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Kevlar owes its high strength to hydrogen bonds between neighbouring polymer chains. (i) Annotate the diagram below to show a hydrogen bond between the two chain sections, drawing the hydrogen bond as a dotted line. (ii) Outline how a hydrogen bond forms…
Discuss the melting points in the table below in terms of the bonding and/or intermolecular forces present in each substance. Substance Melting point / K Silicon dioxide (quartz) 1986 Poly(propene) 433
Hydrogen fluoride boils at 20 °C, whereas hydrogen chloride boils at −85 °C. Which type of intermolecular force accounts for the much higher boiling point of hydrogen fluoride? A. Hydrogen bonding B. Dipole-dipole forces C. London (dispersion) forces D.…
4.81 g of sulfur was heated in a stream of chlorine gas until the reaction was complete. The mass of the chloride produced was 10.13 g. (i) Calculate how many atoms are present in this 4.81 g sample of sulfur. Use sections 2 and 7 of the data booklet. (ii)…
Outline why shows a greater deviation from the ideal gas model than carbon dioxide, , does.
Deduce, giving a reason, which of the two dyes, orange or violet, is the more polar.
Which of these alkanes boils at the lowest temperature? A. B. C. D.
The boiling points of the five simplest straight-chain primary amines, to , and of the five simplest 1-fluoroalkanes, to , are plotted below against the number of carbon atoms in the molecule. An…