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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).
How much heat is evolved when 100.0 g of liquid water is formed from the combustion of gaseous hydrogen and gaseous oxygen. DHof (H2O liq) = -285.8 kJ
What types of limitations and obstacles must any plausible origin of life scenario overcome, and why did Crick believe life couldn't have formed on Earth?
rank the following compounds in order of decreasing vapor pressure. rank from highest to lowest vapor pressure. to rank
An aqueous solution of calcium nitrate is allowed to react with an aqueous solution of potassium carbonate. The net ionic equation would contain.
Dinitrogen oxide can be produced by heating solid ammonium nitrate to 200 degrees C or more. (At 200.0 degrees C, N2O and H2O are both gases.) If the 2.00 kg of solid NH4NO3 were heated to 200.0 degrees C in a 250.
a bottle contains 225 ml of insulin at a concentration of 50.0 mgml. what is the total mass of insulin in the
The height of a cylindrical container is 29.51 cm and the diameter is 20.50 cm. How many gallons of water can this container hold. Solve by dimensional analysis
The isomerization of cyclopropane follows first order kinetics. The rate constant at 700 K is 6.20*10^-4 min-1, and the half life at 760 K is 29 min. Calculate the activation energy for this reaction.
For each of the half cells compare electrode potentials calculated from (1) concentration and (2) activity data. a) HCl (0.0200 M), Nacl (0.0300 M)|H2 (i.00 atm), Pt b) Fe(Clo4)2 (0.0111M), Fe(ClO4)3(0.0111M)|Pt
If the volume of ocean water 5.4*10^20) contains 4.1 percent sodium chloride ("salt") by mass and the density of the water is 1.86 g/mL, calculate the total mass of sodium chloride.
Iodine 131 has a half life of 8 days and decays by a first order process (as is always the case for radioactive decay). How much of a 48 gram sample of iodine 131 will remain after 8 days? answer in grams.
your body deals with excess nitrogen by excreting it in the form of urea nh2conh2. the reaction producing it is the
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