Solutions
Ochem
Student Requests
Redox
Miscellaneous
100
How many moles of CaCO3 are there in a 3.05g sample?
What is 0.0305mol?
100
Name this compound.
What is propyne?
100
A hydrocarbon chain has 18 carbons and is an alkyne.
What is H34 hydrocarbon chain? (C18H34)
100
Balance the following half-reaction:
Cl2 --> 2Cl-
What is Cl2 + 2e- --> 2Cl-
100
State if the reaction between tin solution and a piece of cadmium is spontaneous or non-spontaneous.
What is a spontaneous reaction?
200
A hair product requires you to combine 20.0mL of hydrogen peroxide with enough water to produce a solution with a total volume of 120.0mL. Determine the percent by volume concentration of the solution.
What is 16.7%?
200
Draw 2,5-dimethyl-3-hexyne in a line diagram.
200
Identify what is being oxidized and what is being reduced in the following equation:
Cl2 (g) + 2NaBr(aq) → 2NaCl(aq)+ Br2 (g)
Oxidized: Br- (aq)
Reduced: Cl2 (g)
200
Identify the oxidizing agent and reducing agent in this reaction.
AgNO3 + Cu --> Cu(NO3)2 + Ag
Oxidizing agent: Ag+(aq)
Reducing agent: Cu(s)
200
This process takes crude oil and heats it up to separate out the hydrocarbons by size.
What is fractional distillation?
300
In a chemical analysis of 500mL of carbonated water, 0.36g of carbon dioxide was measured. What is the concentration of carbon dioxide in parts per million?
What is 720ppm?
300
Draw 4-ethyl-2,3-dimethylheptane.
300
Molar Concentration (Hint* 2 step)
You dissolve 39.0g of calcium carbonate (CaCO3) into 750ml of water.
What is 0.520 mol/L
Molar Mass: 100.09g/mol
n =0.38965 mol
C = 0.51953 mol/L
300
State if the reaction between Hg(l) and Chromium solution is spontaneous or non-spontaneous.
What is a non-spontaneous reaction?
300
You are conducting an experiment that requires salt water. You dissolve 0.435 mol of NaCl in 200mL of water. What is the concentration?
What is 2.18mol/L?
400
If 5.00 mol/L NaClO3(aq) is used to make 50.0 mL of a 3.75 mol/L solution, find the volume of the original solution.
What is 37.5mL?
400
Balance the combustion reaction for 1-butene. How many moles of CO2 are produced per mole of 1-butene?
C4H8 + 6O2 --> 4CO2 + 4H2O
400
Standard Solutions:
25.0ml of a standard 1.75mol/L solution of hydrochloric acid is diluted to 200ml. What is the new concentration? (Hint* CiVi=CfVf)
What is 2.19x10-1 mol/L?
400
Label the reactions occurring at each electrode in this plating apparatus. (Pt is Platinum and it forms a 2+ ion)
Pt electrode: Pt(s) --> Pt2+(aq) + 2e-
Iron key: Pt2+(aq) + 2e- --> Pt(s)
400
This is the number of protons, neutrons, and electrons in Li+
What are 3 protons, 4 neutrons, and 3 electrons?
500
How many liters of 4 M solution can be made using 100 grams of lithium bromide?
What is 0.3L.
500
This process takes longer/larger hydrocarbon compounds and breaks them into multiple smaller compounds.
What is cracking?
500
Methane burning in a water heater is shown by the following equation:
CH4(g) + 2O2(g) → CO2(g) + 2 H2O(g)
If 1.275 moles of methane are burned, then the number of moles of H2O produced is:
Moles of H2O: 2.55
500
Identify the reduction and oxidation half-reactions in the following cell:
Reduction: Ag+(aq) + e- --> Ag(s)
Oxidation: Mg(s) + 2e- --> Mg2+(aq)
500
Draw the Bohr and Lewis diagrams for Mg.
