Zadanie 3c
Bronze, an alloy of copper and tin, is used for ship propellers and bearings. Explain, by referring to its structure, why bronze is less malleable than pure copper.
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Bronze, an alloy of copper and tin, is used for ship propellers and bearings. Explain, by referring to its structure, why bronze is less malleable than pure copper.
Boron trifluoride, BF3, reacts with ammonia to form the adduct F3B−NH3, in which a coordination bond joins the boron atom to the nitrogen atom. Deduce whether the boron atom in BF3 acts as a nucleophile or an electrophile, and as a Lewis…
A steel cylinder of volume 5.0 dm3 holds 2.0 g of helium at 27 °C. Ar(He) = 4.0; R = 8.31 J K−1 mol−1; PV = nRT Which expression gives the pressure of the helium, in Pa? A.…
Sulfur dioxide, SO2, can be represented by more than one Lewis (electron dot) structure. (i) Sketch two different Lewis (electron dot) structures of SO2, one in which all atoms obey the octet rule and one in which sulfur does not. (ii) State the…
Suggest why sulfur dioxide released into the atmosphere is an environmental concern.
Sulfuryl chloride, SO2Cl2, is made industrially from sulfur dioxide and chlorine in the presence of an activated carbon catalyst. SO2(g) + Cl2(g) ⇌ SO2Cl2(g) ΔH⊖ < 0 (i) Sketch a potential energy profile for the forward reaction,…
Nylon-6,6 is a polyamide used to make strong fibres. A section of one chain is shown; asterisks indicate continuation bonds. Compare and contrast the bonding and the intermolecular forces in nylon-6,6 and in graphite.
The mass spectrum of a sample of element X is shown. What is the relative atomic mass of X? A. 69.0 B. 69.8 C. 70.0 D. 70.2
In a titration, 25.00 cm3 of a 0.120 mol dm−3 solution of a weak monoprotic organic acid, HA, was neutralized by adding sodium hydroxide solution, NaOH(aq), from a burette. The pH curve obtained is shown. (i) Determine the…
Outline how 0.100 mol dm−3 solutions of ethanoic acid and nitric acid could be told apart.