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Which one of the following statements is True? If heat is given off by a system then the heat has a negative sign If work is done on a system then the work has a negative sign Work, heat and temperature all have units of joules The 1st law of thermodynamics is represented by the equation: change in E=q
laser beam to read the digital video data off a DVD disk. What is the frequency of this red colored visible light?
A solution is 0.40 mol % (C6H6) in carbon tetrachloride (CCl4) at 20 degree celcius. the vapor pressure of pure benzene at this temperature is 74.61 mmHg and the vapor pressure of pure carbon tetrachloride is 91.32 mmHg
The lethal doses (expressed in ppm by volume) of two gases A & B are the same and equal to 20 ppm. Indicate how many mg of each gas would be needed to reach the lethal concentration in a room of 46m^3.
A 2.00-g sample of a large biomolecule was dissolved in 19.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule.
The pH of .750 M sodium hypochlorite, NaClO, is 10.72. What is the pKb for this base
A zero-order reaction has a constant rate of 1.00×10-4 . If after 80.0 seconds the concentration has dropped to 6.50×10-2 , what was the initial concentration.
From the ln [reactant] as a function of temperature you can tell the reaction rate is first order if it is a linear curve ln[A]t = -kt + ln[A]o How is this equation derived
How many grams of P2O5 gas are present in a 750 ml container that is at 75 degrees C and at a pressure of 590 mm Hg?
The ionization energy of hydrogen is reported to be 1.31x10^6 J mol^-1 of H. (1) compute the ionization energy for a single atom of hydrogen.
a rectangular block of plastic, measuring 1.50 cm by 2.29 cm by 1.84 cm, floats in the middle of the Pacific Ocean. The volume of sea water displaced by the plastic block is 5.46 cm3. Assuming the density of the sea water is 1.025 g/mL, what is th..
methyl amine (CH3NH2 Kb= 3.6x10^-4) with 25.0 mL OF 0.10 M benzoic acid (C6H5COOH Ka = 6.3x10^-5), will the resulting solution be acidic, basic, or neutral?
A buffer solution contains 0.20M CH3CO2H and 0.34M NaCH3CO2. If 8.00 ml of 1.00 M HCl is added to 100.00 mL of this buffer solution. In what direction and by how much will the pH change?
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