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When a space shuttle re-enters the atmosphere, its temperature rises and it can heat the surrounding air to 1260oC. At that temperature some endothermic reactions take place that at lower temperatures are not spontaneous under standard conditions (pure substances, each at 1 bar). Estimate the temperatures at which the following stratospheric reactions become spontaneous under standard conditions. Which ones could occur during re-entry of the space shuttle?
a) The formation of nitrogen monoxide from nitrogen and oxygen
b) the formation of ozone from molecular oxygen
A possible side product of the aldol reaction of cinnamaldehyde and acetone is the self-condensation of acetone. draw the structure of the side product. explain how the experimental procedure we used is designed to minimize the formation of this s..
Nitromethane has a relatively high boiling point of around 100 c. Which of the following intermolecular force is not present in pure liquid nitromethane and why.
Find the mass of urea (CH4N2O) needed to prepare 50.8 g of a solution in water in which the mole fraction of urea is 7.55×10?2.
Elementary mercury was first discovered when a mercury oxide was decomposed with heat, foarming mercury metal and oxygen gas. Wehn 0.24-g sample of the mercury oxide is heated, 0.189-g of mercury metal reamins.
100 ml of 1 M acetic acid (pKa 4.76) are placed in a flask. what is the ph if 2mL of 1 M KOH are added, and the total volume is adjusted to one liter with water.
where r is the radius. Compute the volume of a sphere with a radius of 593 pm. State your answer in units of m3.
What is the enthalpy change when a 4.0 gram sample of aluminum burns in excess of oxygen to form aluminum oxide?
identify the following as characteristic of a solution, colloid, or suspension: a)particles of this mixture remain inside a semipermiable membrane, but pass through filters. b)the particles of solute in this mixture are very large and visible.
Determine how many milligrams of H 2 O are present in sample If the freezing point of a 100.0g sample of 2-methyl-2-propanol =24.59C?
Explain different moderators used in nuclear reactors
Write a balanced equation for the combustion of heptane, C7H16, in oxygen, , forming the products carbon dioxide, and water, H2O. How many grams of water will be produced by the complete reaction of 7.88 grams of heptane?
Draw the structural formulas for any three compunds with the molecular formula C4H10O. If its an alcohol, classify each alcohol as primary, secondary, or tertiary?
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