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Even if a cospotted TLC analysis of an unknown with an authentic standard is performed, one still does not know with complete certainity that the unknown and the standard are identical.
A chemist wants to prepare 0.42 MHCl. Commercial hydrochloric acid is 12.4 M. How many milliliters of the commercial acid does the chemist require to makeup 1.63 L of the dilute acid?
Bromine is composed of atoms having mass numbers 79 and 81.calculate the % of each isotope, if the atomic number is79.91? What is the proper isotope notation for the bromine isotope 79if it has gai
A 47.5 gram sample of a metal at a temperature of 425 degrees C is placed in 1.00 L (1000 g) of water which had an initial temperature of 18 degrees C.
An electron in a hydrogen atom falls from a n=4 level to a lower level, emitting light with a wavelneth of 486 nm. What value of n was the lower level to which the electron fell?
Mass measurement of the crucible, lid, and sample are performed only at room temperature. Why is this technique necessary for a gravimetric analysis?
List six physical properties of organic compounds that are often measured by organic chemists in attempting to identify a compound.
Calculate the theoretical EQ yield of AgAc obtainable if0.010 mol of Ag3PO4 is treated with 1.0L of 6.0 M Hac.c. If the experiment considered in (b) was actually performed,some solid should be prese
Cortisone is a natural steroid that can be isolated from the adrenal cortex. It has anti-inflammatory properties and is used totreat a variety of disorders.
A cup of chicken soup (500.0 g) is heated from 20 degrees C to 98degrees C in a microwave oven that operates at wavelength = 1.55 x10-2 m. How many moles of photons are absorbed by the soup? As
A 8.97 g sample of C4H6, is mixed with 21.8atm of O2 in a 28.0 L combustion chamber at 182.88°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 182.
A 2.3995 g mixture containing malachite and an inertingredient lost 0.2997 g of H2O and CO2 when decomposed by heating to constant m
When 100.0 mL of a solution of an acid, HA, and 100.0 mL of asolution of a base, BOH, are mixed in a calorimeter, thetemperature increases from 21.7 degrees Celsius to 35.8 degrees Celsius. The heat
0.12g of rock salt (NaCl and impurities) was dissolved in water and titrated with 0.1 M silver nitrate. 19.7 mL was required to titrate all the chloride ion.
What is the nuclide symbol for the nucleus that contains 6 protons and 7neutrons? (Enter the mass number in the first raised box, theatomic number in the second lower box, and the element's symbol,w
If 19.0 mL of 4.18E-2 Mbarium hydroxide are required to neutralize the hydrobromic acid, what is the percent by weight of hydrobromic acid in the mixture?
A hot air balloonist puts 125,000 liters of air into their balloon at 27oC and atmospheric pressure of1. When they heat the air to 200o C at constant pressure, what is the final volume of the air
What is the combines mass of 225.08g. When a liguid is added to the beaker the combined mass is 238,544 g. what is the mass in grams of the liquid?
A current of 2.50 A was passed through an electrolytic cell containing molten CaCl2 for 4.50 hours. How many moles of calcium metal shoild be deposited?
What is the physical basis for angle-bending strain? What might one do to verify that the global strain-energy minimum has been identified for a compound?
What is the relationship between the equilibrium constant (Kc)of a reaction and the rate constants for the forward (Kf) and reverse (Kr) reactions?
How do you know how many atoms are there in an element? How do you name an element with the sitting out of amount of protons, electron and neutrons?
The half life for the first order conversion of cyclobutane toethylene,C4H8(g) --->2C2H4(g) is 22.7 s at a particular temperature. How many seconds are needed for the partial pressure of cyclobut
The activity of a radioisotope is 3000 counts per minute atone time and 2736 counts per minute 48 hours later. What is the half-life of the radioisotope?
Why was it necessaryto wash the crude methylcyclohexenes with aqueous sodium bicarbonate solution? List the manipulations where mechanical loss of productcould have occured.