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Define briefly why quartz SiO2(s) is much harder than dry ice CO2(s) although the very similar formula.
Compute oxide spontaneously absorbs water vapor from the atmosphere at 20 degrees Celsius via the following reaction CaO(s) + H2O(g) arrow Ca(OH)2(s)
Based on this information forecast the signs (+ and -) for the entropy change as well as for the enthalpy change in this reaction explain your reasoning briefly
What happens to these physical properties as the strength of intermolecular forces (London dispersion forces, Dipole-dipole forces, Ion-dipole forces, Hydrogen-bond forces) increases
suppose you want to do a physiological experiment that calls for aph 6.5 buffer. you find that the organism with which
a peroxidase enzyme isolated from human red blood cells was found to contain 0.29 selenium. what is the minimum molar
glass is a notorious source of metal ion contamination. three glassbottles were crushed and sieved to collect 1-mm
Suppose NaHCO 3 is a dominating constituent - How to find the production rate of NaHCO 3
Analysis of an unknown solution produces absorbance values of: 0.45 @ lambda max for B 0.75 @ lambda max for A What is the molar concentration of the unknown
A 25.0-mL aliquot of vinegar was diluted to 250 mL on a volumetric flask. Titration of 50.0-mL aliquots of the diluted solution required an average of 34.88 mL of 0.09600 M NaOH. Express the acidity of the vinegar in terms of the percentage (w/v) ..
Predict the major and minor products of the following reaction. Name the products using systemic names. CH3CH2CH=CH2+H20->H+
Sample were collected in a zinc smelter to determine the exposure of a furnace tender to lead fume during his normal work duties which involves "furnace draws" and general activities around the furnace.
you need 4.5L of nitric acid solution with ph 6. you have unlimited amounts of nitric acid solution with a hydronuim ion concentration of 0.01M. Describe how you would form the required solution from the standard solution?
A compressed air tank carried by scuba divers has a volume of 9.5 L and a pressure of 130 atm at 20 C. What is the volume of air in the tank (in liters) at STP?
The activation energy of a reaction is 56.8kJ/mol and the frequency factor is 1.5*10^11/s. Calculate the rate constant of the reaction at 26degrees C
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