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Chemistry 100 Questions final
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1
What is an example of physical reaction
Painting a fence
Photosynthesis
2
what is the percent yield if the theoretical yield is 100g and actual yield is 46g
46% yield
141% yield
64% yield
3
What is the one hundred fourteenth element on the periodic table?
Ununquadium
Hydrogen
Boron
Ununbium
4
Define heterogeneous…
unified structure or composition throughout
composed of dissimilar components
5
true or false Acids have a pH level below 7.
True
False
6
Write Bromine Pentafluoride
FeF5
Bromine
BrF5
BF5
7
What is the chemical equation for ammonia
NH3
N3H
NHO3
8
Energy is...
The darkside
Chemistry
The capacity to do some kind of work
The force
9
Which Gas Law is P1xV1=P2xV2
Charles' law
Derek's Law
Boyle’s law
10
How many protons are in Argon?
18 Protons
23 Protons
11
A chemical can be defined as…
any substance that has an indefinite composition
any gas that has an indefinite composition
any substance that has a definitive composition
12
NaOH
Sodium Hydroxide
Pi
Undefined
Calcium Cloride
13
Name the following chemical compound: NaBr
Sodium barium
Sodium bromide
14
balance this equation... KClO3 --> KCl + O2
KClO3 (s) --> 2KCl (s) + 3O2 (g)
2KClO3 (s) --> 2KCl (s) + 3O2 (g)
15
which poly-atomic Ion has a positive charge of 1
Ammonium
Cibrit
Ammoniya
16
Balance: C3H8+ O2 = + CO2 + H2O
2 NH3 + 3 CuO = 3 Cu + N2 + 3 H2O
C3H8 + 5 O2 = 3 CO2 + 4 H2O\
17
Is Concrete a Pure Substance or a Mixture
Mixture
Pure Substance
18
Where is the emergency shower located in chemistry room?
Inside the room
Outside the room to the left
Outside the room to the right
19
3.5 moles of calcium=_______grams
140 grams
145 grams
135 grams
20
The nucleus of an atom consists of...
electrons and neutrons
electrons and protons
protons and neutrons
All of the Above
21
Convert 100C to Kelvin
373 Kelvin
100 Kelvin
300 Kelvin
370 Kelvin
22
What is the correct form of Advogados number
6.03x1023
7x10
6.02x1023
4
23
What is the second element on the periodic table?
Ununquadium
Oxygen
Helium
Hydrogen
24
Whose law said the principle that, for relatively low pressures, the density of an ideal gas...
Boyle's Law
Gay-Lussac’s Law
Avagadro's Law
Combined Gas Law
25
Define homogeneous…
unified structure or composition throughout
Separated structure or composition throughout
26
Convert to Kelvin 34c
307k
345k
34c
12k
27
Will Potassium(K) react with Calcium(Ca)
No
Yes
Maybe So
28
Whose law said that the rate of effusion of a gas is inversely proportional to the square root.
Boyle's Law
Ideal Gas Law
Graham's Law
Charles's Law
29
Atoms of the same chemical element that have different atomic mass are known as?
Cuntriboiions
Ionic bonds
Isotopes
Poly-Atomic Ions
30
Express 1,000,000 m to scientific notation
1.0x104
1.0x105
1.0x106
31
Write the formula the following compound: silicon dioxide
SiO2
Si2O
32
The rarest gas in the atmosphere is
HCL
Desium
Argon
33
How many atoms are in 0.652 mol of iron?
4 atoms
Africa
3.93x10^23
6g
34
What is the charge of a Neutron
Negative
Positive
No charge
35
What is the third most common gas found in the air we breathe?
Nitrogen
Helium
Oxygen
Argon
36
How many grams of carbon dioxide are there in a container with a volume of 4.50L at STP?
23g
2.401g
2.41g
213415g
37
How many moles of nitrogen are there in a 7.45 mol sample of ammonium phosphate?
22.44 Mol
37.13 Mol
0.324 Mol
22.4 Mol
38
balance this equation... NaCl+F2 --> NaF + Cl2
Already balanced
2NaCl+F2-> 2NaF + Cl2
KClO3 (s) --> 2KCl (s) + 3O2 (g)
39
Which element is a transition metal
Copper
Oxygen
Chemistry
40
What is considered the "Universal solvent"
Gas
Acid
Water
Poison
41
A chemical is...
Something magical :)
Any substance that has a definite composition
42
The hydronium ion is...
H3O+
What is hydronium?
H304-
43
If gas is held at a constant pressure, its volume is directly proportional to the temperature?
Charles’s Law
Graham's Law
Boyle’s Law
44
Which of these is an element
Cu
W
Zcn
America
45
Balance: NH3 + CuO = Cu + N2 + H2O
C3H8 + 5 O2 = 3 CO2 + 4 H2O\
2 NH3 + 3 CuO = 3 Cu + N2 + 3 H2O
46
Which element has the largest molar mass
Na
F
Li
Rb
47
What law states that, “the equation of state of a hypothetical ideal gas?”
Ideal Gas Law
Combined Gas Law
Boyle's Law
48
balance this equation... F2 (g) + NH3 (g) --> N2F4 (g) + HF (g)
Unbalance-able
5F2 (g) + 2NH3 (g) --> N2F4 (g) + 6HF (g)
F2 (g) + NH3 (g) --> N2F4 (g) + HF (g)
Already Balanced
49
Identify the type of reaction:NaCl→
Decomposition reaction
Combustion
50
Which element is a noble gas
Copper (II) sulfate
Hydrogen
Copper
51
sample contains 27.1 g of calcium oxide. How many moles of calcium oxide are in the sample?
.634 moles
2 moles
Chem is try
.483moles
52
Which is larger
10 km
10 dm
53
Where are the noble gasses located on the periodic table?
The left side of the periodic table
The middle of the periodic table
The right side of the periodic table
54
What is an example of a chemical reaction
Photosynthesis
Cracking an egg
55
What is the charge of a proton
Negative
Positive
No charge
56
Group 2 on the periodic table is referred to as the______ _____ metals
alkaline earth
light metals
solid metals
57
Write the chemical equation for potassium oxide...
K3O2
KO2
K2O
58
The first metal used by man was....
Carbon
Copper
Iron
Yee
59
What is di-hydrogen monoxide
Cancer
Poison
Flammable Liquid
Water
60
How many moles of nitrogen are there in a 7.45 mol sample of ammonium phosphate?
22.4mol
27.13mol
61
What is the fourth element on the periodic table?
Gold
Ununquadium
Boron
Copper
62
Convert 4568 centimeters to kilometers
0.04568
45.68
4.568
63
Is Limestone (CsCO
3
) a Pure Substance or Mixture
Pure Substance
Mixture
64
What is the third element on the periodic table?
Boron
Calcium
Ununquadium
Lithium
65
Find the number of moles in CO2 that weighs 454 grams.
10.3 moles
1 mole
7.3 moles
66
What elements are found in the chemical compound sucrose? (Alphabetical order)
Carbon, Helium, Oxygen
Carbon, Hydrogen, Oxygen
67
The absolute pressure and the volume of a gas are inversely proportional is who's law?
Boyle’s Law
Avogadro's law
Charles’s Law
68
Is CaCl2 a Ionic or Covalent compound
Ionic
Neither
Covalent
69
The luster of a metal is due to
Polish
Electromagnetic pulses
presence of free electrons
70
What law states that pressure, volume and temperature together create a constant?
Ideal Gas Law
Boyle's Law
Charles's Law
Combined Gas Law
71
Compared to the charge and mass of a proton, an electron has
an opposite charge and a smaller mass
n opposite charge and a smaller mass
the same charge and the same mass
the same charge and the same mass
72
The molecular formula of phosphorus is....
P2
K
P4
73
What is chemistry
Crying in a corner
It is try fam
Failing
Lyfe
74
When electrons in an atom in an excited state fall to lower energy levels, energy is
released, only
neither released nor absorbed
both released and absorbed
absorbed, only
75
Concrete is a element, compound, homogeneous, or heterogeneous
homogeneous
compound
element
heterogeneous
76
What orbits the nucleus of an atom?
Electrons
Neutrons
Protons
77
Density=______
volume/pressure
mass/volume
volume * heat
78
Convert to Celsius 273K
273 c
0 c
1 c
79
Which Gas Law is V1/N1=V2/N2
Sir Issac Yee law
Ideal gas law
Avogadro's Law
80
Convert -12 C to kelvin
1000K
261K
400K
300K
81
balance this equation... KClO3 --> KCl + O2
already balanced
7
KClO3 --> KCl + O2
82
Is burning paper a physical or chemical reaction?
Chemical
Phisical
83
Groups 3-12 on the periodic table are referred to as the _________ metals
light
transition
heavy
84
The mass number of an atom is equal to....
Atomic weight
Dr.Pepper
The molar mass
the number of nucleons
85
A 4 g sugar cube,C
12
H
22
O
11
is dissolved in a 350 mL cup. What is the molarity of the solution?
M = 1.133 mol/L
M = 0.033 mol/L
M = 0.533 mol/L
86
The most malleable metal is
Magnesium
gold
silver
copper
87
The molar mass of an element is…
The mass in grams of one mole of the element
Only amount of Protons
Only amount of Neutrons
88
What is the center of an atom called?
An Element
A nucleus
89
balance this equation... NO + Cl2 --> NOCl
Already Balanced
NO + 2Cl2 --> 2NOCl
2NO + Cl2 -->2 NOCl
90
Equal volumes of all gases, at the same temp. and pressure, have the same number of molecules?
Gay-Lussac’s Law
Avogadro's law
Boyle's Law
91
What is the charge of an electron
Postive
Negative
No charge
92
A non metal and a metal make a...
Material
Covalent Bond
Ionic Bond
93
balance this equation... C3H8+O2-->H2O+CO2
C3H8+5O2-->4H2O+3CO2
C3H8+5O2-->6H2O+3CO2
C3H8+O2-->H2O+CO2
94
Identify the type of reaction: 2H2 + O2→
Synthesis
Single Replacement
Double Replacement
95
Who started the creation of the periodic table?
Mendeleev
Ms. Johnson
Avagadro
Boyle
96
The number of protons that an atom has is known as the atom’s...
Atomic Mass
Atomic Number
97
What is the symbol for the element Potassium
Ta
K
P
Po
98
Convert 10 dm to Dm
.01
1
.001
.1
99
Name the following chemical compound: HCl
Hydrochloric acid
Hydrogen Chloride
100
Convert 23 C to kelvin
211k
296k
400k
