A 2.335 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 5.030 grams of CO2 and 2.060 grams of H2O are produced. In a separate experiment, the molar mass is found to be 102.1 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

Enter the elements in the order C, H, O

empirical formula =

molecular formula =

Glutamate synthetase is central to nitrate assimilation. You, as a grad student, are curious about how other nutrients might regulate this enzyme; and specifically, you would like to study how the gene encoding this enzyme is regulated by the presences of phosphate in the environment. Describe the design of your experiment(s) that will look at the regulation of the glutamate synthetase gene by phosphate. Remember to include controls in your description.

Describe the experiment by Hofman, Van Riswick, and Van Opsal (1998). What is an HRTF, i.e., how is it measured? Describe the changes in performance that occur with experience listening with ear molds. How do the data of Hoffman, van Riswick, and van Opsal demonstrate an individual can possess multiple simultaneous pinna transform functions (that relate pinna filtering to elevation)?

*No article was provided to me.

A researcher wants to investigate the impact of providing pain killers to rickshaw drivers (n=350) in India on their alcohol consumption. In an RCT experiment, she runs this model where Pain_Killer is 1 if given free pain killers or 0 otherwise and Alcohol_Cons_i is amount of daily alcohol consimption for each rickshaw driver.

Alcohol_Cons_i = B₀ + B₁Pain-Killer+u_i

_{Is there anything "Wrong" with this equation?}

Some may argue that the findings of the Solomon Asch experiment are not terribly valuable because conformity is being assessed on a relatively innocuous task (i.e., choosing line sizes). What kind of situation might you use to test conformity that would be immune to this criticism? Can you think of a way to test conformity in the real world in a way that would be both useful and ethical?

• Give one example (not listed in the textbook) for each scale of measurement (nominal, ordinal, interval, ratio).
• Come up with a relationship that you think exists between 2 variables. How would you study that using a correlation study?
• How would you study the relationship from b. using an experiment? Make sure to identify the independent and dependent variables in your study.

In a physics lab experiment, a compressed spring launches a 36 g metal ball at a 35 ∘ angle. Compressing the spring 20 cm causes the ball to hit the floor 2.0 m below the point at which it leaves the spring after traveling 5.9 m horizontally. Part A What is the spring constant? Express your answer to two significant figures and include the appropriate units.

1. What is the molarity of a 12.6% solution of sodium carbonate with a density of 1.31 g/mL?

2. What is the mass percent of potassium iodide in a 2.89 M solution of KI with a density of 1.27 g/mL?

3. In an experiment similar to your 15.72 mL of a 0.1294 M Ba(OH)2 solution is titrated with 20.00 mL of a HNO3 solution. What is the molarityof the HNO3?

3. You are hard at work, setting up the apparatus to separate a 40:60 mixture of diethyl ether and toluene by simple distillation. Just as you are getting ready to begin the experiment, your lab partner mistakenly adds a small amount of sodium sulfate into the distillation flask. Would simple distillation still be appropriate or should you switch to fractional distillation? Explain.