Zadanie 17d
Deduce which of aspirin and camphor gives 1H NMR signals with chemical shifts between 6.9 and 9.0 ppm, and give a reason. Use section 21 of the data booklet.
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Deduce which of aspirin and camphor gives 1H NMR signals with chemical shifts between 6.9 and 9.0 ppm, and give a reason. Use section 21 of the data booklet.
Calcium carbonate is an active ingredient in some antacid tablets. Write an equation, including state symbols, for the reaction of calcium carbonate with the hydrochloric acid in the stomach.
Ibuprofen and glyceryl trinitrate (GTN) are two drugs with the structures shown. Deduce, giving a reason, whether the 1H NMR spectrum of ibuprofen or of GTN has signals with chemical shifts in the 6.9–9.0 ppm region. Use section 21 of the data booklet.
Which combination of signs of ΔH and ΔS belongs to a reaction that is not spontaneous at low temperatures but becomes spontaneous at high temperatures? A. ΔH positive and ΔS positive B. ΔH negative and ΔS…
A reaction is not spontaneous at low temperatures but becomes spontaneous when the temperature is raised sufficiently. What are the signs of ΔH and ΔS for the reaction? A. ΔH positive, ΔS positive B. ΔH negative, ΔS negative C. ΔH positive, ΔS…
Which statement correctly explains why a reaction is faster when a catalyst provides an alternative reaction pathway? A. It raises the average kinetic energy of the reacting particles. B. It lowers the activation energy, so a greater proportion of collisions…
The mass spectrum of ibuprofen (Mr = 206) has a peak at m/z = 161. Suggest which fragment, lost from the molecular ion, could account for this peak. Use section 22 of the data booklet.
How does a catalyst increase the rate of a reaction? A. It increases the average kinetic energy of the colliding particles. B. It lowers the activation energy so that a greater proportion of collisions are successful. C. It makes the reaction more exothermic.…
Salbutamol, used to treat asthma, has a relative molecular mass Mr = 239. Its mass spectrum has a peak at m/z = 221. Suggest a neutral fragment whose loss could account for this peak. Use section 22 of the data booklet.
The rate of the reaction 4 PH3(g) → P4(g) + 6 H2(g) can be expressed as the rate of change of the concentration of P4 with respect to time, Δ[P4]/Δt. Which expression is numerically equal to this rate? A.…