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Chemistry B Exam

Total questions: 37

Worksheet time: 2hrs 40mins

Name
Class
Date
1.
What is the molar mass of B2(CO3)3?
a)
81.632 g/mol
b)
94.842 g/mol
c)
38.822 g/mol
d)
201.648 g/mol
2.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
3.
What is emitted during Alpha Radiation?
a)
A helium nuclei.
b)

A full helium atom

c)
Gamma Rays.
d)
Positrons
4.

What is the percent error of the following experiment?

Theoretical Yield: 3.3 grams

Actual Yield: 2.5 grams

a)

24%

b)

76%

c)

12%

d)

56%

5.

What is the percent yield of the following experiment?

Theoretical Yield: 3.3 grams

Actual Yield: 2.5 grams

a)

24%

b)

76%

c)

12%

d)

56%

6.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
7.

This reaction is at equilibrium. Which of the following would cause more Hydrogen to be produced?

Co(H2O)6 + HCl + Heat <-------> CoCl4 + H2O + H2

a)

Remove H2 as it is produced.

b)

Increasing the heat.

c)

Adding more HCl.

d)

Increasing the concentration of the reactants.

e)

All of these will make more Hydrogen be produced.

8.

What are the correct formulas and coefficients for the products of the following single-replacement reaction?

Mg + Al(OH)3 →

a)

No Reaction

b)

Al + Mg(OH)3

c)

Al + Mg(OH)2

d)

MgAl + (OH)3

9.

What is the percent Oxygen in Ca(OH)2?

a)

43.18%

b)

56.82%

c)

100%

d)

32g

10.

What type of equation is this?


Ca(OH)2 + HNO3 → Ca(NO3)2 + H2O

a)

Addition

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

11.

What type of equation is this?


C2H6 + O2 → CO2 + H2O

a)

Addition

b)

Combustion

c)

Single Displacement

d)

Double Displacement

12.

What type of equation is this?


2Na + Br2 → 2NaBr

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

13.

What type of equation is this?


H2O + Fe → Fe2O3 + H2

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

14.

What type of equation is this?


KClO3 → KCl + O2

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

15.

What do the lower letters of (s), (aq), and (g) stand for in equations?

a)

sand, aquarium, grape

b)

solid, aqueous, gas

c)

sausage, acquaintance, giraffe

16.
Which of the following is NOT true at equilibrium?
a)
The forward and reverse reactions proceed at the same rate.
b)
The concentrations of reactants and products do not change.
c)

The concentration of the reactants is equal to the concentration of the products (Same amount of products and reactants).

d)
The forward and reverse reactions continue to occur.
17.
What type of reaction is shown in the reaction pathway?
a)
endothermic reaction
b)
exothermic reaction
18.

ΔΗ =

a)

40

b)

100

c)

-20

d)

+20

19.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
20.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
21.

The half life of a substance is 10 years. 25% of the substance remains. How old is the substance?

a)

10 years

b)

20 years

c)

100 years

d)

Not possible to calculate

22.
The idea that when a system at equilibrium is stressed, it will react to relieve that stress and return to equilibrium is known as:
a)
Boyle's Law
b)
Le Chatelier's Principle
c)
Charles Law
d)
Denninger's Law
23.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
24.
What is the limiting reactant if 10 moles of NH3  react  with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
25.
Which type of nuclear radiation is being emitted here?
a)
Alpha
b)
beta
c)
gamma 
d)
none
26.

Which reaction represents fusion?

a)
b)
c)
d)
27.

What is the molar mass of (NH4)2CO3 ?

a)

144.0g

b)

138.0 g

c)

96.1 g

d)

78.1 g

28.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
29.
Which has more molecules?
a)
1 mole H2O
b)
1 mole Al(OH)3
c)
1 mole NaCl
d)
There are all the same
30.

Avogadro's number of representative particles is equal to _____.

a)

One mole of any substance

b)

6.022 x 1023 particles

c)

A very large number of particles

d)

All of these

31.
What is the mass in grams of 5.90 mol C8H18?
a)
.0512 g
b)
19.4 g
c)
673 g
d)
389 g
32.
How many moles are in 19.82 g Mg? 
a)
1.226mol Mg
b)
481.7mol Mg
c)
1.000mol Mg
d)
 0.8156 mol Mg
33.
The collision theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions
a)
True
b)
False
34.
What is the missing isotope that will balance the following nuclear equation?
94Be  +  11H →  _____  +  42He
a)
105B
b)
105Ne
c)
63Li
d)
63C
35.

What type of radiation can only be stopped by a thick lead sheet?

a)

Alpha radiation

b)

Beta radiation

c)

gamma radiation

36.

Which of these symbols represent gamma decay?

a)
b)
c)
d)
37.

Predict the products for the this Double Replacement reaction:

AgNO3 + KCl →

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

KAg + NO3Cl

d)

AgCl + 3 KNO

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