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For the reaction:
Zn + Cu(NO3)2 → Zn(NO3)2 + Cu
Explain, in terms of electrons, why it is a redox reaction. You must use half equations in
your answer.
6. DDT, an insecticide harmful to fish, birds and humans is produced by the following reaction
2C6H5CL + C2HOCL3 ———–> C14H9Cl5 + H2O
Chlorobenzene Chloral DDT
In a government lab, 1142 g of chlorobenzene is reacted with 485 g of chloral. (a) What mass of DDT is formed, assuming 100% yield
(b) Which reactant is limiting and in excess? Justify your answer.
(c) What mass of excess reactant is left over
(d) If the actual yield of DDT is 200 g, what is the percentage yield
1. An experiment requires a solution that is 80% methyl alcohol by volume. What volume of methyl alcohol should be added to 200 mL of water to make this solution?
A student determines the molar mass of acetone, CH3COCH3, by the method used in this experiment. He found that the equilibrium temperature of a mixture of ice and water was 1.2oC on his thermometer. When he added 12.2 g of her sample to the mixture, the temperature, after thorough stirring, fell to –3.0oC. He then poured off the solution through a screen into a beaker. The mass of the solution was 100.5 g. How much water was in his decanted solution?
A student determines the molar mass of acetone, CH3COCH3, by the method used in this experiment. He found that the equilibrium temperature of a mixture of ice and water was 1.2oC on his thermometer. When he added 12.2 g of her sample to the mixture, the temperature, after thorough stirring, fell to –3.0oC. He then poured off the solution through a screen into a beaker. The mass of the solution was 100.5 g. What did he find to be the molar mass of acetone; assuming he made the calculation properly?
A student determines the molar mass of acetone, CH3COCH3, by the method used in this experiment. He found that the equilibrium temperature of a mixture of ice and water was 1.2oC on his thermometer. When he added 12.2 g of her sample to the mixture, the temperature, after thorough stirring, fell to –3.0oC. He then poured off the solution through a screen into a beaker. The mass of the solution was 100.5 g. What was the molality of the acetone? (Hint: kf = 1.86 for water)
What is R?
What is R group?
Explain any abbreviation you use.
You need to define the abbreviations used? What does R stands for?
If molarity of Na2CO3 is 0.05 M at a volume of 25.00 cm3 while the titre value of HCl is 14.00 cm3, calculate the concentration of HCl in mol/dm3. Equation of the reaction is Na2CO3(aq) + 2HCl(aq) →2NaCl(aq) + H2O(l) + CO2(g) Na = 23, Cl = 35.5, C = 12, O = 16, H = 1
Calculate the heat produced when 6.50x10^3g of sulfur trioxide gas combines with water to produce sulfuric acid.
You are running a solvent extraction to isolate the products of a synthesis, using an aqueous layer and an organic layer. After agitation and settling, the two layers are of very similar appearance. You know that the organic layer contains your product and the aqueous layer is the waste layer, but you are not 100% certain which layer is which. What simple test might you perform to determine which is the organic layer?
