Zadanie 1b
Sulfapyridine is an antibacterial drug. Its structure is shown below. C11H11N3O2S Mr = 249.32 Calculate the mass percentage of nitrogen in sulfapyridine. Use section 7 of the data booklet.
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Sulfapyridine is an antibacterial drug. Its structure is shown below. C11H11N3O2S Mr = 249.32 Calculate the mass percentage of nitrogen in sulfapyridine. Use section 7 of the data booklet.
Which equation represents the condensation of bromine? A. Br2(g) → Br2(l) B. Br2(l) → Br2(g) C. Br2(l) → Br2(s) D. Br2(s) → Br2(g)
(i) Write a balanced equation for the reaction, including state symbols. (ii) Deduce what property of this reaction makes it possible to follow its rate by both methods. (iii) Magnesium carbonate was used in excess so that all of the acid would react.…
In Method 1 the flask containing 25.0 cm3 of the aqueous acid was put on the balance, which was then set to zero; 0.400 g of MgCO3 was added and the reading was noted every 20 seconds until the reaction had stopped. Each point is the mean of…
The student repeated the experiment using Method 2, with the same quantities of acid and solid. (i) Calculate the volume of gas that will have collected in the measuring cylinder once the reaction has finished, measured at T = 22 °C and…
(i) Magnesium burns in oxygen according to the equation . Explain, using electron configurations, how ions are formed by magnesium and oxygen and how these ions form a compound. (ii) Explain, using electron configurations, why…
Potassium also forms compounds with polyatomic ions. 2 KOH(aq) + Cu(NO3)2(aq) → Cu(OH)2(s) + 2 KNO3(aq) (i) 30.0 cm3 of a 0.380 mol dm−3 potassium hydroxide, KOH, solution is mixed with 25.0 cm3 of a 0.310…
What is the maximum number of electrons that can occupy the 3rd main energy level in an atom? A. 6 B. 9 C. 18 D. 32
(a) Outline two features of this experiment that ensure that the propanal intermediate is not a major product.
(b) Outline two safety precautions that must be taken during the preparation of propanoic acid, besides wearing a lab coat and safety goggles.