1. Calculate the change in total internal energy for a system that releases 2.38 × 10⁴ kJ of heat and does 6.80 × 10⁴ kJ of work on the surroundings. Enter your answer in scientific notation.

2. In a gas expansion, 69 J of heat is absorbed by the system, and the energy of the system decreases by 114 J.

Calculate the work done.

3. Be sure to answer all parts. Given the thermochemical equation for photosynthesis, 6H₂O(l) + 6CO₂(g) →C₆H₁₂O₆(s) + 6O₂(g) . ΔH = +2803 kJ/mol. Calculate the solar energy required to produce 8503 g of C₆H₁₂O₆.

4. In a constant-pressure calorimetry experiment, a reaction gives off 23.8 kJ of heat. The calorimeter contains 150 g of water, initially at 25.4 c. What is the final temperature of the water? The heat capacity of the calorimeter is negligibly small.

5. A piece of silver with a mass 4.10 ×10² g has a heat capacity of 97.2 J/° C. What is the specific heat of silver?

The density of a gaseous compound is 2.06 g/L at STP. What is the most likely formula of this gas?

Ionization engergy of Na: 496 kj/mol

Electron Affinity of F: 328 kJ/mol

Energy to vaporize Na: 108 kJ/mol

F2 bond energy: 160 kJ/mol

Energy Change for the reaction:

Na (s) + 1/2F2 (g) = NaF (s) ; DeltaH = -575K

Photons are the force carriers and source of electromagnetic interactions between electrons and protons. How are electromagnetic interactions described by wave mechanics? (i.e. Schrodinger's equation, the Hamiltonian operator, the Born probability density function, etc).

list the steps for balancing a nuclear reaction

what is the handbook value of concentration of calcium carbonate in hot water

How is SDS-PAGE technique different from cellulose acetate electrophoresis?

explain how the cathode rays may be obtained

A typical person has an average heart rate of 68.0 beats/min. Calculate the given questions. How many beats does she have in 4.0 years? How many beats in 4.00 years? And finally, how many beats in 4.000 years? Pay close attention to significant figures in this question.

4.0 years:_____beats

4.00 years:_____beats

4.000 years:_____beats

A new wastewater treatment plant was built to treat the wastewater flow 800,000 gpd. The capital cost to build the wastewater treatment plant was $6,000,000. The annual operation and maintenance costs of operating the plant is $700,000/year. Estimate the cost of treating 1000 gallons of wastewater ($/1000 gallon). Assume the design life as 20 years and interest rate of 4%.

A digital watch battery draws 0.40 milliamperes of current, which is provided by a mercury battery whose net reaction is: HgO(s) + Zn(s) → ZnO(s) + Hg(l) If a partially used battery contains 1.80 g of each of these four substances, for how many hours will the watch continue to run?

Calculate the ionic strength in a solution that contains 0.010 mol KCl, 0.005 mol MgCl2, 0.002 mol MgSO4, and 100g H2O.

Describe a low carbohydrate diet and a low fat diet. Be sure to describe them at the molecular level and relate them to the pathways we’ve studies in this class. Compare and contrast these two with a severe caloric deficit diet (i.e. starvation). Which of the two diets most closely resembles starvation in terms of metabolic pathways.