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Problem- Describe the residue left on the filter paper after you have filtered the water, sand, and sodium carbonate mixture. What do you think this residue contains?
Describe the appearance of the filtrate that flowed into the evaporating dish. Could this filtrate be a mixture? If so, does it appear to be homogenous or heterogenous?
Did the carbon dioxide in the dry ice undergo a physical or a chemical change before you inserted the burning plint into the beaker? Briefly explain.
Explain the each and every step in detail for help
Calculate the fraction of hexane molecules that reside in the vapor above the solution
The daily dose of ampicillin for the treatment of an ear infection is 115 mg/kg of body weight. What is the daily dose for a 34-lb child?
a sample of hfrac12o with a mass of 46.0 grams has a temperature of -58.0 agravec. how many joules of energy are
Nitrogen gas when combined with hydrogen gas forms ammonia gas according to the following equation N2(g) + 3H2(g) = 2NH3(g). Delta H(rxn)=-56 kJ. The delta H(rxn) was determined using Hess's Law and the following three related reactions:
the fuel has an average formula of 15 of the heat generated from combustion goes to heat the water (the rest is lost to the surroundings); the density of the fuel is 0.78 the initial temperature of the water is 25.0 and the standard enthalpy of fo..
Consider methyl cyanide, H3CCN. a.) Draw the best possible Lewis structure of methyl cyanide. b.) Predict the geometry and hybridization of each carbon atom. c.) Describe the bonding in this molecule in terms of sigma
A gas expands from 282 mL to 971 mL at constant temperature. Calculate the work done (in joules) by the gas if it expands against a vacuum.
Determine the following characteristics of the titration curve for 25.0 mL of 0.400 M NH3(aq) titrated with 0.335 M HI(aq). (For NH3, Kb = 1.8x10-5.) Enter scientific notation as 1.23E4.
The molecules of a certain gas sample at 313 K have a root-mean-square (rms) speed of 297 m/s. Calculate the most probable speed and the mass of a molecule.
Because of increasing evidence of damage to the ozone layer, chlorofluorocarbon (CFC) production was banned in 1996. However, there are about 100 million auto air conditioners that still use CFC-12 (CF2Cl2). These air conditioners are recharged fr..
a buffer that contains 0.52 m base b and 0.33 m of its conjugate acid bh has a ph of 8.78. what is the ph after 0.0032
When crystals of D-fructose are dissolved in basic aqueous solution, two aldohexoses are obtained. Propose the structures for the aldohexoses.
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