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Chemical Reactions Bonding Stoichio-
metry Gas Laws Solutions
100 100 100 100 100
200 200 200 200 200
300 300 300 300 300
400 400 400 400 400
500 500 500 500 500
Chem Rxns : 100
Identify the type of reaction and balance:
NaOH + CaBr2 Ca(OH)2 + NaBr
Back
Answer: Double Replacement (2:1:1:2)
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Identify the type of reaction and balance:
H2O H2 + O2
Answer: Decomposition (2:2:1)
Chem Rxns : 200
Back
Name all the types of chemical reactions and give their
examples using A, B, C, and D.Answer: Synthesis (A + B AB)
Decomposition (AB A + B)Single Replacement (AB + C AC + B)
Double Replacement (AB + CD AD + CB)
Chem Rxns : 300
Back
How does the law of conservation of mass relate
to chemical equations?Answer: Since matter cannot be created or
destroyed, chemical equations must be balanced to account for all reactants and products.
Chem Rxns : 400
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What is the balanced word equation for this chemical reaction:
FeCl3 + Zn Fe + ZnCl2Answer: 2 moles of iron (III) chloride reacts with 3 moles of zinc to yield 2 moles of iron
and 3 moles of zinc chloride.
Chem Rxns : 500
Back
Identify the type of bonding and the name of
CuCl2.Answer: Ionic Bonding,
Copper (II) Chloride
Bonding : 100
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Describe what happens in metallic bonding.
Answer: Negatively charged electrons move freely around positively charged ions of metals which bonds the atoms together.
Bonding : 200
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Identify the type of bonding and name of
H2O.Answer: Covalent, dihydrogen
monoxide.
Bonding : 300
BONUS
BONUS: 200 points
Describe the electron distribution in the bonding
of H2O.Answer: Polar bond because
electrons more attracted to the oxygen atom.
Back
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Which bonding is stronger: ionic or covalent? Why?
Answer: covalent because electrons are shared between the
two atoms so more energy would be needed to separate the atoms.
Bonding : 400
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Which type of bonding allows molecules to conduct electricity strongly
in solid phase?
in aqueous phase? Why?Answer: Solid = metallic, because sea of
electrons will allow electrons to pass throughAqueous = ionic, because dissociated ions are charged and will allow electrons to pass through
Bonding : 500
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How many moles of oxygen are needed to react with 4 moles of
hydrogen?
H2 + O2 H2O
Answer: 2 moles of O2
Stoichiometry : 100
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If you have 2.5 moles of potassium sulfate, how many grams of potassium sulfate do
you have?Answer: 453.10 g K2SO4
Stoichiometry : 200
Back
Define limiting and excess reactants.
Answer: Limiting = substance completely used up in the reaction and determines how
much product can be formedExcess: substance not completely used up in
the reaction
Stoichiometry : 300
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You want to make 70 g of aluminum sulfate. How many grams of each
reactant do you need?
AlBr3 + K2SO4 KBr + Al2(SO4)3
Answer: 109.11 g AlBr3
and 106.96 g K2SO4
Stoichiometry : 400
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If you have 50 g of oxygen and 100 g C2H4, how many moles of
water can you make?
C2H4 + O2 CO2 + H2O
Answer: 1.04 moles H2O
Stoichiometry : 500
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What is the relationship between pressure and volume? Describe
what its graph looks like.Answer: Inverse because as pressure increases, volume will decrease. The graph is a curve line with a downward
slope.
Gas Laws : 100
Back
In Zain keeps 4 moles of gas in a container with a volume of 70 L at
a temperature of 500 K, what is the pressure inside the container?
Answer: 2.34 atm
Gas Laws : 200
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List all 5 gas laws and their equations.
Answer: Charles (V1/T1=V2/T2)Lussac (P1/T1=P2/T2)
Boyle (P1V1=P2V2)Combined (P1V1/T1=P2V2/T2)
Ideal (PV=nRT)
Gas Laws : 300
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Mr. Kaplan has 72 L of a gas that he holds at a pressure of 3.4 atm and a temperature of 256 K. How many moles of gas does he have?
Answer: 13.25 mol
Gas Laws : 400
A gas has the following properties: volume of 17 L, pressure of 2.3 atm,
and temperature of 150 K. If Ms. Yang doubles the temperature and
decreases the pressure in half, what is the new volume of the gas?
Answer: 68.00 LBack
Gas Laws : 500
Back
What is the equation to find molarity?
(name the variables)Answer: Molarity (M) = number of
moles of solute (n) / volume of solution (V)
Solutions : 100
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What is the equation for dilution molarity?
(name the variables)Answer: Initial Molarity (M1) * Initial Volume (V1) = Final Molarity (M2) * Final Volume (V2)
Solutions : 200
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If beaker A is an unsaturated solution and we add more solute to the breaker, what should we expect to see happen to the number of solid and dissolved
solute particles?Answer: dissolved = increase,
solid = stay zero until solution is saturated
Solutions : 300
Answer: 25 mL of solution A
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Solution A has a molarity of 0.5 M. If you want to make 50 mL of solution B which has a molarity of 0.25 M, how
many milliliters of Solution A would you need?
Solutions : 400
Back
Solution C contains 3.0 moles of CaCO3 in
400 mL. Solution D conatins 35 grams of H2SO4 in 5.0 L of solution. Which solution
is more concentrated?(mm CaCO3 = 100.09 g/mol, mm H2SO4 = 98.08 g/mol)
Answer: Solution C (7.5 M) > Solution D (0.07 M)
Solutions : 500