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Mid Term Exam Review - Chemistry Theory Flashcards | StudBud
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Mid Term Exam Review - Chemistry Theory
Mid Term Exam Review - Chemistry Theory
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cumulative review of chemistry course #chemistry
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Answers
1
What did the gold foil experiment show about atomic structure
The atom is mostly comprised of alpha particles
The atom is mostly empty space
The atom is mostly comprised of neutrons
The atom is mostly comprised of electrons
2
Which set of atoms have the same number of energy levels (shells)?
Li, Al, Ge
B, Al, Ga
F, Cl, Br
C, N, O
3
What are the evidences of a chemical change?
Color change, gas, light, temperature change, precipitate
Melting, rotting, cooking
Concession, garbage, liability, biodiversity
4
Matter cannot be created or ?
blended
destroyed
taken away
added
5
Complete the nuclear equaion
53132Xe
13154Xe
13252Xe
13152Xe
6
What do nuclear power plants do with the energy created during fission?
Freeze water
Turn wind generators
Boil water
Burn wood
7
Quantitative observations are
sometimes words and numbers
words and numbers
numbers only
words only
8
Nuclear fission splits _______ nuclei making them ______ stable.
small, more
large, more
large, less
small, less
9
_______ can be separated by physical means.
A compound
A mixture
Pure substances
An element
10
Chemical changes happen
All of the above
because atoms rearrange and new bonds are formed
because a chemical reaction occurs
because bonds are broken and atoms rearrange
11
What type of mixture is this?
tom
Tasty mixture
Homogeneous
Heterogeneous
12
... is a pure substance composed of two or more different elements joined by chemical bonds.
mixture
compound
pure substance
colloid
13
what is a mixture?
matter that is made of one type of atom or molucule
a mix of atoms or molucules
14
How can you tell physical and chemical properties apart ?
Only the color of the matter will change.
The chemical nature of matter will be altered/stay the same.
Just the overall appearance of the properties will change
Nothing can tell the properties apart.
15
WHAT METHOD OF SEPARATION WOULD YOU USE TO SEPARATE A MIXTURE OF ETHANOL AND WATER?
magnetisim
Centrifugation
Separating funnel
Distillation
16
if a mixture is homogeneous, the physical properties and the composition..
are different throughout
are the same throughout
are cool
all of the above
17
What determines the order of elements on todays periodic table?
Increasing atomic number
Decreasing atomic mass
Decreasing atomic number
Increasing atomic mass
18
Which type of nuclear reaction is this?
fission
fusion
alpha decay
beta decay
19
Protons have a ________ charge.
positive
evil
neutral
negative
20
Homogeneous mixtures are also called
molecules.
atoms.
solutions.
compounds.
21
Who's theory of atomic structure is sometimes called the "planetary" model?
J. J. Thompson
John Dalton
Niels Bohr
Ernest Rutherford
22
What name is given to the particle emitted in the following nuclear decay?
Anti-electron
All of these
Beta plus
Positron
23
Complete the nuclear equation:
106B
104B
115B
105B
24
Which of the following is a mixture?
Zinc
lithium
orange juice
Oxygen
25
A sample of matter that has definite chemical and physical properties is...
A compound
A mixture
An element
A pure substance
26
What is a radioactive half life?
How long it takes for half a sample to decay.
None of the above.
Half of an unstable isotope.
How long it takes for an unstable electron to become stable.
27
Which type of nuclear reaction is this?
fission
alpha decay
beta decay
fusion
28
How many elements are there?
92
100
118
21
29
Is cutting a beet a chemical or physical change?
Physical
Chemical
30
What is the definition matter
Air and space
electricity
pickles
anything that takes up space and has mass
31
Average atomic mass is :
a weighted average of the masses of an element's isotopes
a ratio based on the mass of a Carbon-12 atom
the same for every atom
twice the number of protons in one atom
32
What state of matter has a set shape?
Solid
Liquid
Gas
33
How can you identify a compound by its physical properties?
color
all the above
melting point
density
34
What state of matter does NOT flow?
Liquid
Solid
Gas
plasma
35
What are the 6 branches of chemistry?
tech, bio, analytical, organic, enviro, physical
organic, physical, chemcial, proton, ion, biochemistry
inorganic, physical, analytical, bio, anti, theoretical
organic, physical, enviro, analytical, bio, inorganic
36
The first step of the scientific method involves
predicting the result of an experiment
making observations
performing an experiment
forming a hypothesis
37
Spontaneous nuclear decay.
Alpha decay
Nuclear breakdown
Radioactivity
Beta decay
38
What state of matter is this?
This is plasma
This is gas
This is liquid
This is solid
39
Which set of atoms have similar properties?
C, Si, Ge
Li, Be, B
B, C, N
Fe, Co, Ni
40
Which of the following lists the forms of nuclear radiation in order of increasing danger.
gamma, alpha, beta
gamma, beta, alpha
alpha, beta, gamma
beta, alpha, gamma
41
The atomic nucleus consists of what particles?
electron and neutron
proton, neutron, and electron
proton and electron
proton and neutron
42
Where does nuclear chemistry take place? (hint: Think of the root of the word!)
In the nucleus
In the orbitals
43
Qualitative Data is:
ahahshshhd sir yes sir
non-numerical data
data with amounts
numerical data
44
you are matter
False
True
45
An atom of carbon with more neutrons is called a(n) ________ of carbon.
anion
ion
cation
isotope
46
What is this method of separation?
Crystallisation
Filtration
Distillation
Evaporation
47
what are the states of matter
solid, liquid, gas, plasma
rock, paper, scissors, lizard Spock
rock, paper, scissors
48
What elements make up CO
2
?
carbon and oxygen
chlorine and oxygen
carbon and hydrogen
oxygen and cobalt
49
How many neutrons does the following isotope contain? Nitrogen-17
7
3
17
10
50
Is gathering data a part of the scientific method?
Maybe
No
Idk
Yes
51
Iodine-131 has a half life of 8 days. In 32 days, how many half lifes will there be?
4
2
8
0
52
Is rust an example of a physical change or chemical change
Chemical
Physical
53
Average atomic masses are not generally whole numbers, why?
I don't know
significant figures
weighted average
to make things more difficult
54
What state of matter is this?
This is solid
This is gas
This is liquid.
This is plasma
55
There are _________________________ elements that exist naturally.
24
102
116
92
56
What is the atomic symbol of copper?
Co
Cu
Cp
C
57
Are fireworks exploding an example of a chemical or physical change?
Chemical
Physical
58
An atom that loses electrons gains a ______ charge.
silly
neutral
positive
negative
59
The atomic number here is
16
no shown
8
2-
60
Who's theory of atomic structure is sometimes called the "nuclear" model?
Niels Bohr
John Dalton
Ernest Rutherford
J. J. Thompson
61
What is that white 'cloud' that comes out of a nuclear power plant?
clouds are made this way
pollution
steam
radioactive waste
62
what type of nuclear decay emits a positive electron from the nucleus of an atom?
beta decay
alpha decay
gamma decay
none
63
True or False: Atoms gain protons to become positively charged ions.
false
true
64
How many valence electrons does the following ion of phosphorous contain? P
-3
8
3
5
2
65
What is the density of an object with a mass of 5 grams and a volume of 10 ml?
10 g/ml
5 g/ml
2 g/ml
0.5 g/ml
66
What does the atomic number identify?
The number of protons of a given atom.
The number of neutrons of a given atom.
The number of protons + neutrons of a given atom.
The number of elections of a given atom.
67
Is decomposition physical or chemical?
chemical
physical
68
Chemical properties are only observed when a chemical change is happening.
True
False
69
What state of matter has a set volume?
Solid
Liquid
Gas
70
How can a mixture be separated?
deposition
tools
can be taken out by hands
evaporation
71
What type of charge would an atomic nucleus have?
Neutral
Negative
Can't answer that!
Positive
72
How do nuclear power plants produce energy?
fossil fuel
fission
geothermal
fusion
73
Which type of nuclear reaction is this?
fission
beta decay
alpha decay
fusion
74
One problem with nuclear power would be_________________.
ions
radiation
cost
fusion
75
Chemistry is the study of
the universe beyond Earth.
composition & properties of matter.
living things.
the origin & history of the Earth.
76
Complete the nuclear equation:
6732Zn
6730Zn
6630Zn
6631Zn
77
What is the most commonly used element for nuclear fission?
Uranium-235
Uranium-233
Plutonium-239
Plutonium-234
78
What separation Technique is this?
Sorting
Evaporation
Filtration
Distillation
79
What are physical properties?
Observed by a chemical change or chemical reaction
Properties that are used to observe and describe matter.
