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A skydiver having a mass of 100 kilogram experiences air resistance of 500 N and an acceleration of about
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Calculate the hydromium ion concentration and the ph of a solution in which the concentration of NaH2PO4 is 0.10 M and the concentration of Na2HPO4 is 0.15 M. The Ka for H2PO4- is 6.2 x 10 to the negative 8.
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The ff. reaction of potassium superoxide (KO2) is used in life support systems to replace CO2 in expired air with O2. 4KO2 + 2 CO2 ---> 2 K2CO3 + 3 O2 The human body expels about 1kg of carbon dioxide in 24hrs. What mass of KO2 is required to provide life support for 1 day?
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What mass of ethanol, C2H5OH a nonelectrolyte, must be added to 10.0L of water to give a solution that freezes at -10C? Assume the density of water is 1.0g/ml. Kf of water is 1.86c/m?
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How many grams of h2(g) are produced by the reaction of 1.84g Al with 75mL of 2.95M HCL
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what are the ksp values of benzoic acid at 20 and 30 degrees celsius?
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Assuming 116 g of butane burns completely in oxygen, what is the theoretical yield of water in grams? 2C4H10 + 13O2 8CO2 +10H2O
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at constant pressure a gas at -23degree celcius is heated to 127degree celcius.calculate the percentage increase in the volume of the gas. [60%]
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How many milliliters of 1.34 M NaOH are needed to prepare 25.0 mL of 0.185 M NaOH?
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what we can discuss on the determination of the concentration of acetic acid in vinegar
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Sample Questions
- 1. For organic chemistry, what is a concerted shift? How do things like acids or heat affect them? What other factors affect them?
- 2. Which of the following reactions is an acid-base neutralization reaction? Why are the rest of the answers incorrect?
- A. AgNo3 (aq) + NaI (aq) --> AgI (s) + NaNO3 (aq)
- B. S8(s) + 8O2 (g) --> 8SO2(g)
- C. Na3PO4 (s) + 2H2O (l) --> H2 (g) + 2NaOH (aq)
- D. Ca (OH)2 (aq) + 2HI (aq) --> CaI2(aq) + 2H2O (l)
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