Chemical reaction of copper and percent yield
Hydrogen gas. Reaction  proceeds to completion because zinc has a lower ionization energy or oxidation potential that copper.
The bottom of the evaporating dish was dried with a towel. What kind of reaction is this? The evaporating dish and copper were weighed and the mass was recorded.
When zinc (or aluminum) was allowed to react with the copper sulfate, what was the limiting reagent?
We assumed we had excess in all cases and removed the excess by washing. Prepare a steam bath as illustrated and dry the product on your steam bath for at least 5 minutes. Reaction Observations 3. This experiment is designed as a quantitative evaluation of your individual laboratory skills in carrying out some of these operations. The evaporating dish and copper were weighed and the mass was recorded. How do you know 14? Therefore you will have 2. The copper precipitate was uniform in appearance. Give criteria in terms of temperature changes for exothermic and endothermic reactions. Weight of copper final 5. The methanol was decanted. The precipitate in the beaker was allowed to settle. Create your own data table for quantitative data. All must be written in complete sentences.
Suppose 8. How do you know 14? Weight of evaporating dish 4.
Chemical reactions of copper and percent yield chegg
Weight of copper final 5. A red-brown gas NO2 was produced. Your choices are: decomposition reaction, oxidation-reduction reaction, acid-base reaction, combustion reaction, single displacement reaction, double displacement reaction and synthesis reaction. When no more of it remains, no additional product can be made and the reaction stops. For each of the five reactions, identify the reaction type s. Write a balanced equation for the reaction. This is equivalent to 2. At the same time you will become more acquainted with two fundamental types of chemical reactions -- redox reactions and metathesis double-displacement reactions. When decanting, lost some sample by pouring it out. Reaction  proceeds to completion because zinc has a lower ionization energy or oxidation potential that copper. Define percent yield in general terms.
The precipitate was allowed to settle. By washing method, we cannot remove the entire amount of the NaNo3 particles from the CuO particles because of improper dissolution.
Which of the following best describes the reaction of cu(s)+hno3(aq)>?
What are you removing by washing and decanting 9? Weight of copper final 5. When no more of it remains, no additional product can be made and the reaction stops. The water was decanted. It is difficult to remove all of the precipitate from the beaker using simply liquid. What are you removing by washing 15? The original copper sample contained a specific number of moles of copper, and that amount of copper was present in every reaction, precipitate, and solution. What is the gas? The unwanted precipitate will not participate in subsequent reactions, causing a constant unwanted mass in addition to the desired mass of reaction products. How many milliliters of 6. When gas evolution has ceased, decant the solution and transfer the precipitate to a preweighed porcelain evaporating dish 3. The reaction was allowed to occur in the fume hood. Some precipitate is always lost when supernatant liquid is separated from the precipitate. What are you removing by washing 15? Write a balanced equation for this reaction.
The quantitative measure of success in this experiment is percent yield, which is the ratio of recovered mass to initial mass. What are you removing by washing 15?
Some methods of separation, such as filtration, sedimentation, decantation, extraction, and sublimation were discussed earlier.
If your percent yield of copper was greater
Decantation - pour off solvent leaving behind precipitate Filtration - pass through filter that separates our components of a mixture by differences in particle size 9. Aluminum is oxidized: Al 0 Al e - Copper is reduced: Cu e - Cu 0 It could also be called a single replacement reaction where aluminum is chemically more active than copper. When sulfuric acid and copper II oxide are allowed to react, copper II sulfate and water are formed. What is meant by the term limiting reagent? CuSO4 copper II sulfate Suggest possible sources of error in this experiment. Small bits of excess aluminum may be present giving the silver color of aluminum mixed in with copper sample. How do you know? How would this error affect your percent yield of Cu? Show ALL calculations. The boiling chips were removed from the copper.
There are several ramifications of this experiment. Entire compound was not removed by the washing due to incomplete dissolution.
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