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Problem- A sample of rainwater is observed to have a pH of 7.4. If only atmospheric CO2 at 380 ppm and limestone dust are present in the atmosphere to alter the pH from a neutral value, and if each raindrop has a volume of 0.02 cm^3, what mass of calcium is present in each raindrop?
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which of the following alcohols undergoes dehydration at the fastest rate on being heated with H2SO4? a) 1-butanol b)2-methyl-1-butanol c)2-methyl-2-butanol d)3-methyl-1-butanol e)3-methyl-2-butanol?
137Cs decays by beta minus emission to an isomeric state in 137Ba which then decays by the emission of a gamma-ray. If we start with a 4 mCi of pure 137Cs, define what will be the activity of 137mBa after five minutes. The half-lives of 137Cs as well..
When 2.45g of an unknown weak acid (HA) with a molar mass of 85.0 g/mol is dissolved in 250.0 g of water, the freezing point of the resulting solution is -0.255 C. Calculate Ka for the unknown weak acid.
when relatively small amounts of magnesium burn the fires are extinguished using commercially available dry powder. why
What wavelength lambda should the astrophysicist look for to detect a transition of an electron from the n= 7 to the n=3 level
write this net ionic equation as a molecular equation showing allreactants and products as compounds. then rewrite this
Fe 2+(aq) + 6CN- (aq) -->/
Define the effect that van der Waals forces have in folding of globular proteins. Explain what sort of structures can be affected by van der Waals forces. Explain how would proteins fold differently in a world without van derWaals forces
From 5g of benzopinacol you obtained benzopinacolona 75% crude. The yield after recrystallization was 2 grams. benzapinacol molecular weight = 366.46 g / mol benzopinacolone molecular weight = 348.44 g / mol determine:
Compound A, C8H10, absorbed 3 equivalents of H2 on catalytic hydrogenation over a Pd/C catalyst to give B (C8H16). On ozonolysis, compound A gave, among other things, a ketone which was identified as cyclopentanone.
Which one of the following does not react with aqueous sodium hydroxide?
Liquid nitrogen has a density of 0.808g/ml at 77 K. A sample of 2.5 L of liquid nitrogen is allowed to evaporate at 21°C and 1.00 atm of pressure. what volume will the nitrogen gas occupy?(keep your phases straight)
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