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Since iron is more reactive than copper, it displaces the copper ions from the aqueous solution of copper sulphate. This is called a single displacement reaction of one metal by another metal. To experimentally test this, Joel reacted 0.9845 g of iron fillings with an excess of copper sulphate solution. When the reaction was complete the solution had changed from blue to green and a copper deposit weighing 1.024 g had formed in the solution. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2+) is converted into metallic copper.
a) Calculate the number of moles of iron used and the number of moles of copper formed.
b) Calculate the theoretical mass of copper that was expected to be produced and hence determine the percentage yield of Joel’s experiment.
How many molecules of iron are present in 0.9845 g of iron fillings?
Question:
The organic compound below is abbreviated Tris and is basic. The conjugate acid (TrisITT has a pKa of 8.10.
TrisH+ + H20 = Tris + H30 +
Tris is commonly used as a component in buffer solutions to study biochemical reactions.
a) A buffer solution is prepared by mixing 12.5 mL of 0.100 mol L- 1 HCl with 25.0 mL of0.100 mol L- 1 Tris. What is the pH of this buffer? Write all the equations used and explain your steps.
b) The buffer was used to study an enzyme-catalyzed reaction in which 0.00020 mol of H30+ was produced. What is the pH of the solution after the acid reacted with the buffer? Write all the equations used and explain your steps.
You are to write a program that will allow the user to select from a menu of 3 movies available to watch. The menu should look like the following:
- Movie 1: Venom: Let There be Carnage
- Movie 2: Halloween Kills
- Movie 3: Vivo
If the user asks to watch Movie 1, ask for the number of tickets to buy and print the total to pay. The price per ticket for Movie 1 is $8.
If the user asks to watch Movie 2, then the program must ask for his/her age before it proceeds. If the user is younger than 18 years old, the program must print a message saying "Sorry you must be 18 or older to watch this movie." If the user is 18 or older, then proceed to ask how many tickets the user wants and print the total to pay. Price per ticket for Movie 2 is $10.
If the user asks to watch Movie 3, ask for the number of tickets to buy and print the total to pay. The price per ticket for Movie 3 is $6.50.
Write the balanced NET IONIC equation for the reaction that occurs when hydrochloric acid and potassium hypochlorite are combined.
Use H3O+ instead of H+.
This reaction is classified as:
A. Strong Acid + Strong Base
B. Weak Acid + Strong Base
C. Strong Acid + Weak Base
D. Weak Acid + Weak Base
The extent of this reaction is:
.
A. ... Below 50%
B. ... 50%
C. ... Above 50%
D. ... 100%
Jose has 19 new magazines to read. Let M be the number of magazines he would have left to read after reading of them. Write an equation M relating R to . Then use this equation to find the number of magazines he would have left to read after reading 11 of them
Statistics students believe that the mean score on the first statistics test is 65. A
statistics instructor thinks the mean score is higher than 65. He samples ten statistics
students and obtains the scores 65 65 70 67 66 63 63 68 72 71. The data are assumed
to be from a normal distribution.
Construct a 90% confidence interval for the mean scores
On what part of the sarcolemma would you expect to find acetylcholine receptors?
According to a certain country's department of education, 44.1% of 3-year-olds are enrolled in day care. What is the probability that a randomly selected 3-year-old is enrolled in day care?
ABC uses job-order costing. It applies overhead cost to jobs on the basis of direct
labor-hours. The following transactions took place during the year:
A. $300,000 of raw materials were purchased on account
B. Raw materials were issued into production: $90,000 direct materials and
$40,000 indirect materials
C. Labor costs incurred: $40,000 direct, $130,000 indirect, sales commissions
$50,000, administrative salaries $100,000
D. Utility costs for the factory were $60,000
E. Depreciation recorded was $300,000 (70% related to factory; 30% related
to administrative offices)
F. Manufacturing overhead of $715,000 was applied to production. Actual
direct labor-hours incurred were 22,000.
G. Units costing $300,000 were completed and transferred into the finished
goods inventory.
H. Goods with a cost of $150,000 were sold on account for $200,000.
I. Closed the under/overapplied overhead for the year
Suppose the marginal utility and total utility of Peter's weekly consumption of bananas are both positive and that he subsequently consumes fewer bananas per week.What will happen to his marginal utility and total utility of apples?
#339914 on Dec 2023