Chemical Reactions
What type of reaction is represented by the equation (2 KClO3 --> 2 KCl + 3 O2
What is Decomposition
How many moles of H₂O can be produced from 3.5 moles of O₂ in the reaction (4 NH₃ + 5 O₂ --> 6 H₂O + 4 NO)?
What is 4.2 moles H2O
3.5 moles O₂ x (6 moles H2O / 5 moles O2) = 4.2 moles H₂O
What is the molarity of a solution made by dissolving 25.0 g of NaCl in 500.0 mL of water?
NaCl: 58.44 g/mol
What is 0.86 M
Grams -> moles = 0.43 mol
mL -> L = 0.5 L
mol/L = 0.43/0.5 = 0.86 M
What is the pH of a 0.005 M HCl solution?
-log(0.005)
A solution has a pH of 5.2
What is weak acid
Balance the equation: ___ Na + ___ Cl₂ → ___ NaCl.
What is 2,1,2
How many grams of NH₃ are required to produce 8.5 moles of H₂O?
(4 NH₃ + 5 O₂ --> 6 H₂O + 4 NO)?
What is 96.5 g NH3
8.5 moles H2O x (4 moles NH3 / 6 moles H2O) x (17.03 g NH3 / 1 mol NH3) = 96.5 g NH3
How many grams of KOH are needed to prepare 2.0 L of a 0.75 M solution?
What is 84.16 g KOH
mol = L x M
2.0 L x 0.75 M = 1.5 mol
mol -> grams = 84.16 g KOH
What is the hydroxide concentration of an NaOH solution whose pOH is 11.6?
What is 2.51x10-12 M
10-11.6
What are the 5 types of chemical reactions?
Synthesis
Decomposition
Single
Double
Combustion
What is the molar mass of NH₃
What is 17.03 g/mol
H (3 x 1.008) = 3.024
N (1 x 14.007) = 14.007
3.024 + 14.007 = 17.03 g/mol
How many grams of O₂ are needed to react with 68.0 g of NH₃ in the reaction (4 NH₃ + 5 O₂ --> 6 H₂O + 4 NO)?
What is 159.72 g O2
68.0 g NH3 x (1 mol NH3 / 17.03 g NH3) x (5 mol O2 / 4 mol NH3) x ( 32 g O2 / 1 mol O2)
If you dilute 1 L of a 0.50 M CuSO₄ solution to 2.0 L, what will the new molarity be?
What is 0.25 M
M1V1 = M2V2
(1 x 0.5)/ 2 = 0.25 M
If 50 mL of an unknown concentration acid is titrated with a 1.0 M NaOH solution and requires 53 mL of NaOH, what is the concentration of the acid?
What is 1.06 M
(53 x 1) / 50
In a titration, 25 mL of an unknown acid requires 50 mL of 1.0 M NaOH to reach the equivalence point. What is the concentration of the acid?
What is 2 M
(50 x 1) / 25
What is avogadro's number?
What is 6.02x1023 particles
Calculate the percent yield if Na reacts to produce 175.0 g of NaCl with a theoretical yield of 190.0 g.
What is 92.11%
(Actual / Theoretical) x 100%
(175 / 190) x 100%
Calculate how much 6.0 M HCl is needed to prepare 500.0 mL of 1.5 M HCl
What is 125 mL
(500 x 1.5) / 6
If 25 mL of an unknown concentration acid requires 50 mL of 0.5 M NaOH for titration, what is the concentration of the acid?
What is 1 M
(50 x 0.5) / 25
In a balanced equation, what does the coefficient represent?
a. The atomic number
b. The number of moles
c. The atomic mass
d. The oxidation number
What is The number of moles
How many molecules are present in 4.5 moles of H₂O?
What is 2.71x1024 molecules
4.5 moles x (6.02x1023 molecules)
Identify the limiting reactant in the reaction (2 Al + 3 Cl₂ --> 2 AlCl₃) if starting with 10.0 g of Al and 25.0 g of Cl₂.
AL: 26.982 g/mol
Cl2: 70.9 g/mol
AlCl3: 133.33 g/mol
What is Cl2
Grams Al --> Moles Al --> Moles AlCl3 --> Grams AlCl3 = 49.4 g AlCl3
Grams Cl2 --> Moles Cl2 --> Moles AlCl3 --> Grams AlCl3 = 31.3 grams AlCl3
What happens to the molarity if you add more NaCl to a 1.0 M NaCl solution without changing the volume?
What is the molarity increases
Explain the difference between the endpoint and the equivalence point in a titration.
What is The equivalence point is when moles of acid equal moles of base, while the endpoint is when the indicator changes color
What happens to the molarity of a solution if you remove half of the solvent without removing any solute?
A. It stays the same
B. It doubles
C. It halves
D. It quarters
What is it doubles