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chem comprehensive final **ALL QUESTIONS**
the empirical formula...
how many atoms are present in 1n of HCl
chem comprehensive final **ALL QUESTIONS**
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1
how many atoms are present in 1n of HCl
6.02 X 1023 atoms
none of the above
2 atoms
12.04 X 1023 atoms
2
the empirical formula...
gives you the simplest ratio of atoms in the molecule
tells you the exact number of atoms of each element in the molecule
both b and c
shows how each of the atoms are bonded to one another
3
the substance that is dissolved in the solution is called...
solvent
solution
solute
saliva
4
which is not an indicator that a chemical rxn has occurred
shape change
change in texture
none of the above are not indicators
gas given off
5
the amount of space an object occupies
volume
density
energy
mass
6
what is the most reactive metal
calcium
sodium
magnesium
potassium
7
the atomic number...
none of the above
tells the number of grams in one mole of a substance
tells the number of atoms in one molecule
tells the number of protons in the nucleus
8
the number of molecules per unit volume is known as...
mass
volume
pressure
density
9
_____ is anything that causes change or motion.
inertia
matter
mass
energy
10
relationship in which variables magnitudes go opposite directions
kinetic energy
accuracy
direct
inverse
11
the greek letter
delta...
means calorimeter
stands for divide by
none of the above
stands for a change in
12
the amount of material in an object
density
precision
mass
volume
13
bismuth is the ore of what element
aluminium
iron
silica
gold
14
which is an extensive property
color
texture
none of the above
mass
15
what 2 are conserved in a reaction
molecules
energy
atoms
moles
16
energy that is found locked in the chemical bonds of a molecule...
is potential energy
none of the above
is not useable
is kinetic energy
17
what is the most abundant element in the earth's atmosphere
argon
oxygen
nitrogen
carbon dioxide
18
exothermic and endothermic reactions
refer to heat released or absorbed during a rxn
explain energy exchanges during a rxn
follow the law of conservation of energy
all of the above are true
19
how many atoms are present in H
3
C
2
O
5
N
2
4 atoms
6.02 X 1023
12 atoms
135 atoms
20
2K
3
P + 3BaSO
4
----> Ba
3
P
2
+ 3K
2
SO
4
this equation has a total of 4 oxygen atoms on the product side
this equation has 4 elements of the product sideI
this equation has 3 molecules on the product side
this equation has 5 molecules on the reactant side
21
a control group...
all of the above
is many times the natural setting
is necessary to have a valid experiment
is used as a comparison to experimental groups
22
what element's original name was plumbum
lead
phosphorus
silicon
boron
23
what element makes up 50% of the earth's crust
oxygen
carbon
silica
phosphorus
24
all matter has
mass
all of the above
potential energy
kinetic energy
25
what is the tallest mountain in the world
pompeii
mt everest
mt rainier
mt fuji
26
OH
-1
is...
a polyatomic ion
an anion
all of the above
a diatomic ion
27
the smallest part of an element that retains the properties of that element
electron
molecule
atom
nuetreno
28
what is the most abundant element in earth's core
nickel
phosphorus
iron
silicon
29
what is
one
element that is liquid at room temperature
chlorine
flourine
mercury
neon
30
the oxidation number for Phosphate ion...
is positive
is negative 3
is -2
none of the above
31
Cd
3
P
2
would have the name of...
cadmium phosphide
cadmium phosphate
none of the above
cadmium phosphorus
32
what element has the highest melting point
astatine
zirconium
titanium
tungsten
33
when two or more atoms of different substances are chemically combined the new substance is called...
mixture
molecule
compound
element
34
the products in a rxn...
are always on the right side of the equation
all of the above are true
have the same mass as the reactants
have the same number of atoms as reactants
35
what is the empirical formula for hydrogen oxide
H2O
H2O2
none of the above
H3O
36
what colors does light contain
orange
blue
all of them
red
37
the correct molecular formula for ammonium phosphate is...
(NH4)3(PO4)2
(NH4)3PO4
(NH4)3P
(NH4)2SO4
38
what is the most abundant element in the universe
oxygen
carbon
sulphur
hydrogen
39
which of the following has 6 significant figures?
.010655
.0234322
1.00014
200000
40
the correct molecular formula for Sodium Sulfate would be
Na3SO4
Na2S
Na2SO4
NaSO4
41
causes change or motion
energy
inverse
dependent variable
independent variable
42
the limiting reactant...
is the reactant that is completely consumed in the rxn
has the excess left over after the rxn is over
is always the first reaction written in the chemical equation
all of the above
43
a scientific guess
accuracy
independent variable
hypothesis
chemistry
44
empirical
formula for a compound that has an 84g mass, if 36g are from carbon, 48g are due to the mass of oxygen
C2O2
CO2
CO
C3O3
45
einstein
scientific method
law of conservation of mass/energy
inverse
chemistry
46
the molar mass of C
2
H
3
O
2
is...
55g/n
59g
none of the above
75g
47
energy of motion
kinetic energy
energy
direct
chemistry
48
H
3
C
2
O
4
has a molar mass of 91 g/n
all of the above
is an empirical formula
contains only 3 elements
49
the number which represents how many separate particles you have, and which goes in front of the formula is called...
subscript
coalesce
avogadro's number
none of the above
50
heat...
is measured in joules in the metric system
all of the above
is the total kintetic energy of a substance
always flows from a warmer substance to a cooler one
51
aluminium oxide would have the molecular formula...
AlO
none of the above
AL2O
AlO2
52
for the reaction Na
2
S + Al ----> ______
this would be considered a single displacement reaction
one of the correct products would be S
moles of each substance would be conserved
all of the above are true
53
what is the most abundant element that makes up the sun
carbon
oxygen
helium
hydrogen
54
the degree of exactness with which something is measured
inverse
accuracy
volume
precision
55
5.22 X 10
-7
/ 445.2 = (round to the correct significant digits)
1.146 X 10-9
1.1 X 10-9
1.15 X 10-9
none of the above
56
what is the correct number of oxygen atoms in Al(NO
3
)
3
none of the above
three
nine
six
57
the empirical formula...
shows the number of atoms of each element in a compound
shows the smallest whole number ratio of atoms in a compound
none of the above
shows all atoms and how they are bonded
58
the correct oxidation number for Al is...
-5
-3
3
5
59
density...
is a ratio of weight to vomit
none of the above
is 1 g/mL for water
is a ratio of weight to volume
60
a molecule of sodium sulfate...
none of the above
would have 2 sodium atoms for every 2 oxygen atoms present
would have the molecular formula NaS
would have one sulfur atom for every four oxygen atoms
61
the unit used to measure heat is...
degrees fahrenheit/celsius
joules
all measure heat
kelvin
62
polyatomic ions...
can be anions
all of the above
can be cations
contain more than one atom
63
which is an intensive property
length
volume
mass
density
64
(circle all below) which are compounds
H2O
2C
10Ca
O3
65
the molecular interpretation states...
molecules are conserved in a rxn
that coefficients represent the mole ratio in a rxn
that coefficients represent the molecular ration in a rxn
none of the above
66
NaCl + KBr ----> KCl + NaBr
decomposition rxn
single replacement rxn
none of the above
replacement rxn
67
the factor that the scientist varies or adjusts
dependent variable
direct
independent variable
inverse
68
the correct molecular formula for potassium phosphide is...
KPO4
none of the above
K2PO4
K3PO4
69
if the mass of an object is 9.290g and its volume is 25.00mL, what is the density of the object in g/L?
.3716 g/L
none of the above
3.716 X 10-4 g/L
371.6 g/L
70
how close a measured value comes to a known value
accuracy
volume
precision
density
71
what is not considered a molecule
NaBr
O3
H2SO4
H2
72
the study of matter and energy and how they relate
hypothesis
law of conservation of mass/energy
scientific method
chemistry
73
subscripts...
tell the ratio of moles of atoms
tell the ratio of elements present
tell the ratio of atoms of each element
none of the above
74
1.3 X 10
-7
+ 2.5 X 10
-9
=
2.5013 X 10-9
2.5013 X 10-7
none of the above
1.325 X 10-7
75
exothermic reactions...
absorb energy / heat
none of the above
both of the above
release energy / heat
76
the number of grams any compound found in 1n of that compound is known as the...
Avogadro's number
molar mass
none of the above
2 atoms
77
molecules...
always contain two or more atoms of different elements
always contain two or more atoms
have physical bonds
none of the above
78
which are not considered molecules
none of the above
O2
NaHCO3
NaCl
79
55.65 + 44.335 - 65.4 =
34.585
34.6
none of the above
165.4
80
the molecular formula for sodium oxide is...
NaO2
none of the above
NaO
Na2O
81
what measures heat
thermometer
all of the above
calorimeter
thermostat
82
in 3H
3
PO
4
...
none of the above
there are 3 atoms present
there are 12 oxygen atoms
there are 7 phosphorus atoms
83
for the reaction CaCl
2
+ 2NaBr ----> 2NaCl + CaBr
2
there are 6 atoms in the reactants
there are 3 molecules in the products
all of the above
there are 6 elements present in the products
84
the unit in the metric system used to measure heat is...
kelvin
calorie
joule
joule/goC
85
how many US senators are there
200
135
100
50
86
ions...
may contain more than one atom
have a proton-electron imbalance
all of the above
are any charged particle
87
when a chemical change occurs
a completely new substance is formed
atoms are rearranged in some fashion
heat is either gained or lost
all of the above
88
a sample of a compound with 23g of sodium and 4.66g of nitrogen would have an empirical formula of...
Na3N
NaNO3
Na2N
NaN.33
89
relationship in which variable magnitudes go the same direction
direct
hypothesis
kinetic energy
inverse
90
the variable that the scientist adjusts in an experiment is known as the
independent variable
dependent variable
direct variable
incoherent variable
91
what is the
other
element that is liquid at room temperature
aluminium
argon
iodine
bromine
92
what is the most abundant compound on earth by mass
carbon
silicon
oxygen
phosphorus
93
the smallest partical that retains the properties of that element is called...
atom
molecule
neutron
electron
