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Semester 1 Exam Dec 2019 Morales

Total questions: 50

Worksheet time: 1hrs 17mins

Name
Class
Date
1.

What is the conclusion of Rutherford's "Gold Foil" Experiment?

a)

Atoms are mostly empty.

b)

Neutrons are neutral particles in the nucleus.

c)

Electrons are located in energy levels around the nucleus.

d)

Electrons are in cloud of probability.

2.
How many SigFigs are in 0.0345 sec?
a)
3
b)
2
c)
4
d)
5
3.

How many SigFigs are in 2.4500 L?

a)

3

b)

4

c)

5

d)

6

4.

How should you write 1,333,000 in scientific notation?

a)

1.333 x 106

b)

1.333 x 104

c)

1.333 x 103

d)

1.333 x 107

5.

How should you write 1.01 x 10-9 in standard notation?

a)

0.00000000101

b)

0.09

c)

101109

d)

101,000,000

6.
You should wear goggles in chemistry class, whenever we are working with:
a)
all of these
b)
heat
c)
chemicals
d)
glassware
7.
When diluting acids, always add:
a)
acid to water
b)
water to acid
c)
oil
d)
vinegar
8.
How many milliliters are in 1.5 L?
a)
1500
b)
150
c)
150000
d)
15
9.

How many moles of water are in 7.88 x 1025 molecules of water, to the nearest whole number?

a)

131

b)

130

c)

1

d)

10

10.

If my dog lived to be exactly 12 years old, how many seconds would that be? (Must use the following conversion factor to get the right answer: 1 year = 365 days)

a)

3.8 x 108

b)

3.8 x 106

c)

1.1 x 105

d)

6.3 x106

11.

If a faucet was leaking at a rate of 0.5 mL per minute, how many liters would that be after 1 month (must use the following conversion factor to get the right answer: 1 month = 30 days)?

a)

21.6

b)

21600

c)

720

d)

900

12.

If you weighed a sample of graphite with an expensive scale that measures to 0.001 g, but forgot to "zero out" the mass of the weighing dish, the resulting reading on the scale's screen would be:

a)

precise but inaccurate

b)

accurate but imprecise

c)

neither accruate nor precise

d)

accurate and precise

13.

Sonia calculated that the volume of a block of wood was 30.5 mL, but the actual value was 31.0 mL. What was Sonia's percent error?

a)

1.61%

b)

1.64%

c)

1.46%

d)

0.5%

14.

What do you call a substance that has its own space on the periodic table?

a)

element

b)

polyatomic

c)

compound

d)

nucleus

15.
How do chemists classify a pure substance made of more than one element?
a)
compound
b)
mixture
c)
heterogeneous
d)
colloid
16.

How are combinations which are made of both elements AND compounds classified?

a)

mixture

b)

colloid

c)

polyatomic

d)

compound

17.
Which case describes a homogeneous sample?
a)
an even mixture with one phase
b)
a clumpy mixture with two or more phases
c)
a compound
d)
a colloid
18.

Which case describes a heterogeneous sample?

a)

an even mixture with one phase

b)

a clumpy mixture with two or more phases

c)

a compound

d)

a colloid

19.
An atom with 3 protons must be:
a)
lithium
b)
boron
c)
scandium
d)
sodium
20.
An atom with 3 protons and 5 neutrons must be
a)
an isotope of lithium
b)
an isotope of boron
c)
nitrogen
d)
boron
21.
If these are the abundances of element X: 70% X-45, 30% X-43, then what is the average atomic mass of element X?
a)
44.4 amu
b)
44.9 amu
c)
44.0 amu
d)
45.0 amu
22.
What shall we call a highly reactive metal from group 1?
a)
alkali metal
b)
alkaline earth metal
c)
transition metal
d)
metalloid
23.
What shall we call a highly reactive non-metal from group 17?
a)
halogen
b)
noble gas
c)
metalloid
d)
carbides
24.
What shall we call metals of variable charge from groups 3-12?
a)
transition metals
b)
alkali metals
c)
alkaline earth metals
d)
metalloids
25.

What shall we call a verticle column of elements on the periodic table?

a)

group

b)

period

c)

configuration

d)

trend

26.

What shall we call a horizontal row of elements on the periodic table?

a)

period

b)

group

c)

trend

d)

radius

27.

As we move diagonally across the periodic table, up towards fluorine, atoms grow in:

a)

electronegativity

b)

radius

c)

rings

d)

energy levels

28.

What is the electron configuration of neon?

a)

1s22s22p6

b)

2p6

c)

[Ne]

d)

2s22p6

29.

A compound that is made of a metal AND a non-metal is most likely:

a)

an ionic compound

b)

a covalent compound

c)

a metalloid

d)

a mixture

30.

What is the official, IUPAC name of CaCl2?

a)

calcium chloride

b)

calcium (II) chloride

c)

calcium chlorine

d)

calcium chlorate

31.

What is the official, IUPAC name of (NH4)2O?

a)

ammonium oxide

b)

ammonium (II) oxide

c)

nitrogen hydroxide

d)

nitrogen hydrogen oxide

32.

What is the official, IUPAC name of CuSO4?

a)

copper (II) sulfate

b)

copper sulfate

c)

copper (IV) sulfate

d)

copper sulfide

33.

What is the formula for strontium oxide?

a)

SrO

b)

Sr2O

c)

Sr2O2

d)

SrO2

34.

What is the formula for aluminum sulfide?

a)

Al2S3

b)

AlS

c)

Al2S

d)

AlS3

35.

Which is the correct formula for dinitrogen tetrafluoride?

a)

N2F4

b)

NF4

c)

N2F

d)

N2F2

36.

What is the correct name for CF6?

a)

carbon hexafluoride

b)

monocarbon hexafluoride

c)

carbon fluoride

d)

carbon fluorine

37.

Pick the correctly drawn Lewis dot diagram for a chlorine atom.

a)
b)
c)
d)
38.

Which is the correct Lewis structure for sodium chloride?

a)
b)
c)
d)
39.

What can you tell about "X"?

a)

It weighs 55 amu.

b)

It has 33 neutrons.

c)

It is element #55.

d)

It has 33 electrons.

40.
The correct Bohr model for germanium should have this many dots:
a)
32
b)
14
c)
4
d)
2
41.
The correct Bohr model for phosphorous should have this many rings:
a)
3
b)
5
c)
15
d)
30
42.
Predict the molecular geometry of hydrogen fluoride.
a)
linear
b)
trigonal-planar
c)
tetrahedral
d)
pyramidal
43.

The bond angle for a trigonal-planar molecule, such as boron trifluoride (BF3), would be _____ degrees.

a)

120

b)

109.5

c)

104

d)

90

44.

Predict the molecular geometry of SO3.

a)

trigonal-planar

b)

tetrahedral

c)

trigonal pyramidal

d)

octahedral

45.

Predict the molecular geometry of methane (CH4).

a)

tetrahedral

b)

linear

c)

pyramidal

d)

bipyramidal

46.
Which of the following has the smallest bond angle?
a)
water
b)
ammonia
c)
methane
d)
carbon dioxide
47.

Pick the correctly balanced equation for the combustion of butane (C4H10), in the true style of chemistry

a)

2C4H10 + 13O2 --> 8CO2 + 10H2O

b)

1C4H10 + 6.5O2 --> 4CO2 + 5H2O

c)

1C4H10 + 11O2 --> 8CO2 + 10H2O

d)

4C4H10 + 26O2 --> 16CO2 + 20H2O

48.

What is the sum of the coefficients after you balance: ___CH4 + ____O2 --> ____CO2 + ____H2O

a)

6

b)

5

c)

7

d)

8

49.
In a balanced equation, the "-->" is properly called the:
a)
yield
b)
arrow
c)
makes
d)
equals
50.

Pick the correct skeletal equation for the synthesis of water:

a)

H2 + O2 --> H2O

b)

H2O --> H2 + O2

c)

H2 + O2 --> H2O2

d)

H2 --> H2O + O2

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