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In a sample containing small grains of sand, what would you observe in the Mel-Temp apparatus when you melt the sample that would indicate to you that your sample contained this type of impurity
If you compare the melting point of a slightly impure mixture with the melting point of a pure compound, the melting point of the slightly impure mixture will be: a) broader and lower than the eutec
100 mL of 0.06 M TRIS hydrochloride (C4H12ClNO3) is titrated with 1.0 M sodium hydroxide (NaOH). The titration curve is shown. What is the approximate pKa
Write a balanced reaction for the complete combustion of ethanol (C2H5OH) in oxygen, using the smallest integer coefficients.
The concentraion of comercially availble concentrated nitric acid is 70.0 percent by mass, or 15.9M. Calculate the density of the solution (Please explain in detail how to find density) Density in g
A compound is known to contain 52.17% carbon and 27.78% oxygen by mass. Each molecule contains two atoms of oxygen. What is the molar mass of this substance
A solution of CaCl2 has a density of 1.071 g/ml and a standard deviation of 0.008 g/ml. What is the concentration
Select all of the correct statements about reaction quotients and equilibrium constants from the choices below.
A solution of a specific vitamin has ?max = 251nm and a concentration of 4.79x10^-7M. The absorbance of the solution at 251 nm is A = 0.175. What is the molar absorptivity of the vitamin at 251nm
If the molality of your solution is 0.30, calculate the contribution to the percentage error in your results due to not correct for the errors in the thermometer readings.
Consider two samples of liquid: one mole of water H2O and one mole of ethanol C2H5OH. The density of water is 1.0 g/mL, and the density of ethanol is 0.785 g/mL
Ringer's solution, used in the treatment of burns and wounds, is prepared by dissolving 8.6 g of NaCl, 0.30 g of KCI , and 0.33 g of CaCl2 in water and diluting to a volume of 1.00 L . What is the
The concentration of glucose in blood is approximately 90 mg/100 mL. What is the weight/volume percent concentration of glucose. what is the molariy of glucose
A 0.4243-g sample of CaCO 3 is dissolved in 12 M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. How many moles of CaCO 3 are used (formula mass = 1 00.1 )
Mark all the true statements A.) The value of [R]/[P] is the equilibrium constant B.) The amount of P present will not change. C.) The concentration of [R] is constant. D.) The reaction P--> R no
At 2000°C the equilibrium constant for the reaction is Kc = 2.4 103. 2 NO(g) N2(g) + O2(g) If the initial concentration of NO is 0.100 M, what are the equilibrium concentrations of NO, N2, and O
Assuming levels of atmospheric CO2 are 390 ppm CO2, what is the pH of rainwater in equilibrium with the atmosphere for the pre-industrial atmospheric CO2 concentration of 280 ppm,v
One company introduces carbonate by bubbling carbon dioxide into water until CT=10-3 M (equivalent to adding "H2CO3*" until CT = 1 x 10-3 M), a second adds sodium bicarbonate (NaHCO3) until CT = 10-
At 298 K and 1 bar pressure, the density of water is 1.00 , and C=75.3J K^-1 mol^-1. The change in volume with temperature is given by delta V=Vinitial*beta delta T , where beta, the coefficient of
To convert from the volume by percent of a gas to the mole fraction of a gas (i.e. problem 35 from chapter 9), why is it that all you have to do is divide the volume percent by 100%
briefly describe the theory behind IR spectroscopy and why it is a valuable technique to chemists.
A silicon water is etched in a Cl2 plasma. A mass flow controller (used to meter the gas flow fed to the reactor) shows a reading of 100 sccm (sccm=standard cm3 per min; standard conditions are 273
The specific heat of an unknown metal is found to be 0.233 J/K g. The Law of Dulong and Petit predicts a molar heat capacity of 26 J/K mol. Use this law to estimate the molar mass of the metal.