I, the student taking this test, understand that if I do not rip apart the scratch papers  as stated above I will lose four points on this test.  

What are some of the mechanistic differences between central sensitization and temporal summation (Windup)?

A graph is shown of the pressure of dinitrogen pentoxide, N2O5,  in a reaction vessel during a certain chemical reaction. Match the terms to the best estimate of the correct value.  Not all numbers will be used.  Hint:  count squares to estimate values.

At 40°C, the vapor pressure of ethylene glycol is 120. Torr.  If  {U} moles of urea is mixed with {EG} moles of ethylene glycol, what will the new vapor pressure be for this mixture at 40°C?  Hint:  If your answer is smaller than 50, you have an error. Do not include the units in your answer.

What is the freezing point of a solution that contains {g} g of glycerin (molar mass= 92.09 g/mol) in 100. g of H2O?  Kf for water is 1.86°C/m.  Enter only the numerical part of your answer in °C, not the units.

Determine the mass of water in kg if [a] ×104 calories are absorbed to increase the temperature of water from [b]°C to [c]°C. Use q = m × SH × ΔT, SH of water = 4.184 J/(g•°C) and 1 J = 0.239 cal). Make sure to report your final answer with 3 SFs.__________ kg.You must include your math work (scanned copy of scratch papers) for credit. 

Heat of fusion of water is 333 J/g. How many pounds (lb) of ice were melted if [a] kJ of energy was absorbed during the melting process? (Hint: Check units!)

A piece of paper has the area of [a] × 10–3 m2. This area is equivalent to __________squared inches (in2)? (1 in = 2.54 cm)__________ in2. Enter the final answer with 3 SFs. Do not enter units.

How many significant figures (sig. figs.) are in the following measurements? (A) 2.5000 km = [BLANK-1] sig. figs. (B) 0.0020 s = [BLANK-2] sig. figs. (C) 5200 mi = [BLANK-3] sig. figs. (D) 2002 L = [BLANK-4] sig. figs. (E) 0.05 g = [BLANK-5] sig. figs.

Describe the clinical features and location as seen in this photo. Identify the disease or condition. Include the cause and any other related symptoms or features as applicable. Lastly, as a hygienist: describe your conversation with this patient regarding their condition.