The writer is very fast, professional and responded to the review request fast also. Thank you.
Book/movie review
22/08/2022
Question 4: Balancing Redox Equations (4.5 points)
a. The following reaction takes place in an acidic solution.
MnO4–(aq) + Cl–(aq) Mn2+ + Cl2(g) (unbalanced)
i. Write the reduction and oxidation half-reactions (without electrons). (.5 point)
•
ii. Balance the equations for atoms (except O and H). (.5 point)
iii. Balance the equations for atoms O and H using H2O and H+. (.5 point)
iv. Balance the charge in the half-reactions. (.5 point)
v. Multiply each half-reaction by the proper number to balance charges in the reaction. (.5 point)
vi. Add the equations and simplify to get a balanced equation. (.5 point)
b. Assume a reaction takes place in a basic solution to form the given products:
MnO4–(aq) + Cl–(aq) MnO2(s) + Cl2(g) (unbalanced)
i. Balance the given half-reactions for atoms and charge. (.5 point)
MnO4– + H2O MnO2 + OH–
Cl– Cl2
ii. Multiply to balance the charges in the reaction. (.5 point)
iii. Add the equations and simplify to get a balanced equation. (.5 point)
Question 5: Galvanic Cell (3 points)
a. Give an example of a galvanic cell. What kind of reaction occurs in a galvanic cell? (1 point)
b. If one electrode in a galvanic cell is made of zinc (Zn) and one is made of silver (Ag), which metal would be the cathode and which would be the anode? Explain your answer. (1 point)
c. Write the standard cell notation for a galvanic cell with a silver cathode and a zinc anode. (1 point)
Question 6: Electrolytic Cell (3 points)
a. What kind of reaction occurs in an electrolytic cell? What characterizes its voltage? (1 point)
b. What makes an electrolytic cell work? Name two applications of electrolytic cells. (1 point)
c. If a piece of jewelry were electroplated with gold for 25 seconds at 1.5 A, how many grams of gold would be plated?
(Note: 1 A = 6.241 1018 e–/s. The reaction for the reduction of gold ions to gold metal is Au+ + 1e– Au(s).) (1 point)
Question 7: Stoichiometry (3 points)
a. How is stoichiometry used to calculate amounts of substances in a chemical reaction? (1 point)
b. Use the balanced equation to answer the following questions. (2 points)
CuSO4(aq) + 2NaOH(aq) Cu(OH)2(s) + Na2SO4(aq)
i. What is the ratio of moles of CuSO4 to moles of NaOH? (.5 point)
ii. If 638.44 g CuSO4 reacts with 240.0 NaOH, which is the limiting reagent? (.5 point)
iii. Use the limiting reagent to determine how many grams of Cu(OH)2 should precipitate out in the reaction. (.5 point)
iv. If only 174.6 g of Cu(OH)2 precipitate were actually collected from the reaction, what would the percent yield be? (.5 point)
Question 8: Scientific Themes (3 points)
a. What does matter have to do with chemistry? How are forces involved? (.5 point)
b. How do chemists use systems and order in their work? (.5 point)
c. How do atoms demonstrate unity and diversity at the same time? (.5 point)
d. How are models used in chemistry? How does evidence change these models? (.5 point)
e. How do structure and function affect how molecules work? (.5 point)
f. How are both stability and change seen in properties of elements? (.5 point)
The writer is very fast, professional and responded to the review request fast also. Thank you.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.
Read moreEach paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.
Read moreThanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.
Read moreYour email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.
Read moreBy sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.
Read more