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Chemistry
The manager of amedium-sized office hired a fire prevention specialist to give the annual fire training for their employees. In a pretest of the audience, the specialist said that lithium, sodium and potassium fires cannot be extinguished effectively by a carbon dioxide fire extinguisher. The reaction of these metals with carbon dioxide will produce ___ and ___€
an unknown element has two naturally occurring isotopes. isotope 1 has a mass of 107.0 amu and an abundance of 55.9.
A solution of NAOCH3 in methanol can be prepared by adding NaH to methanol (CH3OH). A flammable gas is produced as a byproduct. a) write the acid-base reaction that takes place
What mass of potassium chromate is needed to add to exactly 500g of water to produce a solution with vapor pressure of 21.50 torr at 24 C
you want a solution that will buffer the addition of either 10 micro moles of acid or 10 micro moles of base. total buffer concentration is equal to the concentration of the acid plus the concentration of salt in the acid. which of the following b..
Suppose that 1.331 g of impure barium hydroxide is dissolved in enough water to produce 250. mL of solution and that 35.0 mL of this solution is titrated to the stoichiometric point with 17.6 mL of 0.0935 M HCl(aq). What percentage of the impure s..
a sample of hydrogen effuses through a porous container about 9.00 times faster than an unknown gas. estimate the molar
A sample of 2.75 moles of carbon dioxide gas at 125°C and 248 torr occupies a volume of 275 L. Explain what will the gas pressure be if the volume is increased to 321 L at 125°C
List the major elemental and molecular components of gasoline. Include their chemical formulas.
Mixed in a constant-pressure calorimeter, the temperature of the mixture rose from 21.15 to 26.00. If the density of the solution is 1.0g/mL and its specific heat is 4.18J/g C, how much heat is evolved by this reaction in kJ
A) Colloids are homogeneous solutions. B) A true colloidal particle will not settle out of the dispersing medium. C) Colloidal particles can usually pass through a semipermeable membrane.
Rank the following carbonyl-containing compounds in order of reactivity towards nucleophilic acyl substitution. Rank them going from the most reactive, to the least reactive
At 7645 oC, Keq = 1.12 for the reaction: 1/2 N2(g) + 1/2 O2(g) ? NO2(g) (a) What is the value of Keq for the reaction NO2(g) ? 1/2 N2(g) + 1/2 O2(g)? Keq = . (b) What is the value of Keq for the reaction N2(g) + O2(g) ? 2 NO2(g)? Keq = . (c) What ..
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