_4+2O_2→CO_2+2H_2O$

a)

2 moles

b)

2 atoms

c)

2 grams

d)

2 molecules

3.

In a reaction, the limiting reactant is the one that ___

a)

has the smaller initial mass

b)

gives the lower yield of product

c)

is left over at the end of the reaction

d)

has the largest number of atoms in its formula

4.

Which one of the following equations is NOT chemically balanced?

a)

$2Cr+Fe_2O_3->2Fe+Cr_2O$

b)

$2KClO_3->2KCl+3O_2$

c)

$Na_2CO_3+HCl->2NaCl+H_2O+CO_2$

d)

$2SO_2+O_2->2SO_3$

5.

What is the percent yield of water if 0.90 g of water is obtained when 29.0 g of butane is burned in excess oxygen? Balanced equation: $2C_4H_{10}+13O_2->8CO_2+10H_2O$

a)

0.02%

b)

2.00%

c)

1.0%

d)

0.36%

6.

Which of the following is the correct electron-dot formula for water?

a)

H-O:

b)

H-O

c)

{:H

d)

8:H-6:O

7.

The bonding in $H_2O$ is best characterized as

a)

polar covalent

b)

non-polar covalent

c)

ionic

d)

coordinate covalent

8.

Which pair of elements would most likely form a covalent compound?

a)

Na and Cl

b)

H and Cl

c)

Al and O

d)

Mg and O

9.

Balance the following equation using electron transfer method: $....HNO_3+...P+....H_2O->....H_3PO_4+...NO$ . What is the sum of coefficients?

a)

8

b)

10

c)

12

d)

18

10.

What is the oxidizing agent in this equation?

a)

H+

b)

$H_2O$

c)

OH-

d)

$HNO_3$

11.

Which substances are oxidized during $Fe+H_2SO_4->FeSO_4+H_2$ ?

a)

Fe

b)

$H_2SO_4$

c)

$FeSO_4$

d)

$H_2$

12.

The oxidation number of Mn in $MnO^4-$ is

a)

-7

b)

7

c)

8

d)

-8

13.

If a compound has a pH of 6.5, it has a pOH of ___

a)

6.5

b)

7.5

c)

3.16x10^-7

d)

3.16x10^-8

14.

The definition of a base according to Bronsted and Lowry

a)

A base is a hydrogen ion acceptor in aqueous solution

b)

A base is an electron pair donor in aqueous solution

c)

A base increases the concentration of hydroxide ion

d)

A base is a hydroxide ion donor in aqueous solution

15.

The pH of a solution is equal to

a)

the hydrogen ion concentration [H+]

b)

log[H+]

c)

-log[H+]

d)

ln[H+]

16.

What is the difference between the endpoint and equivalence point in a titration?

a)

The endpoint is when pH=7

b)

Equivalence point is when pH=7

c)

Endpoint and equivalence point are the same

d)

None of these answers is correct

17.

___ is a weak acid

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Nitric acid

d)

Acetic acid

18.

Oxidation may be defined as a reaction in which

a)

an element gains electrons

b)

an element donates protons

c)

the oxidation number of an element increases

d)

an element forms an anion

19.

Which one of the following reactions is NOT a redox reaction?

a)

$HCl+NaOH->NaCl+H_2O$

b)

$CuO+H_2->Cu+H_2O$

c)

$Zn+H_2SO_4->ZnSO_4+H_2$

d)

$CH_4+2O_2->CO_2+2H_2O$

20.

If it takes 5.0 mL of 1.4 M NaOH to neutralize 150 mL of HCl with unknown concentration, what was the original concentration of the acid?

a)

0.47 M

b)

0.047 M

c)

0.14 M

d)

0.014 M

21.

Which of the following changes is a reduction reaction?

a)

$Fe^{2+}->Fe^{2+}$

b)

$O^2->O$

c)

$Cu^{2+}->Cu$

d)

Cr -> Cr

22.

Which of the following acids has the smallest pH value?

a)

0.01 M HCl

b)

0.01 M $CH_3COOH$

c)

0.01 M $HNO_3$

d)

0.01 M $H_2SO_4$

23.

Phenolphthalein (pH range 8.0-10.0) may be used as an indicator for the titration between

a)

$H_2SO_4and\ NaOH$

b)

$HCl\ and\ NH_4OH$

c)

$CH_3COOH\ and\ KOH$

d)

$CH_3COOH\ and\ NaOH$

24.

The buffer solution essentially consists of

a)

a weak acid and its conjugate base

b)

a strong acid and a weak base

c)

an oxidizing agent and a reducing agent

d)

an acidic salt

ENV112 (pt4)

Total questions: 24

Worksheet time: 12mins

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