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For which blocks of elements are outer electrons the same asvalence electrons? For which are d electrons oftenincluded among valence electrons?
For an enzyme assay you require a 50 mM Tris-HCl buffer, pH 7.8. How many grams of Tris (mw = 121, pKA = 8.1) and how any ml of 2 M HCl would you require to make 1 L of this buffer
The visible part of the hydrogen atom spectrum is called the Balmer series (n1 = 2). The violet line has a wavelength of 410.2 nm.
the steam distillate contains a significant quantity of water, along with the cyclohexanone. how is the water removed from the steam distillate?
Phenylacetic acid (C6H5CH2COOH) is one of the substances that accumulates in the blood of people with phenylketonuria, and inherited disorder that can cause mental retardation or even death
What is the concentration of the vinegar in weight percent? (Assume a density of 1.030 g/mL.) If the pH of the vinegar was 3.44, what value is obtained for the Ka of acetic acid?
what is the ph of a 0.15m solution of hcooh formic acid if the ka of formic acid hcooh is 1.8x10-4 at 25 degrees
High levels of ozone (O3) make rubber deteriorate, green plants turn brown, and cause people to have difficulty breathing. Calculate delta G at 298 K for the formation of 1 mole of O3 from O2 in urban smog, where [O2]=0.210 atm and[O3]=5.00x10^-7 ..
What is the minimum pressure (in torr) that must be applied across the semipermeable membrane to obtain water? Assume room temperature or about 298 K.
A closed vessel of volume3.0L contains a mixture of neon and fluorine. The total pressure is3.37atm at 0.0°C. When the mixture is heated to 15°C, the entropy of the mixture increases by 0.345 J·K-1
If we attemp to add a second nitogroup to methyl m-nitrobenzoate, would the reaction be faster or slower than the first nitration
Does that indicate the original alcohol is in that mixture? What is the source of 2-bromopentane?
What is the theoretical yield of aspirin in the reaction of 3.60 grams of salicylic acid with excess acetic anhydride?
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