Question 3 Describe the production of X-rays by a rotating anode tube. Explain the advantages of using a rotating anode compared to a fixed anode.

QUESTION 9 Explain why an Ether (as shown below) has a low boiling but a ketone (propanone) as shown below) has a high boiling point. H;C CH3 H;C CH3 O A. Ether forms weak dispersion forces with itself while Ketone forms strong hydrogen bonds with itself O B. Ether forms weak dispersion forces with itself while Ketone forms strong dipole-dipole interaction with itself OC Ether forms weak dipole-dipole interaction with itself while Ketone forms strong hydrogen bonds with itself O D. Ether forms weak hydrogen bonds with itself while Ketone forms strong dispersion forces with itself. O E. Ether does not form any bonds with itself since there are no H atoms while ketone forms strong hydrogen bonds with itself.

Question 4 All of the following are true about eyes EXCEPT Each cone cell attaches to one connecting neuron, thus giving the brain fine detail O Cones allow us to see color O light hits cones directly without other cells in the way but rods are blocked by other cells we have the most cones at the very back of the eye in the fovea region Question 5 1 The rods and cones in our eyes have special proteins embedded in their membranes which hold light- reacting molecular units. In rods the unit is called which is a modified form of Vitamin A. O carotene O codeine O carnassial O retinal

Light emitting diodes work by creating an electrical circuit where electrons fall across a “band gap" (i.e. they go from a high energy state to a low energy state). The larger the gap, the more energy they emit when they fall. This energy is emitted as a photon (i.e. a particle of light). The color of light generated by the LED is directly related to the size of the band gap. A large energy change results in blue light and small energy changes results in red light. Because LEDS made of pure elements can only emit light that is too high or too low in energy for us to see, mixtures of elements must be used to create a band gap that results in visible light. The table below summarizes the composition and properties of three different elemental combinations used in LEDS. Table 1: Composition and Properties of LEDS Element 1 Element 2 Size of Band Gap LED Color Gallium Nitrogen Large Blue Gallium Phosphorous Medium Green Gallium Arsenic Small Red

QUESTION 9 For microprojectile bombardment, the particles used are typically? a. Nickel O b. Tungsten c. Magnesium d. Copper

Question 5. What is typically the purpose of using a transmission electron microscope to image a sample? A. To obtain greater magnification. B. To obtain greater resolution. C. To obtain greater resolution and magnification. D. To observe organelles. E. None of these answers is correct.

In a reverse phase chromatography set up, the component that yields the lowest Rf value is likely to be O Both polarity O Polar O Non-polar O Cannot be determined

QUESTION 5 Regarding the Gram stain procedure: whether Gram-positive or Gram-negative, cells may appear colorless... O A. prior to application of the primary stain OB. prior to application of the counterstain O C. following application of the mordant O D. A. B, and C are all true O E. Only A and B are true O F. Only B and C are true

Question 2 You are checking a calculation that a foundation pharmacy student has performed. The question asks that 120 suppositories weighing 1 gram are to be made, containing 300mg Zinc Oxide. The displacement value of ZnO is 4.7 in the base that is to be used. How many grams of base would be required?  units - g Answer to 2 decimal places Amount of base required = theoretical amount – displaced amount   Where; Displaced amount = (amount of drug in g/DV of drug).

QUESTION 33 1 p Which of the following is the correct order of wavelengths of the visible light spectrum starting with the color with the longest wavelength? O Orange, yellow, green, red, blue, indigo and violet Red, orange, yellow, green, blue, indigo and violet Violet, indigo, blue, green, yellow, orange and red Red, yellow, orange, blue, green, indigo and violet Red, indigo, violet, blue, green, orange and yellow QUESTION 34 Which of the following parts of the spectrophotometer converts light energy into electrical energy? O Photometric system Light source Monochromator Phototube Sample holder