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When a glow stick is placed in a freezer, its chemiluminescence lasts a significant time longer. How might this come about?
A graduated cylinder contains 145mL of water. A 10.0g piece of iron (density = 7.86g/cm3 ) and a 22.0g piece of lead are added.
burning 0.115g of the compound in oxygen gives 0.379g of CO2 and 0.1035g of H2O. what is the empitical formula of mesitylene.
When chlorine reacts with 2-methylpropane and replaces only one hydrogen with chlorine
how many grams of benzene are needed in 46.3 grams NaBr (103 g/ mol)? the freezing point of solution to 3.94 degree C?
What mass of propane gas, C3H8, will occupy 860. mL at 880. mm Hg and 81.0°C?
2 NO(g) + O2(g) 2 NO2(g) In one experiment 0.633 mole of NO is mixed with 0.354 mole of O2. Calculate also the number of moles of NO2 produced.
In the first 12.0 s of the reaction, 1.8×10-2 mol of {rm{O}}_2 is produced in a reaction vessel with a volume of 0.260 L. What is the average rate of the reaction over this time interval?
Consider the following reaction. Hydroquinone is the oxidizing agent. Hydroquinone Benzoquinone 2(ag)^+ 2OH^- ---> +2(ag) + 2H2O
Under certain conditions, the formation of ammonia from nitrogen and hydrogen has an 8.12% yield. Under such conditions, how many grams of NH3 will be actually produced.
A 25.00 mL sample of NaOH is titrated with 26.14 mL of 0.1750 M HCl(aq). What is the concentration of the NaOH solution
why is it easier to analyze a mixture of atomic species by absorption spectroscopy than it is to analyze a mixture of molecular species?
A diprotic acid, H2A, has the following ionization constants: Ka1 = 1.1 multiplied by 10-3 and Ka2 = 2.5 multiplied by 10-6. In order to make up a buffer solution of pH 5.80, which combination would you choose, NaHA/H2A or Na2A/NaHA?
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