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Many metals pack in cubic unit cells. The density of a metal and length of the unit cell can be used to determine the type for packing. For example, sodium has a density of 0.968 g/cm3 and a unit cell side length a of 4.29 Å. (1 Å = 1. 10-8 cm.) (a) How many sodium atoms are in exactly 1 cm3? atoms (b) How many unit cells are in exactly 1 cm3? (c) How many sodium atoms are there per unit cell? atom(s) (d) The atoms/unit cell suggests that sodium packs as a unit cell.
how much energy is released when 89 grams of water vapor (steam) is cooled from 503 K to 354 K?
A bicycle tire is filled with air to a pressure of 720 torr at a temperature of 19 degrees Celsius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees Celsius.
Write the chemical equation(s), including state symbols, for what happens when each soluble ionic compound that you identified above is placed in water. Are these substances reacting with water when they are added to water?
Propose a structure for a C6H15O2N compound that is unstable in aqueous acid and has the following NMR spectra:1H NMR:
What would be the atomic numbers of the first three noble gases in that universe? What would be the atomic numbers of the first three halogens?
Dopa (Levodopa) is an oral medication used to treat Parkinson\'s disease, the symptoms of which result from a lack of dopamine in the brain. L-Dopa relies on L-type, or leucine-preferring, transport proteins to cross the blood-brain barrier
A solution of ethanol (C2H5OH) in water is prepared by dissolving 88.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 300.0 mL of solution. What is the molarity of the ethanol in this solution?
In the following reaction, how many grams of NaBr will produce 244 grams of NaNO3? Pb(NO3)2(aq) + 2 NaBr(aq) PbBr2(s) + 2 NaNO3(aq)
A sample of solid having a density of 4.88 g/cm3 had an apparent mass of 16.0886. The density of the balance weights is 8.00 g/cm3. Calculate the true mass of the object.
How would you prepare methyl,phenyl,ketone starting with 1-bromobenzene without using a grignard reaction. please show reactants and intermediates
A flask contains 0.190 mol of liquid bromine, rm Br_2. Determine the number of bromine molecules present in the flask.
When an aqueous solution of an organic compound is shaken with an immiscible organic solvent, such as diethyl ether, the solute distributes itself between the two phases. When the two phases separate into two distinct layers, an equilibrium will h..
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