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The best balances commonly found in laboratories can weight amountsas small as 10-5 g. If you were to count outcarbon atoms at the rate of two per second, how long would it take you to count a pile of atoms large enough to weigh?
question why does it take a temperature of almost 800 degrees c to melt nacl but stirring in water at room temperature
You need to make an aqueous solution of 0.191 M zinc sulfate for an experiment in lab, using a 125 mL volumetric flask. How much solid zinc sulfate should you add
A mixture of 80.0mL of hydrogen and 60.0mL of oxygen is ignited by a spark to form water. a) Does any gas remain un-reacted. Which one. b) What volume of which gas (if any) remains un-reacted
The rate constant for the second order reaction 2NO2 ® N2O4 is 2.79 L/mol ·min at 48 oC. If the initial concentration of NO2 is 1.05 M , what is the half-life? A) 20.5 s B) 10.3 s C) 0.341 min D) 176 s
The density of pure silver is 10.5g/cm3 at 20 C if 525 g of pure silver pellets is added to a graduated cylinder containing 11.2 ml of water to what volume
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour
A 4.10 g nugget of pure gold absorbed 287 J of heat. The initial temperature was 24.0°C. What was the final temperature?
The four molecular p orbitals of the four carbon atoms can be lined up parallel in order to create four new molecular orbitals. The electrons in the new molecular orbitals benefit because they are not confined to just one atom.
How many grams of calcium carbonate are needed to produce 374mL of carbon dioxide gas at STP in the following reaction?
Draw the product of the following reaction between a ketone and an alcohol. H3C--CO--CH3 + HO--CH2--CH3 ---H+--> how would you classify the product of the reaction? -alcohol -ketone -hemiacetal -acetal
Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with Ne.
Oxygen gas is commonly sold in 45.5 L steel containers at a pressure of 131atm .What volume (in liters) would the gas occupy if its temperature was raised from 20.0 C to 35.5 C at constant 131 atm
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