1)A 55.67 g sample of a substance is initially at 22.7 °C. After absorbing 2847 J of heat, the temperature of the substance is 132.2 °C. What is the specific heat (c) of the substance?

2)An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 7785 J. What is the specific heat of the gas?

3)How much work must be done on a system to decrease its volume from 13.0 L to 5.0 L by exerting a constant pressure of 4.0 atm?

4)If a system has 5.00 × 102 kcal of work done to it, and releases 5.00 × 102 kJ of heat into its surroundings, what is the change in internal energy of the system?

Find the pH of the following solutions: a mixture of 10.0 mL NaOH solution having pH 11.00 and 10.0 mL HClO4 having pH 1.00.

2.) Using activities calcalute the pH and concentration of H+ in pure water containing 0.05 M CaCl2 at 25 degrees C

The following data were obtained for the concentration vs. time for a certain chemical reaction. Values were measured at 1.0 s intervals, beginning at 0.00 and ending at 20.0 s. Concentrations in mM are:
10.00, 6.91, 4.98, 4.32, 3.55, 3.21, 2.61

2.50, 2.22, 1.91, 1.80, 1.65, 1.52, 1.36
1.42, 1.23, 1.20, 1.13, 1.09, 1.00, 0.92
a) Plot concentration, c, vs. time, t, ln c vs. t, and 1/c vs. t.
b) Decide whether the data best fit zero-order, first-order or second-order kinetics and calculate the rate constant (with units (!!!)).

Describe three types of charge transfer transitions that are possible in theromocromatic complexes

Complete this table of values for four aqueous solutions at 25

Let's use 32 as the number of ATP produced per glucose's aerobic catabolism. (See the last sentence in the legend to Table 21.1 for the rationale for this number.)

Now, what would the ATP yield be, in aerobic catabolism, for the processing of dihydroxyacetone phosphate?

Experiment 1: Gravimetric Analysis with Calcium Chloride and Potassium Carbonate
In this experiment, proper analytical experimental techniques will be utilized to perform a double displacement reaction. A solution will be prepared containing a known quantity of calcium chloride. Then, the mass of calcium present will be determined through a careful precipitation of calcium carbonate. You will also investigate the hygroscopic nature of calcium chloride through a comparison reaction.
Materials:
Scale250 mL Beaker50 mL BeakerStir rod4.0 g Calcium chloride, CaCl25.0 g Potassium carbonate, K2CO3100 mL Graduated CylinderPipetteRing for ring standRing stand

Funnel250 mL Erlenmeyer flask2 Filter papersWatch glassWeigh boat*170 mL Distilled water*10 mL Isopropyl alcohol
*You must provide



Procedure
Place the weigh boat on the scale and determine its mass.
Add approximately 2.0 g of CaC to the weigh boat (the total mass should be     the mass of the weigh boat plus 2.0 g). Set this sample aside, and let it sit exposed to the air (but otherwise undisturbed) for 24 hours. Complete Steps 3 - 20 while you wait..
Place a 250 mL beaker on the scale. Tare the scale and leave the beaker on the scale..
Add approximately 2.0 g. of CaCl2 to the beaker. Record the exact mass of the powder in Table 1.
Remove the beaker from the scale. Use a pipette to add 50 mL of distilled water to the beaker and mix with the stir rod until all CaCl2 has dissolved.
             Note: This is an exothermic process, so the beaker may become warm.
Place a 50 mL beaker on the scale. Tare the scale and leave the beaker on the scale.
Add 2.5 g of K2CO3. Record the exact mass of the powder in Table 1.
Remove the beaker from the scale. Use a pipette to add 25 mL of distilled water   to the 50 mL beaker and mix with the stir rod until all K2CO3 has dissolved.
Add all of the K2CO3 solution to the beaker containing the CaCl2 solution. It is important that all of the K2CO3 is added. To ensure this, rinse the 50 mL beaker with up to 5 mL distilled water, and pour the rinse in the CaCl2 solution.
Stir the solution for approximately four minutes. Then, allow it to sit for 15 minutes. This gives sufficient time for all CaCO3 to precipitate.
While the solution is sitting, set up the filtration apparatus. Begin with an iron ring and a ring stand. Secure the ring to the stand. Be sure to select the ring size that most appropriately holds the funnel.
Place a funnel in the ring, and place a 250 mL Erlenmeyer flask below the ring, such that the bottom of the funnel is also inside the mouth of the flask.
Obtain a piece of filter paper. Use the scale to weigh the filter paper and record the mass in Table 1.
Obtain a watch glass. Use the scale to weigh the watch glass and record the mass in Table 1.
Fold the filter paper in half and in half again, so that it resembles a triangle with one arced side.
Pull apart one fold of the filter paper so that three sides of the filter paper remain together, with one side making up the other half of the funnel shape.
Place the paper into the funnel and seat with a small amount of distilled water (this will prevent the filter paper from rising up).
Filter the solution from the beaker (that you created in Step 9) slowly. Additional distilled water may also be used to transfer any remaining solid into the filtration apparatus.


After all the solution has been filtered, use the pipette to rinse the filter paper with approximately 5 mL of isopropyl alcohol to aid the drying process. Allow the isopropyl alcohol to completely drip through the filter before removing filter paper from the funnel.
Carefully remove the filter paper, unfold and place it precipitate-side up onto the pre-weighed watch glass. Be sure not to lose any product during this transfer.
Repeat Steps 3 - 20 for the CaCl2 that was allowed to sit exposed to air for 24 hours.
Allow the products from both trials to dry, undisturbed, for at least 24 hours and determine the mass of the product recovered by re-weighing the system and subtracting the weight of the filter paper and watch glass. Record your data in Table 1.

Table 1: Data and Observations
Substance
Trial 1
Trial 2
Mass of CaCl2:
 
 
Mass of K2CO3:
 
 
Mass of Filter Paper


Mass of Watch Glass


Mass of Product


Amount of Time Beaker Solution Stirred:


Amount of Time Beaker Solution Set:


Experimental Observations:







Calculations

First Trial

Theoretical yield (CaCO3):

Actual yield (CaCO3):

Percent yield:

Moles of Ca present in original solution, based on actual yield:

Mass of CaCl2 present in original solution, based on actual yield:
Second Trial

Theoretical yield (CaCO3):

Actual yield (CaCO3):

Percent yield:

Moles of Ca present in original solution, based on actual yield:

Mass of CaCl2 present in original solution, based on actual yield

Which ions are paramagnetic and which ions are diamagnetic. Please explain why each ion is either paramagnetic or diamagnetic.

Dark Blue: 9,10-Diphenylanthracene
Light Blue: Perylene
Green: 9,10-Bis(phenylethynyl)anthracene
Yellow: Rubrene
Orange: Rhodamine 6G

The fluorophore suspensions used listed above, I need to know which dye should work the best, glow the brightest? I know that conjugation of the molecule affects which color will be reflected, Is there a dye on this list that doesn't work as well as the others and why?

What comments can you make regarding person's potential for good “long-term” health as it related to diet related diseases?

Calculate amount of energy obtained PER WEIGHT (not per molecule) of glucose vs. palmitic acid. Show your calculations and the units. Compare the two numbers and briefly discuss their significance

ionization energy is usually expressed in units of kj/ mole 1000 j = 1 Kj

use the bohr equation to calculate the ionization energy of hydrogen in K j/ mole ? show your work

lowering the pH of the solution inside the battery will: a. make E larger than E b. make E smaller than E c. have no effect on E vs. E d. make the battery last longer

Crime scene investigators have determined that an acrylic spray paint (polymethylmethacrylate, PMMA) was used to deface the Mona Lisa. Leonardo used linseed oil. We would like a solvent that interacts more strongly with acrylic than with linseed oil. Based on their chemical structures, we can approximate the SSCED parameters of linseed oil as n-hexadecane and acrylic paint as methylethylketone. Do you recommend CHCl_3, toluene, or acetone as the solvent? Explain.