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- Draw a wave of blue electromagnetic radiation and a wave of red electromagnetic radiation. One of these waves should have a shorter wavelength than the order, so be sure to label the correct one with the correct color.
- True or false: Atoms can only emit and absorb photons with certain amounts of energy.
137Cs decays by beta minus emission to an isomeric state in 137Ba which then decays by the emission of a gamma-ray. If we start with a 4 mCi of pure 137Cs, define what will be the activity of 137mBa after five minutes. The half-lives of 137Cs as well..
Assume the value of Delta H for this reaction is -3.8*10^2 kJ/mol The formula is 4. 2HCl (l) + Mg (s) ??? MgCl? (s) + H? (g) Assume magnesium reacts with excess HCL. Calculate the heat that would be generated for a reaction of .20 g of magnesium m..
A 20.0-L flask contains 0.400 mole of H2, 0.300 mole of He and 0.500 mole of Ne at 55.0C. Explain what is the partial pressure of the Ne
When 33.4 mg of a compound is dissolved in 10.0 ml of water at 25 C the solution has an osmotic pressure of 558 torr. Calculate the molar mass of the compound.
How do the following changes affect the value of the equilibrium constant for a gas-phase exothermic reaction: 1. removal of a reactant
During a recrystallization a student takes 1g of a white (colorless) solid and adds 5 mL of acetone. He heats the mixture in a boiling water bath and adds another
A solution is made by dissolving 0.150 moles of benzoic acid (ka=6.5*10^-5) and 0.300 moles of sodium benzoate in enough water to give exactly 1.00 L of solution what is the solution pH
The difference in aqueous nucleophilicity between Cl- and Br- is observed in the product distribution for the Sn2 reaction of 1-butanol (n-butyl alcohol) but not for the Sn1 reaction of 2-methyl-2-propanol
You have 250.0 ml of 4.00 M sugar solution. You add 217.3 ml of water to this solution. Determine the concentration of the sugar solution after the water has been added
A 33.0-g sample of an alloy at 93.0°C is placed into 258 g of water at 22.0°C in an insulated coffee cup. Assume that no heat is absorbed by the cup. If the final temperature of the system is 31.1°C
Some plants require acidic soils for healthy growth. Which would be more productive to add to the soil in order to make it more acidic, Fe2(SO4)3 or Na2SO4, and why
Solution A has a pH of 1 and Solution B has a pH of 12. If you mix 5 L of Solution A and 10 L of Solution B and mix them completely, what is the resulting pH of the 15 L. no chemical reaction takes place when the 2 are mixed together.
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