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What are the differences among race, nationality, and ethnicity? What does it mean to say that race is socially constructed? Explain with specific examples in paragraph form.
Calculate the pH during the titration of 100.0 mL of 0.200 M HCl with 0.400 M NaOH. First what is the initial pH What is the pH after 38.5 mL of NaOH are added
a solution is prepared by dissolving 4.21g of a nonelectrolyte in 50.0 g of water. if the boiling point increases by
The concentrationof the alkane C20H42 (FM= 282.55) in a particular sample in rain water is 0.2ppb. assume that the density of the rain water is close to 1.00 g/ml and find the molar concentration of C20H42.
(a) 0.519 M acetic acid (weak acid with Ka = 1.8e-05). (b) 0.802 M hydrocyanic acid (HCN) (weak acid with Ka = 4.9e-10). (c) 0.693 M pyridine (weak base with Kb = 1.7e-09).
How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling point, if its Hvap is 31.6 kJ/mol
how many grams of water can be cooled from 45circ rm c to 20circ rm c by the evaporation of 65 rm g of water? the heat
Finding Number of Atoms in a Molecule from Molecular Weight, As determined from the gas law, the molecular weight of a substance is eight times the atomic weight
At what pH must solutions of nickel (II) ions be maintained in order to prevent precipitation of the hydroxide
at constant volume, the initial pressure of a substance is 0.63 atm and the initial temperature is 283 k.calculate the pressure of the substance at 295 k.
Write the formulas of all possible monobromination products when cyclopentane is exposed to Br2 in presence of light, rection occurs.
a 265- flask contains pure helium at a pressure of 757 . a second flask with a volume of 485 contains pure argon at a
For a particular redox reaction MnO2 is oxidized to MnO4- and Ag is reduced to Ag. Complete and balance the equation for this reaction in basic solution
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