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Suppose that your instructor gives you two samples and claims that they are both phosphorous cloride (ClP).
Through a series of tricky chemical reactions, your instructor has you decompose both samples into the constituent chlorine and phosphorous, and you weigh each of your sample components on the analytical balance. You find that one sample produced 3.55 g Cl and 6.04 g P, while the other produced 3.05 g Cl and 3.94 g P.
Are these results consistent with the law of constant composition?
What mass of Cu and of N (in grams) are contained in 250.7 g of sample that is 75.4% pure Cu(NO3)2 by mass. (Assume that the impurities do not contain Cu and N.)
What is the volume of the air space when the bell has been lowered to a depth of 50m? Take the density of sea water to be 1.025gcm^-3 and assume that the temperature is the same as on the surface
Explain the Kinetic Molecular Theory and describe how it helps us understand the phases of matter and behavior of gasses.
The amino acid glycine is often used for biochemical buffers. The amino group of glycing can exist in a protonated form or as a free base (pKa 9.6).
The distribution coefficient, K= conc. in ligroin/conc. in water, between ligroin and water for solute A is 7.5. what weight of A would be removed from a solution of 10g of A in 100 mL of water.
Compare a refrigerator set at +2 oC and a freezer set at -18 oC, both of which are operating in the room with temperature of +20 oC. What is relative amount of electric energy that will need to be used in both cases to cool a cup of water
1.isobutene is formed by following radical polymerization process that follows chain transfer to monomer is the
A 16.0-mL sample of an unknown HClO4 solution requires titration with 25.5mL of 0.210M NaOH to reach the equivalence point. What is the concentration of the unknown HClO4 solution? The neutralization reaction
Calculate the energy of the photons and determine which principal quantum levels the transition might come from.
After 24 hours, the local electrician was able to restore power to the freezer, allowing the freezer to return to a temperature of -5 °C and a pressure of 0.95 atm.
A 1.0 L buffer solution is 0.250 M LiC2H3O2 and 0.050 M HC2H3O2 . Which of the actions will destroy the buffer? (a)adding 0.050 moles of LiC2H3O2(b)adding 0.050 moles of HCl(c)adding 0.050 moles of HC2H3O2(d)adding 0.050 moles of NaOH.
In Photosystem II of the thylakoid membrane of chloroplasts, approximately 16.3 moles of photons must be absorbed by chlorophyll pigments in order to obtain enough energy to produce one molecule of glucose
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