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Consider an electron moving from an n = 2 orbital to an n = 1 orbital. For this to occur, will the atom need to absorb energy or dissipate energy by releasing a photon of electromagnetic radiation? Is the n = 2 orbital more or less stable than the n = 1 orbital?
A solution of a weak acid was tested with the indicators used in this experiment. The colors observed were as follows
An experiment produces 15.0 grams of hydrogen for every 71.0 grams of oxygen used. How many grams of oxygen will you need to produce 6.0 g of hydrogen
The density of ocean water at a depth of 10,000 m is 1.071 g/mol and if 27 g of water at that depth contains 185 mg of potassium chloride, what is the molarity of potassium chloride in the sample
how many joules of heat are needed to completely vaporize 24.40 g of water at its boiling point?
what is the species list when titrating with hydrochloric acid? Aniline (benzenamine) has the formulas C6H5NH2. Its conjugate acid is C6H5NH3+.
calculate the mass of a sample of copper that occupies 4.2* 10^-3 cm^3 if the density of gold is 8.94 g/cm^3.
Silver metal crystallizes in a face-centered cubic lattice whose unit cell has sides 409 pm long. Use this info and the atomic weight to calculate the density of silver
we use 1 g of unknown acid added with 120 mL of distilled water ,the solution filtered , then we took 25 mL of this unknown acid for titration. we use NaOH base for titration
Then 2.00 mL of solution containing 0.0156 M dopamine was mixed with 90.0 mL of unknown, and the mixture was diluted to 100.0 mL in volumetric flask. The signal from the new solution was 58.4 nA. What is the dopamine concentration in the unknown s..
Molecules are mobile in a gas and some reactions can be run in the gas phase. Give several reasons solutions are preferable for synthetic reactions.
How could you convert butanoic acid into the following compounds? Write each step showing the reagents needed. (a) 1-Butanol (b) 1-Bromobutane and (c) Pentanoic acid
Suppose that the solvent ethanol could serve to replace the methanol in this process, but at the expense of double the concentrations of the solvent in the atmosphere.
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