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What is the effect when a system is driven in resonance? Is a particular frequency required? Explain. Would you expect to find a node or an antinode at the end of a plucked guitar string? Explain.
a helium-filled balloon has a volume of 2.75 l at 17 c. the volume of the balloon decreases to 2.36 l after it is
What is the age of a rock whose 40Ar /40Kratio is 1.25? The half-life of 40 K is 1.28 times 10^9years Formulas ln(N)t/(N)o =-k+ + 1/2 =0.693 /k
A radioactive sample contains 2.50 of an isotope with a half-life of 3.8 days.How much of the isotope in grams will remain after 14.2 days
What is the pressure exerted by some nitrogen gas collected in a tube filled with water on a day when the room temperature is 18.0ºC
Complete and balance the equation NaCl(aq)+Hg2(C2H3O2)2(aq). Express your answer in a chemical equation.
How many isomers are there for the trifluorotrinitrocobalt (III) complex? Draw them. Are any enantiomers. Label each structure with an appropriate descriptor
which types of solutes tend to be insoluble in pure water but soluble in acid or in base
Calculate ΔHrxn for the following reaction: CH4(g)+4Cl2(g)→CCl4(g)+4HCl(g) Use the following reactions and given ΔH′s.
how many grams of dry nh4cl need to be added to 2.10l of a 0.500 m solution of ammonia to prepare a buffer solution
Write net Bronsted equations and determine the equilibrium constants for the acid-base reactions that occur when aqueous solutions of the following are mixed.
when a particular marble is dropped into a beaker of water it sinks to the bottom. which is the best explanation? a.
a solution of water kb0.512 c and glucose freezes at 4.15. what is the molal concentration of glucose in this solution?
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