a chem 1515 student does the same experiment as the one you will be conducting this week but at a different temperature. She mixes 5.00 mL of 1.00 x 10-3 M solution of Fe(NO3)3 with 5.00 mL of 1.00 x 10-3 M KSCN solution. She finds out the equilibrium concentration of FeSCN2+ at theis condition to be 2.5 x 10-5 M. What is the value of the equilibrium constant for the reaction? Fe3+ (aq) + SCN- (aq) <--> FeSCN2+ (aq)

An experiment was conducted to investigate the effect of extrusion pressure (P) and temperature at extrusion (T) on the strength y of a new type of plastic. Two plastic specimens were prepared for each of five combinations of pressure and temperature. The specimens were then tested in a random order and the breaking strength for each specimen was recorded. The independent variables were coded (transformed) as follows to simplify the calculations: x₁= (P-200)/10, x₂= (T-400)/25. The n=10 data points are listed in the table:

                y                     X₁                  X₂

              5.2                  -2                  2

                5                  -2                  2

              0.3                  -1                 -1

            -0.1                  -1                 -1

            -1.2                   0                  -2

            -1.1                   0                  -2

              2.2                  1                  -1

2                   1                  -1

6.2________2 ________2

              6.1                  2                   2

!                                                               

1. Find the least-squares regression equation of the form y = β₀ + β₁x₁ + β₂x₂ + ε (you may use a calculator or any software that can perform operations with matrices).
2. Does the model contribute information for the prediction of y? Test using α=0.10.
3. Suppose that we are interested in an interval estimate for the strength of plastic for the following combination of pressure and temperature: x₁=1 and x₂=1. Would a confidence interval or a prediction interval be more appropriate in this situation? Calculate this interval using α=0.01.

An experiment was conducted to see the effectiveness of two antidotes to three different doses of a toxin. The antidote was given to a different sample of participants five minutes after the toxin. Thirty minutes later the response was measured as the concentration in the blood. What can the researchers conclude with an α of 0.01?

a) What is the appropriate test statistic?
---Select--- na one-way ANOVA within-subjects ANOVA two-way ANOVA

b) Obtain/compute the appropriate values to make a decision about H₀.
Antidote: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

Dose: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0

Interaction: critical value =  ; test statistic =
Decision:  ---Select--- Reject H0 Fail to reject H0


c) Compute the corresponding effect size(s) and indicate magnitude(s).
Antidote: η² =  ;  ---Select--- na trivial effect small effect medium effect large effect
Dose: η² =  ;  ---Select--- na trivial effect small effect medium effect large effect
Interaction: η² =  ;  ---Select--- na trivial effect small effect medium effect large effect


d) Make an interpretation based on the results.

There is an antidote difference in blood concentration.

There is no antidote difference in blood concentration.    

There is a dose difference in blood concentration.

There is no dose different in blood concentration.    

There is an antidote by dose interaction in blood concentration.

There is no antidote by dose interaction in blood concentration.    

An experiment examined the impact of THC (the active ingredient in marijuana) on various physiological and psychological variables. The study recruited a sample of 18 young adults who were habitual marijuana smokers. Subjects came to the lab 3 times, each time smoking a different marijuana cigarette: one with 3.9% THC, one with 1.8% THC, and one with no THC (a placebo). The order of the conditions was randomized in a double-blind design.At the start of each session, no subject reported being “high.” After smoking the cigarette, participants rated how “high” they felt, using a positive continuous scale (0 representing not at all “high”). For the placebo condition, participants reported a mean “high” feeling of 11.3, with a standard deviation of 15.5. Is there evidence of a significant placebo effect, with subject feeling significantly “high” after smoking a placebo marijuana cigarette?

**********************PLEASE SHOW WORK!!!!*******************************

What is the appropriate statistic to test this hypothesis? What is its value?

What is the P-value for the appropriate test? Specify the distribution used and all relevant parameters.

An experiment was planned to compare the mean time (in days) required to recover from a common cold for persons given a daily dose of 4 milligrams (mg) of vitamin C, μ₂, versus those who were not, μ₁. Suppose that 32 adults were randomly selected for each treatment category and that the mean recovery times and standard deviations for the two groups were as follows.

Conduct the statistical test of the null hypothesis in part (a) and state your conclusion. Test using

α = 0.05.

(Round your answer to two decimal places.)

Find the test statistic.

z =

Find the rejection region. (Round your answers to two decimal places. If the test is one-tailed, enter NONE for the unused region.)

z > z <

Experiment 2: Using the Secondary Standard to Determine the Concentration of an Acid

1. In an Erlenmeyer flask, add 25 mL of Unknown #1 concentration of acetic acid (CH₃COOH) and 2 drops of phenolphthalein indicator.

2. Coarse Titration:

(a) Take a burette from the Containers shelf and place it on the workbench. Fill the burette with 50 mL of the standardized sodium hydroxide solution. Record the initial burette reading. Place the Erlenmeyer flaskon the lower half of the burette.

(b) Perform a coarse titration, adding large increments of the sodium hydroxide solution from the buretteby pressing and holding the black knob at the bottom of the burette. Each time you add the sodium hydroxide solution, check the volume remaining in the burette. As the sodium hydroxide is added to the acetic acid solution the pH increases. Watch for a change of the phenolphthalein color in the Erlenmeyer flask. The pink color will appear in Erlenmeyer flask when the endpoint is either reached or crossed. Record the burette volume at which this occurs.

(c) Place the Erlenmeyer flask and the burette in the recycling bin.

3. Fine Titration:

(a) Set up the tiration as before: (i) An Erlenmeyer flask filled with 25 mL of unknown #1 concentration of acetic acid and 2 drops of phenolphthalein indicator. (ii) A burette filled with 50 mL of the standardizedsodium hydroxide solution. Record the initial burette reading. (iii) Place the Erlenmeyer flask on the lower half of the burette.

(b) Click and hold the black knob of the burette to quickly add enough standard sodium hydroxide solution to just get into the range of the coarse titration: 1 mL BEFORE the pink endpoint. This is near, but not yet at, the titration's endpoint.

(c) Add sodium hydroxide solution in small increments, down to one drop at a time, record the volume of the pink endpoint.

(d) Place the Erlenmeyer flask and the burette in the recycling bin.

4. Repeat the titration two more times for a total of three trials. Use 30mL of acetic acid for trial 2 and 35mL for trial 3. Calculate the acid concentration of each trial.
[If you run out of NaOH, simply prepare a second solution as described in step 2 of Exp. 1. You don’t need to standardize it a second time. Assume the standardized concentration is the same as before.]

In the space below, show your calculation(s) for approximating the molarity of a 200.0 mL solution containing 0.8 g NaOH so molarity of NaOH is 0.10mol/L?

Need help with the B, C, D, E, F, G and the calculation part

Trial 1              Trial 2              Trial 3

a) Volume of acid (mL)                                     25.1mL             30.1mL            35.1mL

b) Volume of NaOH titrated (mL)                     _____              _____              _____

c) Moles of NaOH titrated                                 _____              _____              _____

d) Moles of acid                                               _____              _____              _____

e) Concentration of acid (M)                             _____              _____              _____

f) Average acid concentration (M)                                             _____

Using your Trial 1 data, show you work for calculating each of the following:

Moles of NaOH titrated

Moles of acid

Concentration of acid

In an experiment in extrasensory perception (ESP), a subject in one room is asked to state the color (red or blue) of a card chosen from a deck of 50 well-shuffled cards by an individual in another room. It is unknown to the subject how many red or blue cards are in the deck.

a.)

What are your null and alternate hypotheses in this case?

b.)

If the subject identifies 32 cards correctly, determine the chances of each hypothesis being correct. Use the Gaussian approximation to the binomial distribution in making your calculations. Are these results are significant at either the 5% and 1% levels?

In an experiment, a solution sulfuric acid is mixed with an excess of sodium carbonate. One of the products is a gas. This gas is collected in a one-liter flask at 20.0°C. What will be the pressure in the flask if 113 mL of the sulfuric acid solution is used? The [H2SO4] can be found from its complete titration (25.0 mL H2SO4) with 16.0 mL of NaOH (NaOH : standardized with 58.7 mL of a 1.000 M HCl)

To test whether memory changes with age, a researcher conducts an experiment in which there are four groups of six subjects each. The four groups are listed below. All subjects are in good health and matched in other important variables such as years of education, IQ, gender and motivation. Each subject is shown a series of nonsense syllables (a meaningless combination of three letters such as DAF or FUM) at a rate of one syllable every 4 seconds. The series is shown twice after which the subjects are asked to write down as many of the syllables as they can remember. The number of syllables remembered by each subject is shown below.

Please use SPSS to compute the test statistic for the following problems. For those questions, please turn in the appropriate SPSS output.

1. Perform the appropriate analysis
2. Wherever appropriate, calculate and report effect size(s)
3. Make a decision regarding the null hypothesis and write an APA-style conclusion interpreting your statistical results with regard to the aims of the experiment and as you would write it up in a report, including the statistical evidence to back it up.