Balancing & Stoichiometry
Balance the following
_CH₄ + _O₂ → _CO₂ + _H₂O
CH₄ + 2O₂ → CO₂ + 2H₂O
Ba3(PO4)2
Ba: +2
P: +5
O: -2
Which is the precipitate from the following reaction?
Pb(NO₃)₂(aq) + 2KI(aq) → ________________
(Yes, show all the work, a.k.a. equation w/ states of matter AND circle the precipitate)
Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq)
Precipitate: PbI₂(s)
What happens to the temperature if the volume increases.
It also increases
How many plates of Halloween do I have in my house?
8 :0
CH₄ + O₂ → CO₂ + H₂O
If you have 10 grams of methane, reacting with excess oxygen. How many moles of carbon dioxide you will get?
0.623 moles of carbon dioxide
Determine which element is being reduced and which elements is being oxidized.
Zn + Cu²⁺ → Zn²⁺ + Cu
Oxidized: Zinc
Reduced: Copper
Determine the precipitate from the following reactants:
Iron(III) chloride and sodium hydroxide
(For precipitate write the formula AND name)
FeCl₃(aq) + 3NaOH(aq) → Fe(OH)₃(s) + 3NaCl(aq)
Precipitate: Iron(III) hydroxide (Fe(OH)₃)
A gas mixture of pressure 47.9878 mmHg at 777K. The mixture is analyzed and is found to contain 12.271 mol CO2, 1.0401 mol CO, and 0.8750 mol Ar. Find partial pressure of CO in atm.
0.0631 atm
When is Halloween? (Day of the week, # of day, and month)
Yes, Thursday, 31, of October (of course).
2 H₂ + O₂ → 2 H₂O
If you have 10 grams of hydrogen and 20 grams of oxygen, which is the limiting reactant and how many grams of water can be produced?
22.53 grams of water :0
Give the reducing agent and the oxidizing agent form the following redox reaction:
SO2 + O2 → SO3
Reducing agent: S
Oxidizing agent: O
;0
HCl + CaCO₃ → CaCl₂ + H₂O + CO₂.
If you have 250 mL of a 0.5 M hydrochloric acid solution, how many grams of calcium carbonate can it react with?
6.25 grams of calcium carbonate.
A sample of gas occupies 25.0 L at 25°C and 760 mmHg. What is the volume of the gas at 100°C and 800 mmHg?
around 29.5 L
What agar plate is used for growth of "fastidious" organisms, such as Neisseria gonorrhoeae?
A) Blood agar plate
B) MCK plate
C) TSA plate
D) EMB plate
E) Chocolate plate
F) MSA plate
G) Liquid media
H) idk
YES, CHOCOLATE AGAR PLATE :0
Mg + 2 HCl → MgCl₂ + H₂
If you start with 5 grams of magnesium and 10 grams of hydrochloric acid, what is the amount produced of hydrogen gas?
0.415 grams of hydrogen gas.
Give the complete and balanced half reactions for the following redox reaction:
CuSO4 + KI → CuI + I2 + K2SO4
Reduced half: 2Cu2+ + 2e- → 2Cu1+
Oxidized half: 2I-1 → 2I0 + 2e-
Suppose 30g of nickel (II) bromide is dissolved in of an aqueous solution of 50 mL of 1.6M potassium carbonate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the nickel (II) bromide is dissolved in it.
5.48 M of bromide anions.
A 2.50 g sample of an unknown gas occupies 1.50 L at 25°C and 760 mmHg. What is the molar mass of the gas?
40.8 g/mol
31 :0
AND WE STILL NEED MORE FOR NEXT SEMESTER, SO APPLYYYYY
2 Na + Cl₂ → 2 NaCl
If you start with 10 grams of sodium and 15 grams of chlorine gas, what is the theoretical yield of sodium chloride?
If you actually produce 18 grams of sodium chloride, what is the percent yield?
Theorical amount: 24.67 grams of sodium chloride.
Percent yield: 73.03%
A 25.00 mL sample of a hydrochloric acid solution is titrated with 0.100 M sodium hydroxide. The equivalence point is reached after 22.35 mL of the sodium hydroxide solution is added. Calculate the molarity of the hydrochloric acid solution.
0.0894 M of hydrochloric acid
What is the concentration needed for AgCl to completely react with 50mL of 4.6M KClO4.
Not really possible, because one of the reactants, AgCl, is a solid and it does not react with the KClO4.
A 23.8L ballon is filled with 88g of CO2 at 15oC, what is the pressure in kPa?
258.9 kPa
Of what color is the white house?
White :0000