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JHS Chemistry Final Exam Fall 2022

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Last updated over 3 years ago
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If the temperature of a sample of gas is increased while maintaining constant pressure what happens to the volume?
not enough information provided
it increases
nothing happens
it decreases
If the temperature of a gas is kept constant, the pressure and volume of the gas are
directly proportional.
inversely proportional.
also unchanging.
independent of one another.
Which of the following defines standard temperature?
25°C
373 K
0°C
100°C
Which of the following defines standard pressure?
1 atm
0 atm
760 atm
10 atm
Raising the temperature of a gas in a fixed volume container will most likely change the
density of the gas in the container.
pressure exerted by the gas in the container.
number of particles in the container.
size of the gas particles in the container.
The particles in a solid are
very far apart.  
packed closely together.
able to slide past each other.
never in motion.
When the temperature decreases during a chemical reaction this described as a(n)________ reaction.
exothermic
endothermic
precipitate
synthesis
According to the kinetic-molecular theory, particles of matter are in constant motion in
solids only.
gases only.
solids, liquids, and gases.
gases and liquids.  
Which set of characteristics correctly describes an ionic compound?
low boiling point, usually solids at room temperature
low boiling point, usually liquids or gases at room temperature
high boiling point, usually liquids or gases at room temperature
high boiling point, usually solids at room temperature
The origin of the word acid relates to how acids tend to taste, which is best described as
sweet.
sour.
bitter.
salty.
A smooth, slippery feel is associated with
acids.
salts.
indicators.
bases.
What is the correct name of the acid HNO3?
hydronitric acid
nitrous acid
nitrate acid
nitric acid
The correct name of the acid HBr is
bromous acid
bromic acid
hydrobromic acid
hydrobromous acid
The pH of a basic solution is
less than 7.
less than 0.
greater than 7.
greater than 14.
Which of the following substances will NOT dissolve in water?
Na2SO4
CaCO3
AlBr3
NaCl
How does a covalent bond differ from an ionic bond?
An ionic bond involves 2 electrons and a covalent bond involves 4 electrons.
Ionic bonds are usually found in acids and covalent bonds are usually found in bases.
An ionic bond is usually between two metals and a covalent bond is usually between two nonmetals.
An ionic bond is the transfer of electrons and covalent bond is a sharing of electrons.
Write out and balance the following chemical equation:
zinc reacts with iron (III) chloride yielding zinc chloride and iron
Zn  +  Fe3Cl  →  ZnCl  +  3Fe
Zn  +  FeCl3  →   ZnCl3  +  Fe
3Zn  +  2FeCl3  →  3ZnCl2  +  2Fe
Zn  +  2Fe3Cl   →   ZnCl2  +  6Fe
What is the name of the compound whose formula is (NH4)3PO4?
none of these are correct
polyammonium phosphate
ammonium phosphate
triammonium quatrophosphate
What is the name of the compound whose formula is FeSO4?
iron sulfate
iron (I) sulfate
iron (II) sulfate
iron (I) sulfide
What is the name of the molecular substance PCl5?
phosphorous heptachloride
monophosphorous pentachloride
phosphorous pentachloride
phosphorus chloride
In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants?
oxygen only
water
hydrogen only
both hydrogen and oxygen
What is the molar mass of water?
1 g/mol
18 g/mol
44 g/mol
17 g/mol
How many total atoms are there in this expression 3Al2(SO4)3?
21
15
30
51
Which of the following is an empirical formula?
CH4O
C4H2O8
C6H12O6
C2H2O4
What is the formula (molar) mass of Ca(NO3)2?
164.10 g/mol
70.20 g/mol
142.30 g/mol
102.20 g/mol
The symbol (s) written after a formula in a chemical equation stands for
synthesis
solid
soluble
solution
Two white powders are mixed in a flask. The bottom of the flask feels warmer. This is an example of what kind of reaction?
exothermic
combustion
endothermic
isothermic
What number is represented by “∆” to balance the equation:  ∆Na + MgCl2 →  NaCl  +  Mg   ?
3
1
4
2
What will happen if a lead metal strip is placed into a solution of zinc nitrate? (hint: write out the equation first; what kind of reaction is it?)
more lead metal will be formed
zinc and lead will combine to form a double metal compound
no reaction will occur
lead will replace zinc in the solution
Which of the following normally exists as a diatomic molecule?
chlorine
neon
sulfur
sodium
What mass of phosphorous would be needed to produce 3.25 mol of P4O10 in the following reaction?
4 P (s) + 5 O2 (g) →   P4O10 (s)
119 g
0.42 g
25.2 g
403 g
How many grams of oxygen are required to react completely with 0.38 grams of hydrogen to form water?  __O2 + __H2 -> __H2O (hint: make sure it’s balanced!)
1.0 g
3.0 g
6.0 g
12.0 g
How many valence electrons does an element with an electron configuration of 1s22s22p63s23p5 have?
7
4
2
5
An atom will bond with another atom if both atoms have
equal numbers of valence electrons.
full sets of valence electrons.
incomplete sets of valence electrons.
different numbers of valence electrons.
In the reaction N2 +  3H2 →  2NH3, what is the mole ratio of nitrogen to ammonia?
1:1
2:3
1:3
1:2
The Haber process for producing ammonia commercially is represented by the equation:
N2 (g) + 3H2 (g) →  2NH3 (g)
To completely convert 9.0 mol hydrogen gas to NH3 gas, how many moles of nitrogen gas are required?
3.0 mol
1.0 mol
2.0 mol
6.0 mol
For the reaction  2Na +  2H2O  →  2NaOH  + H2, how many grams of sodium hydroxide are produced from 3.0 mol of water?
40. g
120 g
240 g
80. g
Valence electrons are those
combined with protons.
in the outermost energy level.
in the lowest energy level.
closest to the nucleus.
The number of valence electrons that Group 15 elements have is
3
15
equal to the period number.
5
How many electrons does an atom of Magnesium that has a +2 charge have?
2
14
+2
10
Name the compound N2O4.
nitrogen tetroxide
nitrogen oxide
sodium tetroxide
dinitrogen tetroxide
How many neutrons does an average atom of Uranium have?
146
92
148
238
Which subatomic particle determines the identity of the atom?
protons
neutrons
electrons
valence electrons
What element has this noble gas electron configuration [Xe]6s2?
Strontium
Xenon
Barium
Calcium
Elements in a group in the periodic table can be expected to have similar
properties
atomic numbers
numbers of neutrons
atomic masses
What is the common charge for Nitrogen?
+3
5
-3
15
How many valence electrons does Chlorine have?
-1
17
+1  
7
The molar mass of NH3 is 17.04 g/mol. How many moles of NH3 are present in 107.1 g?
107.1 mol
0.1623 mol
6.289 mol
3.614 mol
What are the products of a combustion reaction?
Water & oxygen
A hydrocarbon & oxygen
A hydrocarbon & carbon dioxide
carbon dioxide & water
Approved eye protection devices (such as goggles) are worn in the laboratory
to improve your vision.
to avoid eye strain.
only if you don’t have corrective glasses.
any time chemicals, heat or glassware are used.
Which of the following elements is a metalloid?
Sn
Ga
Al
Si
A sample of hydrogen gas had a volume of 455 L at 20°C and 755 mmHg. What would be its volume at 100°C and 565 mmHg?

Formula: P1V1 = P2V2
T1 T2
478 L
774 L
11400 L
3040 L
The pressure of a 250 mL sample of gas is 105 kPa. What would be the pressure if the volume was increased to 375 mL?

Formula: P1V1 = P2V2
T1 T2
1.2 kPa
774 L
70. kPa
160 kPa
What family does Bromine belong to?
3
4
halogens
noble gases
What type of compound requires a roman numeral in its name?
molecular
ionic with a transition metal
ternary ionic
ionic with a polyatomic ion
A compound contains 32.38% sodium, 22.65% sulfur, and 44.99% oxygen. What is the empirical formula of the compound?
d. Na8S4O16
Na3S2O4
b. Na4S2O8
Na2SO4
The molar mass of a carbon, hydrogen, and oxygen compound is 180 g/mol. If the empirical formula is CH2O, what is its molecular formula?
a. CH2O
c. C6H12O6
b. C3H4O3
d. CHO
What is the percentage of calcium in calcium phosphide?
30%
55.8%
56%
66%
Which element is the only nonmetal located on the “metal side” of the periodic table?
boron
helium
hydrogen
lithium
The following data about a metal was collected in the lab. What is its density?
7.3 g/cm3
0.14 g/cm3
9.18 g/cm3
7.8 g/cm3
What type of reaction is this?
Ba(OH)2 → BaO + H2O
Double Replacement
Decomposition
Combustion
Synthesis
Single Replacement
What type of reaction is this?
2Mg (s) + O2 (g) → 2MgO(s)
Decomposition
Synthesis
Combustion
Double Replacement
Single Replacement
What type of reaction is this?
C3H8 + 5O2 → 3CO2 + 4H2O
Single Replacement
Synthesis
Combustion
Decomposition
Double Replacement
What type of reaction is this?
Cl2 (g) + 2 KBr (aq) → 2KCl (aq) + Br2 (l)
Decomposition
Double Replacement
Combustion
Single Replacement
Synthesis
What type of reaction is this?
Na2O + 2AgNO3 → 2NaNO3 + Ag2O
Decomposition
Combustion
Single Replacement
Synthesis
Double Replacement