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Question 1: Which of the two fuels below should have a higher octane rating? Please explain.
(a) Octane (CH3CH2CH2CH2CH2CH2CH2CH3) or 2,3,3-trimethyl-pentane [CH3CH(CH3)C(CH3)2CH2CH3]?
(b) Benzene or hexane?
Question 2: Water gas (which is is a mixture of H2 and CO) can be made by reacting red hot charcoal (C) with steam (H2O).
a. Write the balanced equation for this reaction.
b. Show, how can the obtained water gas itself be used as a fuel (write the balanced reactions of complete combustion of H2 and CO).
For each of the following pairs of substance, predict which member of the pair will have the higher melting point, and explain why. a) NaCl and Cl2 b) SiO2 and CO2 c) Cu and CO d) NaF and MgO e) Na2) and SiC f) HCl and HF g) Ar and NO
Explain the percent concentration of a solution is a ratio of the amounts of dissolved solute and solution, expressed as a percentage. The percent concentration of a solution can be written usually as %concentration=amountofsoluteamountofsolutionÃ..
At what temperatures is this reaction spontaneous at standard conditions. Assume that ?H° and ?S° do not depend on temperature.
How would you prepare a suspension for analysis of trace compounds, getting a repersentative sample
Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 40. cm3. If the combustion of this mixture releases 860. J of energy, to what volume will the gases expand against a constant pressure of 650
What is the pH of a buffer solution that is 0.34 M in Na2HPO4 and 0.46 M in KH2PO4. Ka1 = 7.1E-3, Ka2 = 6.3E-8, and Ka3 =4.5E-13.
Which of the following is a forbidden transition? please give a brief explanation why you chose your answer a) L=3 m=2; l=2 m=2 b)L=3 m=2 ;l=2m=0 c) L=3m=2; l=4 m=3 d) L=3 m=2; l=2m=1
When 2.20 grams of Cr(CO)6 reacts according to the following equation at 400 °K in a closed system the temperature goes down and 5.2 kJ of hear is absorbed
calculate the amount of heat released when 50g of steam at 100 degrees celsius hits the skin condenses and cools to a
A 40-year-old manager, at a prominent legal firm in L.A., experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps
Assume that the estimates of the standard deviation for the mean mass of a series of three measurements, a serious of six measurements, and a series of nine measurements were identical.
Problem- A bag of pretzels has a mass of 279.2 grams and costs $1.69. If a bag contains 20 pretzels, what is the cost of a pound of pretzels
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