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Chemistry Midterm
Chemistry Midterm
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1
Give a balanced chemical equation for the decomposition of H
3
PO
4
.
3H2 + 2P + 4O2 --> 2H3PO4
2H3PO4 --> 3H2 + 2P + 4O2
3H3PO4 --> 3H2 + 2P + 4O2
H3PO --> H2 + P + O2
2
Which is an example of a decomposition reaction?
2 H2O2 → 2 H2O + O2
2Na + Cl2 → 2NaCl
AgNO3 + NaCl → AgCl + NaNO3
2AgNO3 (aq) + Zn (s) → 2Ag (s) + Zn(NO3)2 (aq)
3
Hydrated cobalt (II) chloride has a chemical formula of CoCl
2
•6H
2
O. What is the chemical formula of the anhydrous form?
CoCl2•6H2O
6H2O
CoCl2•3H2O.
CoCl2
4
Molarity measures what?
how many L of solvent
limiting reaction
how many moles in the solute
concentration
5
What physical quantity is measured with kL?
Distance
Volume
Time
Mass
6
Put the following atoms in order of their electronegativity, from lowest to highest?
Si, Ti, F, Cs
F, Si, Ti, Cs
Ti, F, Cs, Si
Cs, Ti, Si, F
7
An element has 19 protons and 21 neutrons. What is its symbol, including the mass number?
20K
19Sc
40K
40Sc
8
Which of the following is a chemical change?
crushing a can
Water boils
dissolving salt into water
Strontium chloride is decomposed into strontium and chlorine
9
Bent and pyramidal are the only two shapes that are polar based on shape?
True
False
10
Define Ground State:
A change which does not alter the chemical composition of a substance
The lowest energy state of a particle
An atom that develops an electrical charge by gaining or losing electrons
A chemical bond made up by sharing electrons
11
The molecule NF
3
will be which shape?
trigonal
tetrahedral
bent
pyramidal
12
Definition of Limiting Reactant
A process by which a chemical reacts with oxygen to form new products
A reaction in which or ion in a compound is replaced by a different ion
The reactant that runs out first
Reaction in which carbon monoxide or carbon in addition to water are formed
13
Definition of Mass:
A measure of how much matter exists in an object
A measurement of how strongly gravity pulls an object
A digit in the measurement that contributes to the measurement’s precision
A quantity that describes the measurement being made
14
What is the formula for wavelength?
λ = speed of light / frequency
λ = Hz / c
λ = Hz
λ = height of wave/ length of wave
15
What is the formula for Molarity
moles of solute/ grams of solvent
moles of solute/Kilograms of solvent
moles of solvent/mL of solution
moles of solute/ Liters of solution
16
What particles are found in the nucleus of an atom?
Neutrons
Protons and Neutrons
Protons and Electrons
Electrons and Neutrons
17
What is the most abundant isotope of carbon?
12C
40Ca
11C
13C
18
How many moles are found in a 100.0 g sample of CCl
4
?
0.6502 moles
35.45 moles
153.8 moles
12.01 moles
19
A sample has a mass of 0.112 kg. What is the mass in mg?
112,000 mg
112 mg
112 g
0.000000112 mg
20
The molecule SiO
2
will be which shape?
pyramidal
bent
linear
tetrahedral
21
Which of the following is a physical change?
baking cookies
boiling sugar water
frying an egg
burning wood
22
Which orbital does the picture represent?
f orbital
s orbital
d orbital
p orbital
23
Solute- the substance or substances dissolved into a solution
False
True
24
What is a covalent bond?
A chemical bond that is made by sharing electrons
A measure of how strongly atoms attract electrons
A pure substance that is composed of two or more elements
The distance from the center of the nucleus to the atom’s valence electrons
25
Which sub atomic particle has no charge?
a proton
an atom
an electron
a neutron
26
Definition of Isotopes:
The lowest energy state of a particle
A reaction in which 1 element in a compound is replaced by a different on 1
Two or more atoms of the same element that have different # of neutrons
Readily absorbs moisture from the atmosphere
27
Convert 16.2 kg into grams:
0.0162 g
16,200 g
1.62 g
162 g
28
What is the chemical formula for copper(II) chloride?
Cl2Cu
CCl2
Cu2Cl
CuCl2
29
What does Avogadro's number tell us?
The size of an element
How many molecules per mole
How much a element weighs
How many molecules per atom
30
Which of the following are in the Alkali Earth metal family?
C, Si, Pb
O, S, Se
Na, K, Li
Mg, Ca, Ra
31
Which of the following situations is an example of gaining energy?
Liquid water freezing.
A substance going from a gaseous phase to a liquid phase.
A substance turning from a solid to a liquid.
A cloud dropping rain.
32
What is the full ground-state electron configuration for sulfur?
1s22s22p63s23p1
1s22s22p63s2
1s22s22p63s23p4
1s22s22p63s23p6
33
This picture represents what type of orbital?
d orbital
p orbital
f orbital
s orbital
34
A complete combustion reaction only makes carbon monoxide and oxygen.
True
False
35
Which of the following is a single displacement reaction?
CH4(g) + 2 O2(g) → CO2(g) + 2H2O(g)
2 H2O → 2 H2 + O2
2 H2 + O2 → 2 H2O
Mg (s) + 2HCl (aq) → H2 (g) + MgCl2(aq)
36
SrCl
2
(aq) + NaOH (aq) -> Sr(OH)
2
(s) + 2 NaCl (aq) Which is insoluble in water?
NaOH
NaCl
Sr(OH)2
SrCl2
37
Which of the following equations is balanced?
3 Mg (s) + 2 AlCl3 --> 2 Al (s) + 3 MgCl2
6 Mg (s) + 4 AlCl3 --> 5 Al (s) + 6 MgCl2
Mg (s) + AlCl3 --> Al(s) + MgCl2
2 Mg (s) + 3 AlCl3 --> 3 Al (s) + 2 MgCl2
38
Put the atoms in order of their size from smallest to largest.
Si, F, Cs, Ti
Cs, Si, Ti, F
F, Si, Ti, Cs
Ti, F, Cs, Si
39
What is the mass in grams of 169 moles of CO
2
?
678 grams
44.0 grams
825,000 grams
7,440 grams
40
How many centimeters in one inch?
3.00 cm
5.24 cm
12 cm
2.54 cm
41
What are valence electrons?
A quantity in nature that never changes
An atom’s outermost electrons
Chemicals that for a conductive solution when dissolved
A molecule consisting of two of the same elements
42
What is the formula for density?
mass X volume
mass/volume
volume/mass
43
Law of Conservation of Mass:
True
False
44
Which type of orbital is represented by the picture?
d orbital
p orbital
s orbital
f orbital
45
A chemist is studying two isotopes of argon. The second has less mass than the first. Which has more neutrons?
1st
2nd
46
Which of the following is a synthesis or formation reaction?
2NO + O2 → 2NO2
BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)
Mg (s) + 2 HCl (aq) → H2(g) + MgCl2 (aq)
H2CO3 → H2O + CO2
47
What is the abbreviated ground-state electron configuration for bromine (Br)?
[Ar]4s23d104p2
[Xe] 4s23d104
[Ar]4s23d104p5
[Xe] 4s23d104p5
48
Which of the following atom is an isotope?
An atom with 20 protons, 20 electrons, and 21 neutrons
An atom with 21 protons, 20 electrons, and 21 neutrons
An atom with 20 protons, 21 electrons, and 22 neutrons
An atom with 22 protons, 22 electrons, and 22 neutrons
49
What is the chemical formula and name of the compound formed by magnesium and phosphorus?
Mg3P2 magnesium phosphate
Mg2P3 magnesium phosphate
Mg2P3 magnesium phosphide
Mg3P2 magnesium phosphide
50
Which of the following is a chemical change?
ammonium chloride is dissolved in water
blowing up a balloon
water freezing
A single displacement reaction
51
2Na(s) + 2H
2
O(l) -> 2NaOH (aq) + H
2
(g) If 4.52 g of Na react with an excess of water, how many grams of H
2
are formed?
22.99 g
0.199 g
23.0 g
.018 g
52
Which light wave has a higher energy?
yellow
red
green
violet
53
What is the frequency of light that has a wavelength of 2.12x10
-7
m? ( c=3.00x10
8
m/sec)
1.42x1015 J
1.42x1015 m/sec
1.42X1015 nm
1.42x1015 Hz
54
Define Kinetic Theory of Matter:
Anything that has mass or takes up space
ie. The hotter the substance, the faster the motion.
A concept that light & particles have the properties of waves & particles
A measure of how tightly packed the matter in a substance is
55
What is Avogadro's number
1.04×1023
6.02×10-22
6.02×1023
5.02×10-8
56
The molecule CCl
4
will be which shape?
linear
tetrahedral
trigonal
pyramidal
57
An object has a density of 1.2 g/mL Will it float in water?
yes
no
58
Which is an example of a double displacement?
2K + 2H2O → 2KOH + H2
3 H2(g) + N2(g) → 2 NH3(g)
2H2O → 2H2 + O2
Na2S + 2HCl → 2NaCl + H2S
