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The diagram below shows the battery connected to a charger. Annotate the diagram to show the direction in which electrons flow through the external wires while the battery is being recharged.
Suggest why banks of sodium-ion batteries are often installed alongside wind turbines.
A total charge of 1500.0 C flows through the external circuit during one discharge of the battery. Determine how many sodium ions are released at the anode. Use section 2 of the data booklet.
Which row shows the correct formula of aluminium sulfide and the electron configuration of each species in it? A. ; Al species [Ne]; S species [Ar] B. ; Al species [Ne] ; S species [Ne] C. ; Al…
When 3.71 g of Z was burned completely in excess oxygen, 8.81 g of carbon dioxide and 4.51 g of water were collected. Determine the empirical formula of Z. Use sections 1 and 7 of the data booklet.
A second sample of Z was converted completely into vapour at a known temperature and pressure. (i) 0.148 g of the vapour occupied 63.7 at 110 °C and a pressure of Pa. Calculate the amount, in mol, of Z in this sample. Use…
Which molecule is polar? A. B. C. D.
A white crystalline solid has the properties shown in the table. Property Observation Melting point 770 °C Electrical conductivity of the solid none Electrical conductivity when molten good Solubility in water soluble Which structure is consistent with these…
Kevlar is a condensation polymer. Deduce the structures of the two monomers from which Kevlar is made.
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…