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ENCHEM30 Final Exam

Total questions: 80

Worksheet time: 1hrs 3mins

Name
Class
Date
1.

What is the oxidation number of chlorine in HClO?

a)

0

b)

-1

c)

+1

d)

+5

2.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

3.

The sum of the oxidation numbers in SCN- is equivalent to

a)

0

b)

-1

c)

+1

d)

+3

4.

What is the oxidation number of nitrogen in N2?

a)

-3

b)

0

c)

+4

d)

-1

5.

Rusting is a _____________ process.

a)

Mechanical

b)

Chemical

c)

Physical

6.

What two things cause Iron to Rust ?

a)

Air and Oxygen

b)

Oxygen and Water

c)

Water and Carbon dioxide

d)

Carbon dioxide and Air

7.
Alpha particles.....
a)
a) are positively charged.
b)
b) consist of two protons and four neutrons.
c)
c) can penetrate any thickness of matter
d)
d) All of the above 
8.
Radioactive materials have unstable...
a)
electrons
b)
protons
c)
nuclei
d)
neutrons
9.
Two atoms of the same element but with different mass numbers are called________
a)
electrons
b)
isotopes
c)
ions
d)
reaction partners
10.
Radioactive materials have unstable...
a)
electrons
b)
protons
c)
nuclei
d)
neutrons
11.

What do these isotopes of carbon all have in common?


126C, 136C, 146C

a)

they all have the same number of neutrons & mass number

b)

they all have the same atomic number and neutrons

c)

they all have the same atomic number and electrons

d)

they all have the same number of protons, atomic number, and mass number

12.
In order of most to least penetrating radiation we have
a)
Alpha , Beta,  Gamma
b)
Beta , Gamma , Alpha
c)
Gamma, Beta, Alpha
d)
Gamma, Alpha, Beta
13.
Everything is made up of little tiny things called _____
a)
compounds
b)
molecules
c)
atoms
d)
solids
14.
In the center of the atom is something called _____
a)
the kernel
b)
the cell
c)
the nucleus
d)
the focal point
15.
What are the names of the particles in the nucleus?
a)
protons and neutrons
b)
protons and electrons
c)
photons and neutrons
d)
nucleons and protons
16.
What is the charge of the neutron?
a)
Negative
b)
Positive
c)
electrical charge
d)
Neutral (no charge)
17.
What is the charge of the electron
a)
positive
b)
no charge
c)
negative
d)
neutral
18.

The % of the parent isotope remaining after 1 Half Life.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

19.
Uranium is found in 
a)
the sun
b)
hydrogen
c)
rocks in the ground
d)
xrays
20.

What type of radiation releases a Helium nucleus?

a)

all of these

b)

gamma ray

c)

beta particle

d)

alpha particle

21.

What type of radiation would produce the following?

a)

all of these

b)

gamma ray

c)

beta particle

d)

alpha particle

22.

What will the atomic mass be of the isotope produced when uranium-235 undergoes ALPHA decay?

a)

231

b)

235

c)

233

d)

238

23.

Iodine-131 has a half life of 8 days. Carbon-14 has a half life of 5,730 years. Uranium-238 has a half life of 4.5 billion years. Which material is best used to determine the age of our solar system?

a)

They are all good to use

b)

Iodine-131

c)

Uranium-238

d)

Carbon-14

24.

Which is the most penetrating type of radiation?

a)

all of these

b)

gamma ray

c)

beta particle

d)

alpha particle

25.

Particles are always _____________.

a)

Moving

b)

Stationary

c)

Close together

d)

Repelled from one another.

26.

What is fusion?

a)

The action of splitting an atom into smaller parts

b)

collision of two or more atoms

c)

the explosion of an atom

d)

When two or more nuclei are combined to form one or more atomic nuclei

27.

What is fission?

a)

The joining of multiple atomic nucleii

b)

Used to date organic matter up to a few tens of thousands of years; inaccurate beyond that time scale

c)

The splitting of an atomic nucleus

d)

Essentially an electron, resulting from the breakdown of a neutron in the nucleus

28.

How many neutrons in Thorium-232?

a)

142

b)

90

c)

238

d)

You cannot tell from the information?

29.

Solve the nuclear decay reaction:

a)
b)
c)
d)
30.

What in the name for the original, unstable isotope before decay

a)

Parent isotope

b)

Father isotope

c)

Daughter isotope

d)

Son Isotope

31.

Solve this equation.

85209At = ___ + 24He

a)

83205Bi

b)

86209Rn

c)

81207Tl

d)

85208At

32.

The conversion of atoms of one element to atoms of another is known as ____________ .

a)

transmutation

b)

transuranium

c)

quark

d)

fission

33.

What are the two types of transmutation?

a)

Artificial and natural

b)

Gamma and beta

c)

Gamma and alpha

d)

Alpha and beta radiation

34.

This measures the average kinetic energy of molecules

a)

temperature

b)

heat

c)

Kevin

d)

Carbon dioxice

35.

Heat loss causes matter to ________. Heat gain causes matter to ________.

a)

contract ; expand

b)

expand ; contract

c)

stay ; change

d)

change ; stay

36.

What type of system is this/

a)

open

b)

closed

c)

isolated

37.

How much energy is required to completely boil away 150g water?

a)
56,484 J
b)
339,000 J
c)
395,484 J
d)
385,484 J
38.

If a 8.50g ice cube at -10.0o C sits out on the counter, completely melts, and then warms to room temperature (25.0 o C) how much energy did the ice cube absorb?

a)

177 J

b)

1070 J

c)

888 J

d)

3905 J

39.

Calculate the standard enthalpy change for the combustion of methane.

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)CH_4\left(g\right)\ +\ 2O_2\left(g\right)\ \rightarrow\ CO_2\left(g\right)\ +\ 2H_2O\left(l\right)  

a)

-891 kJ

b)

-605 kJ

c)

605 kJ

d)

891 kJ

40.

Thermal energy is...

a)

Energy produced by a power source

b)

Energy that causes a change in temperature between materials

c)

Energy produced by a machine or moving part

d)

What is needed to do work

41.

Amino acids react to form peptides and proteins, this process is known as

a)

addition polymerization

b)

substitution polymerization

c)

condensation polymerization

d)

hydration polymerization

42.

Large molecules made up of small monomers are called

a)

polymers

b)

peptides

c)

peptones

d)

monomers

43.

Monomers of ethene in thousand numbers react together in addition polymerization to produce

a)

polyamides

b)

polyesters

c)

poly(ethene)

d)

all of them

44.

Which of these is an example of synthetic polymer?

a)

cotton fibers

b)

rubber

c)

wool

d)

polyvinyl chloride (PVC)

45.
Proteins are composed of what smaller subunits?
a)
amino acids
b)
nucleic acids
c)
fatty acids
d)
nucleotides
46.

Which polymers occur naturally?

a)

Starch and Nylon

b)

Starch and Cellulose

c)

Proteins and Nylon

d)

Proteins and PVC

47.

which of the following is not a product of condensation polymerisation

a)

kevlar

b)

nylon 6,6

c)

dacron

d)

polyvinyl chloride

48.

Give number of atom/s in BCC.

a)

0

b)

1

c)

2

d)

4

49.

Effective number of atoms in HCP.

a)

2

b)

4

c)

6

d)

8

50.
Which of the given cubic structure has the highest packing factor
a)
FCC
b)
BCC
c)
SC
d)
none
51.

The correct order of the packing efficiency in different types of unit cells is _______?

a)

fcc < bcc < simple cubic

b)

fcc > bcc > simple cubic

c)

fcc < bcc > simple cubic

d)

bcc < fcc > simple cubic

52.

Atomic packing factor is

a)

Distance between two adjacent atoms

b)

Projected area fraction of atoms on a plane

c)

Volume fraction of atoms in cell

d)

None

53.

Atomic radius of BCC sturucture is

a)

3\sqrt{3} a/4

b)

2\sqrt{2} a/4

c)

4a/ 3\sqrt{3}

d)

a/2

54.

Packing density of BCC stucture is  ----------(percentage)

a)

74

b)

32

c)

54

d)

68

55.

Identify the given crystal structure

a)

HCP

b)

SC

c)

FCC

d)

BCC

56.

Copper has FCC structure and its atomic radius is 1.273

A°A\degree  . Calculate its lattice parameter.

a)

0.360 A°A\degree  

b)

0.63 A°A\degree  

c)

3.60 A°A\degree  

d)

3.06 A°A\degree  

57.

It is an atmospheric heating phenomenon in which the Earth experiences rise in temperature because certain gases like water vapor, carbon dioxide, nitrous oxide, and methane in the atmosphere allow incoming sunlight to pass through but trap heat radiated from the earth’s surface.

a)

Carbon Cycle

b)

Carbon Fixation

c)

Greenhouse Effect

d)

Nitrogen Cycle

58.

This layer of the atmosphere is where the Aurora Borealis mosty occur.

a)

Troposphere

b)

Thermosphere

c)

Mesosphere

d)

Stratosphere

59.

The current proportion of gases is approximately

a)

20% nitrogen, 80% oxygen and small proportions of various other gases.

b)

80% nitrogen, 20% oxygen and small proportions of various other gases.

c)

70% nitrogen, 30% oxygen and small proportions of various other gases.

d)

30% nitrogen, 70% oxygen and small proportions of various other gases.

60.

Why are greenhouse gases important?

a)

They maintain temperature to support life

b)

They maintain atmospheric pressure to support life

c)

They maintain oxygen concentration to support life

d)

All of the previous answers.

61.

This is the layers of gas around earth.

a)

Atmosphere

b)

Thermosphere

c)

Methane

d)

Ozone

62.
What is humus?
a)
soil
b)
organic matter
c)
loam
d)
minerals
63.
Soil is made of _?_.
a)
weathered rocks and minerals
b)
dead plants and animals
c)
air and water
d)
all of the above
64.
The layer of soil which the topsoil is found.
a)
Horizon A
b)
Horizon B
c)
Horizon C
d)
Horizon D or R
65.

Which horizon is made up of partially weathered rocks?

a)

Horizon A

b)

Horizon B

c)

Horizon C

d)

Horizon D or R

66.

The presence or absence of mountains and valleys, is also involved in soil formation.

a)

topography

b)

time

c)

climate

d)

organism

67.
Pure water has a
a)
Neutral pH 
b)
Negative pH
c)
Positive pH
d)
Both Negative and Positive pH
68.
A solvent is...
a)
substance into which the solute dissolves
b)
a compound being dissolved
c)
a substance that does not dissolve
d)
None of the above
69.
What is water made of?
a)
Water
b)
Liquid
c)
Hydrogen and oxygen
d)
Blue 
70.
Which of the following is LEAST likely to dissolve in water?
a)
nonpolar fats and oils
b)
polar sugar molecules
c)
salt made of a positive sodium ion and a negative chloride ion
d)
all of the substances will dissolve easily in water
71.
Water is a universal solvent because it...
a)
It can be found anywhere
b)
It freezes when it gets cold
c)
floats when frozen
d)
Dissolves most substances
72.
Acids have more what? 
a)
OH ions 
b)
OH- ions
c)
H+ ions 
d)
All of the above 
73.
Phosphates are important to life but can also cause what deadly phenomenon to occur? 
a)
More oxygen availability 
b)
More sunlight availability 
c)
Fish thriving 
d)
Eutrophication 
74.

What pH would be considered neutral?

a)

2

b)

10

c)

7

75.

Which pH would be considered basic?

a)

6

b)

10

c)

4

76.

Which of the following would be NONPOLAR?

a)

bleach

b)

vinegar

c)

oil

d)

water

77.

What part of this diagram is Oxygen?

a)

A

b)

B

c)

C

78.

Water sticking to other substances.

a)

cohesion

b)

pH

c)

adhesion

d)

reactant

79.

A solution of 6.7 would be classified as what?

a)

weak acid

b)

weak base

c)

strong acid

d)

strong base

80.

What property allows water to move from the roots of plants to the top of the plant?

a)

molecules

b)

high heat capacity

c)

surface tension

d)

capillary action

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