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Classwork: March 10th Practice

Total questions: 40

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

What is oxidation number of each H in CaH2?

a)

+1

b)

-1

c)

0

d)

-2

2.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

a)

SO

b)

SO2

c)

SO3

d)

SO4

3.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

a)

NaPO2

b)

Na2PO3

c)

Na3PO4

d)

NaPO4

4.

Identify the species (element or ion) that is oxidized and reduced

2As + 3Cl2 → 2AsCl3

a)

As is oxidized and Cl- is reduced

b)

As3+ is oxidized and Cl is reduced

c)

As is oxidized and Cl is reduced

d)

As is reduced and Cl is oxidized

5.

What is the molarity of  420 ml of a KCl solution that contains 16.0 grams of KCl?

  1. 1. Volume must be in liters

  2. 2. grams of potassium chloride must be converted to moles of KCl

  3. 3. Use the correct equation from Table T

a)

625 M

b)

0.51 M

c)

3.19 M

d)

0.00563 M

6.

How many grams of AgNO3 (MM = 169.87) are needed to prepare 0.125M solution in 250mL of water? 

  1. 1. You need to convert mL to L

  2. 2. Then use the molarity formula to find moles of AgNO3

  3. 3. Then, use the molar mass ratio to convert moles to grams of AgNO3

a)

0.03 g

b)

0.5 g

c)

5.3 g

d)

84.9 g

7.

What is the molarity of a solution of HCl if .55 L of solution contains .86 mole of HCl?

a)

1.6 M

b)

6.4 M

c)

0.64 M

d)

.16M

8.

There is 0.003 g of solute in 800 g of water. What is the concentration in parts per million?

a)

.27 ppm

b)

37.5 ppm

c)

3.75 ppm

d)

27 ppm

9.

What is the concentration of O2(g), in parts per million, in a solution that contains 8 milligrams of O2(g)dissolved in 1000. grams of H2O(l)?

a)

0.8 ppm

b)

8 ppm

c)

80 ppm

d)

800 ppm

10.

What is the molarity of a 2.5 L solution containing 15 moles of soute?

a)

4.0M

b)

6.0M

c)

1.2M

d)

0.17M

11.

What is the concentration of solution (in ppm) made up of 0.005 grams of solute in 350 grams of solution?

a)

14.3 ppm

b)

12.1 ppm

c)

1.4 ppm

d)

9.8 ppm

12.

The concentration of a solution is 284,000 ppm. How many grams of solute is contained in 100 grams of solution

a)

28.4 grams

b)

284 grams

c)

2.84 grams

d)

2840 grams

13.

How many grams of AgNO3 (Molar Mass = 169.87g/mol) are needed to prepare 0.125M solution in 250 mL of water? 

a)
.03g
b)
0.5g
c)
5.3g
d)
84.9g
14.

Based on the activity series, will this reaction occur?

Au (s) + HCl (aq) →

a)

Yes

b)

No

15.

A mixture contains cobalt metal, copper metal, and tin metal. It is placed in an aqueous solution of nickel (III) nitrate. Which metals, if any, will react?

a)

Cobalt only

b)

Copper only

c)

Tin only

d)

All 3

16.

Predict the product(s) of this reaction (don't worry about balancing):

SrI2 +Br2→

a)

Sr + I2Br2

b)

SrBr + I2

c)

SrBr2 + I2

d)

Sr + IBr2

17.
What  will be the result of the following: 
Li + NaF ->
a)
Li will replace F
b)
Na will replace Li
c)
Li will replace Na
d)
no reaction will occur
18.
A displacement (single replacement) reaction will occur when...
a)
a more reactive metal displaces a less reactive metal from its compound.
b)
A less reactive metal displaces a more reactive metal from its compound
c)
Displacement only occurs when two of the same metals are reacted 
d)
Displacement reactions will only occur in metals above iron in the reactivity series
19.

Given the equation representing a reaction: 3CuCl2(aq) + 2Al(s) → 3Cu(s) + 2AlCl3(aq). The oxidation number of copper changes from to .

a)

A) +1 to 0

b)

B) +2 to +1

c)

C) +2 to 0

d)

D) +6 to +3

20.

Which particles are transferred during a redox reaction?

a)

atoms

b)

electrons

c)

positrons

d)

neutrons

21.

Which metal is most easily oxidized?

a)

Co

b)

Ag

c)

Cu

d)

Mg

22.

Which half-reaction equation represents reduction?

a)

Ag+ → Ag + e-

b)

Cu → Cu2+ + 2e-

c)

Cu2+ + 2e- → Cu

d)

Ag + e- → Ag+

23.
2Pb(NO3)2   -->   2PbO +  4NO2  +  O2
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
24.
2Pb(NO3)2   -->   2PbO +  4NO2  +  O2
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
25.
2 C5H5 + Fe --> Fe(C5H5)2 
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
26.

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

27.

3 Pb + 2 H3PO4 ----> 3 H2 + 1 Pb3(PO4)2

a)

Synthesis (or combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

28.

Determine the oxidation number of the selected element in each ion/ compound.

a) N in N2O4

b) Cr in CrO4 2-

c) I in IO3-

a)

+8, -6, +5

b)

+2, +8, +6

c)

+4, +6, +5

d)

-4, -6, -5

e)

-4, -8, -6

29.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

30.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

31.

In a reaction, copper is reduced; its number of electrons has:

a)

Increased

b)

Decreased

c)

Remained Constant

d)

Varies Randomly

32.

An element's oxidation numbers changed from zero to +2 during a reaction. What happened to that element?

a)

It was oxidized

b)

It was reduced

c)

It was both oxidized and reduced

d)

It was neither oxidized nor reduced

33.

What is the oxidation state of Nitrogen in N2 (g)?

a)

4

b)

6

c)

2

d)

0

34.

Identify the substance that is reduced in the reaction between copper(II) ion and magnesium.

Cu2+ + Mg → Cu + Mg2+

a)

Cu2+

b)

Mg

c)

Cu

d)

Mg2+

35.

In which substance does sulfur have a negative oxidation number?

a)

Na2S

b)

SO2

c)

S

36.

Identify the species oxidized in the following reaction.


2 Al(s) + 3 Cu2+(aq) → 2 Al3+(aq) + 3 Cu(s)

a)

Al

b)

Al3+

c)

Cu

d)

Cu2+

37.
Jessie estimates the weight of her cat to be 8 pounds.  The actual weight of the cat was 10 pounds.  Find the percent error.  
a)
15%
b)
20%
c)
25%
d)
30%
38.

The accepted density for copper is 8.96 g/ml. Calculate the percent error if a student's measurement was 8.86 g/ml.

a)

12%

b)

11%

c)

1.11%

d)

1.9%

39.
True or False? The higher the concentration of a solution the less solutes it has in it.
a)
True
b)
False
40.

What is the charge of a pure element in a half reaction?

a)

+3

b)

0

c)

+2

d)

+1

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