Four chemical reactions occurred. All of the reactants are solutions

HCl + NaOH (25 mL of both) 2 molar for both                  -56480 J/mole

HCl + NaOH (50 mL of both) 2 molar for both                 -292900 J/mole

CH₃COOH + NaOH (25 mL of both) 2 molar for both          -56480 J/mole

CH₃COOH + NH₄OH (25 mL of both) 2 molar for both -49380 J/mole

1.       Write the net ionic equation for each of the reactions studied.

2.       Use the table of heats of formation in your textbook to calculate the standard value for the first and second experiments

3.       For the first experiment, determine your experimental error and the percentage error for this experiment.

4.       Within experimental error, how did dilution in the second experiment effect the heat of reaction per mole of water produced? Should the two values be the same or different?

5.       Were the heats of reaction per mole or reactants different for the strong acid/strong base, weak acid/strong base, weak acid/weak base reactions? Which had the highest heat of reaction? Which had the lowest? What conclusions can you make from these values? Why might the values be different from each other?

Some of the standard enthalpy values do not appear in the textbook guide. How do I find the value for the compounds if they are not in the correct state in the book.

1- The indicator is the solution that is slowly added to the sample during a titration.

True

False

2-At the first equivalence point in this experiment the number of moles of HCl added to the sample and the number of moles of PO ₄^3-originally in the sample are

3-At the equivalence point Blank 1 PO ₄^3- remains and there is Blank 2 H ₃ O ⁺ leftover. The number of moles of H ₃ O ⁺ added to the sample is Blank 3 to the number of moles of PO ₄^3- with which you started.

4- After the first equivalence point, further addition of HCl will cause the reaction to form what ion?

5-The titrant in this experiment, HCl, is a base.

True

False

6-

The sample in this experiment, phosphate, is an acid.

True

False

7-The titrant will be poured into which piece of equipment?

Pendulum experiment:

1) create a plot of length (x axis) versus average period (y axis). Make sure to clearly label your axes and indicate units.

(2) create a plot of length (x axis) versus (average period)2 (y axis). Add a linear trend line. Record the slope of the best fit line.

(3) recall that the period of an ideal simple pendulum is given by the following relation: T= 2pi sq rt of L/g

squaring both sides of the equation gives us this relation: T^2=4pi^2L/g= 4pi^2/g*L. Using the slope of your T2 versus L plot determine the acceleration due to gravity.

(4) how close is your experimentally determined gravitational acceleration to 9.81m/s^2? What are potential sources for error in this experiment?

(5) for small angles does the pendulums period of oscillation depend in the initial angular displacement from equilibrium? Explain.

(6) why is it a good idea to use a relatively heavy mass in this experiment? What would you say to a colleague that wanted to use only one washer as the pendulum mass?

(7) use the relation of the period of an ideal simple pendulum. = 2pi square rt of L/g to calculate the ratio of the periods of identical pendulums on the earth and on mars. Note the gravitational acceleration on the surface of mars is approx 3.7 m/s^2.

6.) In the 1952 Hershey-Chase experiment showed that DNA is the genetic material of bacteriophage. Explain where the protein labeled with 35S ended up and where the DNA labeled with 32P ended up after centrifugation in their experiment. a. Draw a diagram of the experiment in support of your explanation. b. Is it possible to do the reverse labeling? (protein labeled with 32P and DNA is labeled with 35S) Why or why not?

7.) For each base-pair set, state if the two pairs are distinguishable using the minor groove, the major groove, or both. a. G:C vs. C:G ________ b. A:T vs. G:C _________

c. A:T vs. T:A _________

8.) Ethidum bromide (EtBr) is a large flat, multiringed cation. Its flat shape allows it to insert itself between the stacked base pairs of double stranded (dsDNA). Because it fluoresces when exposed to UV light and because its fluorescence increases dramatically after intercalation, it is used as a stain to visualize DNA. When ethidium intercalates it causes the DNA to unwind by about 26 degrees, reducing the normal rotation per base pair, decreasing the twist (T) of the DNA.

a. What effect would this change have on the writhe (W) of the plasmid?

b. When EtBr is used to visualize a relaxed covalently closed circular plasmid by gel electrophoresis, what effect would this have on the migration of the plasmid?

Let the difference be defined as Before – After.

NEED TO BE IN PYTHON!!!

Make sure to put the main section of your code in the following if block:

# Type code for classes here

if __name__ == "__main__":

# Type main section of code here

(1) Build the Account class with the following specifications:

Attributes

• name (str)
• account_number (int)
• balance (float)

Create a constructor that has 3 parameters (in addition to self) that will be passed in from the user. (no default values)

Define a __str__() method to print an Account like the following

Account Name: Trish Duce

Account Number: 90453889

Account Balance: $100.00

Define a deposit() method that has 1 parameter (in addition to self) that will be passed in from the user. (no default values) The method deposits the specified amount in the account.

Define a withdraw() method that has 2 parameters (in addition to self) that will be passed in from the user. (no default values) The method withdraws the specified amount (1st parameter) and fee (2nd parameter) from the account.

(2) In the main section of your code, create 3 accounts.

• Trish Duce 90453889 100
• Donald Duck 83504837 100
• Joe Smith 74773321 100

(3) Print the 3 accounts using print(acct1)…

(4) Deposit 25.85, 75.50 and 50 into accounts 1, 2 and 3.

(5) Print the 3 accounts.

(6) Withdraw 25.85 (2.50 fee), 75.50 (1.50 fee), 50.00 (2.00 fee).

(7) Print the 3 accounts.

Output should look like the following:

Account Name: Trish Duce

Account Number: 90453889

Account Balance: $100.00

Account Name: Donald Duck

Account Number: 83504837

Account Balance: $100.00

Account Name: Joe Smith

Account Number: 74773321

Account Balance: $100.00

Account Name: Trish Duce

Account Number: 90453889

Account Balance: $125.85

Account Name: Donald Duck

Account Number: 83504837

Account Balance: $175.50

Account Name: Joe Smith

Account Number: 74773321

Account Balance: $150.00

Account Name: Trish Duce

Account Number: 90453889

Account Balance: $97.50

Account Name: Donald Duck

Account Number: 83504837

Account Balance: $98.50

Account Name: Joe Smith

Account Number: 74773321

Account Balance: $98.00

Name or describe 3 ways that the supply and demand graphs for labor is similar to the supply and demand graphs for a product. Then name or describe 3 significant ways they are different.

1. Explain the function of the thyroid, name three hormones it produces, and explain one disorder of the thyroid.

2. Name and describe 4 types of sensory receptors

Tell me about a brand whose name is descriptive of the product and/or its benefits. Even if it's obvious, explain how the name is descriptive of the product/benefits.