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1) If the level of water in the eudiometer is above that in the cylinder, is the pressure in the eudiometer higher or lower than the atmospheric pressure?
2) Why do we put the magnesium in a copper basket? (why not some other metal?)
3) What are possible sources of error?
4) For each of the following experimental or calculations errors, tell of the calculated value of R, writte if would be too high, too low or unchanged.EXPLAIN
a) Some air bubbles were introduced when the eudiometer was inverted.
b) The magnesium was coated with magnesium oxide.
c) Some of the hydrogen gas is dissolved in the water (hint: if it is dissolved, it wont be a bubble!)
need to dissolve CaCl2 in water to make a mixture that is 31.0% calcium chloride by mass. If the total mass of the mixture is 405.5 g, what masses of CaCl2 and water should be used?
If the ethane is burning at the rate of 0.20 mol/L.s, at what rate are CO2, and H2O being produced?
A student is presented with a sample of an unknown substance and asked to classify the substance as organic or inorganic
A .647 L sample of hydrogen chloride (HCl) gas at 1.12 atm and 23°C is completely dissolved in 885 mL of water to form hydrochloric acid solution. Calculate the pH of the solution.
choose from among the following: disulfide bond, salt bridge, hydrogen bonding or dispersion forces. A) glutamic acid and lysine B) tyrosine and lysine C) Ile and Ala D) two cysteines
What volume of 0.2500 M cobalt(III) sulfate is required to react completely with a) 25.00 mL of 0.0315 M calcium hydroxide?
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Draw lewis structures of all the important resonance forms of HCO2-. Indicate the values of nonzero formal charges
What is the gas pressure (in atm) inside a 1.89-L bulb that contains 1.56-g of Ne at a temperature of 21.1 C? Be sure to report the units as atm
Assign absolute configurations to the chiral carbons n one of your Fischer projections. Indicate which of the compounds you have drawn would be optically active. Explain your reasoning.
A 280- mL flask contains pure helium at a pressure of 757 torr. A second flask with a volume of 465 mL contains pure argon at a pressure of 715 torr.
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