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1. Suppose it is a very hot summer day and you want to cool your kitchen. Unfortunately the windows and doors in your kitchen cannot be opened. You have either a fan or a refrigerator to cool the kitchen. Which do you believe would be more effective to cool the room? (Hint: think about how a refrigerator works. Heat does not magically go away when the refrigerator is cooling the foods inside of it.)
2. Explain your answer then try testing your theory.
the 250-ml erlenmeyer flask has the mass of 78.639 grams. the mass of 250-ml erlenmeyer flask and water 327.039 grams.
dry air had a co2 mole fraction of 0.00038 in 2007 compared with 0.00032 in 1965. calculate the total mass of co2 that
Assume 1.0 mole of each of the following solutes is dissolved in water and that each solution has a constant volume.
A stock solution is 2.567 M in NaBr. A dilution is made by diluting 25.00mLs of the stock solution to a new volume of 1.500 liters. Explain how many grams of NaBr are present in the diluted solution
The equilibrium constants needed to work this problem are given in Table 2-3 (under Phosphoric Acid). Hint: use the mass balance equation for phosphate species and equilibria expressions to solve this problem
the partial pressure of o2 in air at sea level is 0.21 atm. using the data in table 13.2 together with henrys law
What volume (in mL) of water must be added to a 1.87 M solution of iron(III) chloride to make a 55.9 mL of a 0.71 M solution? Assume the volumes are additive.
How many grams of water H20 are in a sample that has 1.2 *10^(23) atoms of hydrogen
Which will experience the greater effective nuclear charge, the electrons in the n=3 shell in Ar or the n=3 shell in Kr. Which will be closer to the nucleus. Explain.
a first order reaction has a rate constant 0.00510.if we begin with 0.10 M concentration of the reactant , how much of the reactant will remain after 3 hrs?
For the reaction:-2 HCl + Na2CO3 - 2 NaCl + H2O + CO2 ,179.2 liters of CO2 is collected at STP.
The molecule ethanol (CH3CH2-OH) is very soluble in water. What intermolecular attraction is responsible for its solubility
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