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ECHEM30 Midterm Exam

Total questions: 70

Worksheet time: 58mins

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.

Rusting is a special term, given to the corrosion metal is... .

a)

Au

b)

Pt

c)

Fe

d)

Ag

7.

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

8.
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 
9.
Radioactive materials have unstable...
a)
electrons
b)
protons
c)
nuclei
d)
neutrons
10.
Two atoms of the same element but with different mass numbers are called________
a)
electrons
b)
isotopes
c)
ions
d)
reaction partners
11.
Radioactive materials have unstable...
a)
electrons
b)
protons
c)
nuclei
d)
neutrons
12.
Two atoms of the same element but with different mass numbers are called________
a)
electrons
b)
isotopes
c)
ions
d)
reaction partners
13.

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

14.
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
15.
From the diagram, which particles are indicated with the arrow?
a)
electrons and protons
b)
protons and neutrons
c)
electrons and neutrons
d)
photons and nucleons
16.
Everything is made up of little tiny things called _____
a)
compounds
b)
molecules
c)
atoms
d)
solids
17.
These particles orbit around the nucleus of an atom.  What are they called?
a)
electrons
b)
protons
c)
neutrons
d)
photons
18.
In the center of the atom is something called _____
a)
the kernel
b)
the cell
c)
the nucleus
d)
the focal point
19.
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
20.
Which subatomic particle causes the nucleus to have a positive charge?
a)
Neutron
b)
Electrons
c)
Protons
d)
Valence electrons
21.
What is the charge of the neutron?
a)
Negative
b)
Positive
c)
electrical charge
d)
Neutral (no charge)
22.
What is the charge of the electron
a)
positive
b)
no charge
c)
negative
d)
neutral
23.
Has the symbol
a)
Alpha
b)
Beta 
c)
Gamma
24.
Has the symbol
a)
Alpha
b)
Beta
c)
Gamma
25.
Has the symbol
a)
Alpha
b)
Beta
c)
Gamma
26.

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

a)

50%

b)

25%

c)

12.5%

d)

6.25%

27.

The % of the parent isotope remaining after 2 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

28.

The amount of time it take for 1/2 of any sample to decay is know as its what?

a)

half life

b)

chain reaction

c)

half reaction

d)

U-235

29.
Splitting a uranium atom is called - 
a)
fission
b)
fusion
30.
Uranium is found in 
a)
the sun
b)
hydrogen
c)
rocks in the ground
d)
xrays
31.

What type of radiation releases a Helium nucleus?

a)

all of these

b)

gamma ray

c)

beta particle

d)

alpha particle

32.

What type of radiation releases an electron?

a)

all of these

b)

gamma ray

c)

beta particle

d)

alpha particle

33.

This is an example of (a)   decay.

34.

What type of radiation would produce the following?

a)

all of these

b)

gamma ray

c)

beta particle

d)

alpha particle

35.

What will the atomic mass be of the isotope produced when Uranium-235 undergoes BETA decay?

a)

231

b)

235

c)

233

d)

238

36.

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

a)

231

b)

235

c)

233

d)

238

37.

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

38.

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 a recently dead animal?

a)

They are all good to use

b)

Iodine-131

c)

Uranium-238

d)

Carbon-14

39.

What are the three types of radioactive decay?

a)

X-ray, gamma-ray, radio

b)

Sigma, Alpha, Delta

c)

Cosmic, granite, radon

d)

Alpha, beta, gamma

40.

Which is the most penetrating type of radiation?

a)

all of these

b)

gamma ray

c)

beta particle

d)

alpha particle

41.

Particles are always _____________.

a)

Moving

b)

Stationary

c)

Close together

d)

Repelled from one another.

42.

What makes one isotope different from another?

a)

number of neutrons

b)

number of protons

c)

number of electrons

d)

number of charges

43.

C-14 and C-12 are examples of

a)

Positrons

b)

Protons

c)

Isotopes

d)

Ions

44.

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

45.

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

46.

How many neutrons in Thorium-232?

a)

142

b)

90

c)

238

d)

You cannot tell from the information?

47.

Which choice is the correct alpha decay of uranium-238?

a)
b)
c)
d)
48.

Solve the nuclear decay reaction:

a)
b)
c)
d)
49.

Solve the nuclear decay reaction:

a)

32/15 P

b)

32/17 P

c)

32/16 P

d)

32/17 Cl

50.

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

a)

Parent isotope

b)

Father isotope

c)

Daughter isotope

d)

Son Isotope

51.

finish the equation


18173Ta --> ____ + 18174W

a)

42He

b)

0-1e

c)

y

52.

Solve this equation.

85209At = ___ + 24He

a)

83205Bi

b)

86209Rn

c)

81207Tl

d)

85208At

53.

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

a)

transmutation

b)

transuranium

c)

quark

d)

fission

54.

How do scientists perform transmutations?

a)

by bombarding atomic protons with high energy particles.

b)

by bombarding atomic nuclei with high energy particles.

c)

by splitting atoms and adding protons.

d)

by splitting electrons to release their energy.

55.

What are the two types of transmutation?

a)

Artificial and natural

b)

Gamma and beta

c)

Gamma and alpha

d)

Alpha and beta radiation

56.
What particle completes this reaction?
a)
alpha particle
b)
beta particle
c)
gamma particle
d)
neutron
57.
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
58.
Has the symbol
a)
Alpha
b)
Beta 
c)
Gamma
59.

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

a)

50%

b)

25%

c)

12.5%

d)

6.25%

60.
Splitting a uranium atom is called - 
a)
fission
b)
fusion
61.

This measures the average kinetic energy of molecules

a)

temperature

b)

heat

c)

Kevin

d)

Carbon dioxice

62.
When you touch something that feels cold, 
a)
heat from your hand moves into the cold substance.
b)
coldness moves from the cold substance into your hand.
c)
it melts.
d)
it freezes.
63.
What is the transfer of heat by movement of liquids or gases?
a)
Radiation
b)
Convection
c)
Conduction
d)
Heat
64.

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

a)

contract ; expand

b)

expand ; contract

c)

stay ; change

d)

change ; stay

65.

What type of system is this/

a)

open

b)

closed

c)

isolated

66.

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
67.

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

68.

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

69.

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

70.

Mechanical energy is...

a)

Energy produced by a machine or moving part

b)

Energy produced from vibration that you can hear

c)

Energy that can be seen by the eye

d)

Energy that causes a change in temperature between materials

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