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1- Which method for determining the density (cylinder or pipette ) is more accurate? which method is more precise? explain why.
2- what are the possible sources of error when finding the density of a liquid and of a solid? what can be done to avoid these errors?
3- how do i calculate % NaCl of the unknown from a line equation?
DRAW skeletal structure of the major organic product formed when bromobenzene encounters solid Mg in an ether solvent.
Calculate the pH of the following aqueus solution: 0.61 M NH4Cl (pKb for NH3=4.74)
What is the molarity of a solution prepared by dissolving 10.5 grams of NaF in enough water to produce 750 mL of solution
According to the second law of thermodynamics, the change in the entropy of the universe (DeltaSuniv) during a spontaneous reaction
When runners or other athletes practice at high altitudes pressure is reduced. What then will be the effect on the [O2] in their blood? Why does this produce a lightheaded feeling?
if the initial water level in the graduated cylinder is 21.2 ml and the level rises to 27.7 ml after the object is placed in the cylinder, what is the volume of the object?
A buffer is prepared by mixing 675 mL of 0.50 M formic acid, HCHO2, and 325 mL of 0.50 M sodium formate, NaCHO2. Calculate the pH.
The specific heat of liquid water is 4.184 J/g x C. Calculate the energy required to heat 10.0 g of water from 26.5 C to 83.7 C.
A sample of helium effuses through a porous container 6.5 times faster than does unknown gas X?
A truck driver used sand to soak up a 1 g spill of lindane (C6H6Cl6). He placed the contaminated soil in an open drum which then filled with 150 L of water during a rainstorm.
A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 31 degrees C and 1.00 atm?
How many grams of lithium are required to completely react with 60.7 mL of N2 gas at STP?
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