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Which generally comes first in solving problems, hypothesis or experiment? What is the difference between a law and a theory? What does the controversy over the "face" on Mars illustrate?
Combustion of a 1.50 g sample of a hydrocarbon produces 4.88g of CO2 and 1.5 g H2O. What is the empirical formula
Nitrous oxide gas is used by some denatl practitioners as a anesthetic. Nitrous oxide can be produced in small quantities in the laboratory by cardful heating of ammonium nitrate. Write the unbalanced chemical equation for the reaction.
Consider the reaction.mc019-1.jpgAt equilibrium, the concentrations of the different species are as follows.[NH3] = 0.105 M[N2] = 1.1 M[H2] = 1.50 M
Suppose you have a solution that might contain any of the following cations: Ni^(2+), Hg^(+), Fe^(3+) and Ca^(2+). Addition of excess HCl causes a precipitate to form.
Sulfamic acid, HSO3NH2 (molar mass = 97.1 g/mol), is a strong monoprotic acid that can be used to standardize a strong base: HSO3NH2(aq) + KOH(aq) --> KSO2NH2 (aq) + H20(l)
how much heat in kilojoules is evolved or absorbed in each of the following reactions?a burning of 15.5g of
Cyclo-butadiene,C4H4, has a delocalized pi system. Write out the Huckel secular determinant equation for cyclo-butadiene.
camphor was reduced by an excess of sodium borohydride to make 1.3 g of isoborneol. Calculate the theoretical yield and percent yield for this reaction.
The flask was then shaken until the solution was uniform. A 55.0-mL sample of this glucose solution was diluted to 0.500L . How many grams of glucose are in 100mL of the final solution?
Given that the Ka for hypochlorous acid is 3.0x10^-8 determine the number of moles of sodium hypochlorite needed to prepare this solution.
The wind speed is 4.8 m/s on a slightly sunny morning and plume rise is 20 m. (a) Calculate the ground-level centerline concentration 2.0 km downwind from the stack. (b) Calculate the concentration at 100 m off the centerline at the same x distanc..
The question in the lab is asking what percentage by mass is the calcium, chloride and water in the orginal solution for each trial. In this lab we performed two trials, in each, we added 50 mL water to 2.0 g of CaCl2.
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