Naming/Writing Formulas
Provide the correct names for the following compounds: (a) ClO2 (b) SF6 (c) Cl2O7
(a) Chlorine dioxide (b) Sulfur hexafluoride (c) Dichlorine heptoxide
What is the molecular formula for a compound with an empirical formula of C2OH4 and a molar mass of 88g/mol?
C402H8
What is the difference between oxidation and reduction?
Oxidation occurs when electrons are lost and reduction occurs when electrons are gained. Remember "LEO goes GER"
Lose
Electrons
Oxidized
Gain
Electrons
Reduced
Calculate the volume of 0.500 M NaCl needed to prepare 200 mL of a 0.150 M NaCl solution.
60mL
Classify the following as soluble or insoluble in water: (a) Cobalt(II) Hydroxide (b) Barium Nitrate (c) Ammonium Phosphate
(a) Insoluble
(b) Soluble
(c) Soluble
What is the formula for Lead (II) sulfite?
PbSO3
What are the empirical and molecular formulas for a compound with 86.88% carbon and 13.12% hydrogen and a molecular weight of about 345g/mol
Empirical - C5H9
Molecular - C25H45
What is the oxidation state of Nitrogen in N2O4?
+4
What is the molarity of a solution that contains 10.0 grams of Silver Nitrate (AgNO3) that has been dissolved in 750 mL of water?
0.0785M AgNO3
Determine the limiting reactant in the following chemical equation if 1.20mol Al react with 2.40mol I2:
2Al + 3I2 --> 2AlI3
Al
What is the correct molecular formula for the compound, tin(IV) chloride pentahydrate?
SnCl4•5H2O
Caffeine has the following percent composition: carbon 49.48%, hydrogen 5.19%, oxygen 16.48% and nitrogen 28.85%. Its molecular weight is 194.19 g/mol. What is its molecular formula?
C8H10N4O2
Determine the oxidation number of each element in Zn(OH)42-
Zn: +2
H: +1
O: -2
H3PO4 + 3NaOH --> Na3PO4 + 3H2O
What volume (in mL) of 0.20 M H3PO4 is needed to react with 100mL of 0.10 M NaOH according to the above reaction?
17mL H3PO4
Consider the unbalanced reaction:
Al + HBr → AlBr3 + H2
When 3.22 moles of Al reacts with 4.96 moles of HBr, how many grams of H2 are formed?
5.01g H2
Name or write the proper formula for these acids (must get each part correct to receive credit): (a) HNO3 (b) Carbonic Acid (c) H2S
(a) Nitric acid (b) HCO3 (c) Hydrosulfuric acid
95.6 mg of menthol (molar mass = 156 g/mol) are burned in oxygen gas to give 269 mg CO2 and 110 mg H2O. What is menthol's empirical formula?
C10H20O
Identify the species being oxidized and reduced in each of the following reactions:
Rxn 1: 3Hg2+ + 2Fe(s) --> 3Hg2 + 2Fe3+
Rxn 2: 2As(s) + 3Cl2(g) --> 2AsCl3
Rxn 1: Hg2+ reduced, Fe oxidized
Rxn 2: As oxidized, Cl2 reduced
CaCO3 + 2HCl --> CaCl2 + H2O + CO2
According to the above equation, how much 0.80 M HCl would be needed to dissolve a CaCO3 pearl which weighs 4.0 grams?
0.10L HCl
Consider the reaction of C6H6 + Br2 --> C6H5Br + HBr
a. What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0g of Br2?
b. If the actual yield of C6H5Br is 63.6 g, what is the percent yield?
c. What are the limiting and excess reactants?
a) 71.7g C6H5Br
b) 88.7%
c) Limiting Reactant - Br2; Excess Reactant - C6H6
What is the correct molecular formula for the compound, lead(II) perchlorate trihydrate?
Pb(ClO4)2•3H2O
Quinone, which is used in the dye industry and in photography, is an organic compound containing only C, H, and O. What is the empirical formula of the compound if you find that 0.105 g of the compound gives 0.257 g of CO2 and 0.0350 g of H2O when burned completely? Given a molecular weight of approximately 108 g/mol, what is its molecular formula?
C6H4O2
Determine the oxidizing agent and reducing agent in the following chemical equation: Cd(s) + NiO2(s) + 2H2O(l) --> Cd(OH)2(s) + Ni(OH)2(s)
Oxidizing Agent - NiO2
Reducing Agent - Cd
A titration was performed based on the following equation:
H2C2O4 (aq) + KOH (aq) → K2C2O4 (aq) + H2O (l)
In this titration, 44.55 mL of KOH was added to neutralize 15.00 mL of 0.0800 M H2C2O4. What was the concentration (in M) of KOH in the sample?
0.0539 M KOH
For the following reactants, provide both the molecular and net ionic equations:
K3PO4(aq) + Al(NO3)3(aq) -->
Molecular: K3PO4(aq) + Al(NO3)3(aq) --> AlPO4(s) + 3KNO3(aq)
Net Ionic: Al3+(aq) + PO43-(aq) --> AlPO4(s)