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.

Pre-Lab Questions

1. Describe at least two factors that can affect the rate of a chemical reaction.
2. Describe the chemical reaction occurring in a glowstick. What type of reaction is it? How do you know a chemical reaction is occurring? What is the role of the dye?
3. Using the “If ___, then ___” format, write a hypothesis to predict what will occur to a glow stick if you change its temperature.
4. The decomposition of H₂O₂ is a first-order reaction given by the formula: Rate = k [H₂O₂]¹. How would the reaction rate be affected if the H₂O₂ concentration were double its original value?

experiment 1: temperature and the rate of chemical reaction

Data Sheet

Table 1. Temperature vs. Brightness of Glow Stick

Graph of Your Data:

Post-Lab Questions

1. Was your hypothesis supported or rejected? Use your data to support your reasoning.
2. What was the independent variable in the experiment?
3. What was the dependent variable in the experiment?
4. What are some human errors that could have affected your results?
5. What is the correlation between the brightness of the glow stick and the reaction rate?
6. How does the temperature surrounding the glow stick affect the observed brightness? Use your data to support your answer.

I'm stuck on this homework and don't know where to start!

A student is trying to determine the rate law for a reaction involving 2 reactants, A, B and C using the Method of Initial Rates. The following initial rate data were obtained at 25 degrees C. (Note: the overall stoichiometry of the reaction is: A + B + 2C -> 3 D)

Experiment______Initial [A]______Initial [B]______Initial [C]_______Initial Rate of Reaction

1______________ 0.1 M_________ 0.1 M_________ 0.2 M _________4x10^-4 M/min

2_______________ 0.3 M ________0.2 M _________0.2 M __________1.2x10^-3 M/min

3 ______________0.1 M_________ 0.3 M _________0.2 M ___________4x10^-4 M/min

4______________ 0.3 M_________ 0,4 M _________0.6 M __________3.6x106-3 M/min

a) Write the rate law expression for the reaction

b) What is a plausible rate-determining step in the mechanism of this reaction?

c) What is the numerical value of k, the rate constant for this reaction?

d) In Experiment 1, what would the rate of the reaction be when exactly 1/2 of the A present initially has been consumed?

e) In Experiment 2, what is the maximum concentration obtainable for D? (Assume that the volume remains constant)

f) In Experiment 4, when the reaction has proceeded to completion, which reactant or reactants if any, and in what concentration, remain unconsumed?

Calcium and Blood Pressure Does increasing the amount of calcium in our diet reduce blood pressure? Examination of a large sample of people revealed a relationship between calcium intake and blood pressure. The relationship was strongest for black men. Such observational studies do not establish causation. Researchers therefore designed a randomized comparative experiment. The subjects were 12 healthy black men who volunteered to take part in the experiment. They were randomly assigned to two groups: 10 of the men received a calcium supplement for 12 weeks, while the control group of 11 men received a placebo pill that looked identical. The experiment was double-blind. The response variable is the decrease in systolic (top number) blood pressure for subject after 12 weeks, in millimeters of mercury.

An increase appears as a negative response here are the data:

Group 1 (calcium): 7 -4 18 17 -3 -5 1 10 11 -2

Group 2 (placebo); -1 12 -1 -3 3 -5 5 2 -11 -1 -3

Do the data provide sufficient evidence to conclude that a calcium supplement reduces blood pressure more than a placebo?

Carry out an appropriate test to support your answer.

??:

 ??:

Find the value for Test Statistic. 

Test Static =  

p-value =  

Step 4:   Circle one:    Reject  ?? or Fail to Reject  ??  

Conclusion in context: 

Calcium and Blood Pressure Does increasing the amount of calcium in our diet reduce blood pressure? Examination of a large sample of people revealed a relationship between calcium intake and blood pressure. The relationship was strongest for black men. Such observational studies do not establish causation. Researchers therefore designed a randomized comparative experiment. The subjects were 12 healthy black men who volunteered to take part in the experiment. They were randomly assigned to two groups: 10 of the men received a calcium supplement for 12 weeks, while the control group of 11 men received a placebo pill that looked identical. The experiment was double-blind. The response variable is the decrease in systolic (top number) blood pressure for subject after 12 weeks, in millimeters of mercury.

An increase appears as a negative response here are the data:

Group 1 (calcium): 7 -4 18 17 -3 -5 1 10 11 -2

Group 2 (placebo); -1 12 -1 -3 3 -5 5 2 -11 -1 -3

Do the data provide sufficient evidence to conclude that a calcium supplement reduces blood pressure more than a placebo?

Carry out an appropriate test to support your answer.

??:

 ??:

Find the value for Test Statistic. 

Test Static =  

p-value =  

Step 4:   Circle one:    Reject  ?? or Fail to Reject  ??  

Conclusion in context: 

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?