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Which of the following systems communicates with instructions form the CNS (central nervous system) with signals responsible for controlling our visceral organs (i.e. heart, glands, piloerector muscle, etc.); causing involuntary, subconscious actions.

Extension of the elbow is an example of which of the following?

An infant’s fetal iron storage begins to diminish at _____ months:

List the 4 stages of Growth Pattern 

(WCSP24) Define the following terms: a.  Accuracy – b. Precision – c.  Physical change- d.  Solubility – e.  Specific heat –

(WCSP24) In the spectroscope experiment, you studied the interaction of visible light with matter.  Select the type of particles involved in transitions when visible light interacts with matter.

Copper was mixed with nitric acid (HNO3). Fizzing and bubbling occurred along with a color change from colorless to blue. The gaseous product was collected in a test tube and exposed to a glowing splint.  A loud pop was heard.  (WCSP24) Identify the gas produced and indicate what observation would correspond to a different gas by making the following matches.

18.  (WCSP[x], 6 points) A student experimentally observed three (3) emission lines from a hydrogen tube in her spectroscope. One of these was a red line that was determined to have a wavelength of 664 nm. She thinks that this is due to an electron undergoing a transition from the third to the second orbit. a.  Assume that the Bohr model is correct and calculate the wavelength predicted for the n=3 to n=2 transition.  (Equations and constants are listed above.)   Enter the value in the box below.   

(WCSP24) Using the data below, answer the following questions by entering a single letter (a-e) in the box: a.  Which measurement is the most precise?  [blank1] b.  Which measurement has the fewest significant figures? [blank2]   Measurement ± Uncertainty (mL) a 10.5 ± 0.5 b 10. ± 1 c 1.00 ± 0.02 d 500 ± 100 e 250.0 ± 0.1

7.  A chromatography experiment was used to determine components in a mixture. a.  Calculate the Rf values for spot A and spot B using your ruler. Show your work. Use appropriate significant figures in your measurements and calculations.  (6 points, WCSP24.[x])    b. The stationary phase for the previous chromatogram was cellulose, which is highly polar due to the presence of multiple hydroxyl (OH) groups.  The mobile phase was water.  Given this, identify which amino acid (a building block for proteins) shown below corresponds to A and B.  Explain your reasoning. (6 points)   Enter the Rf value of spot A in the box below.