Zadanie 6c
Suggest why banks of sodium-ion batteries are often installed alongside wind turbines.
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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. Al3S2; Al species [Ne]; S species [Ar] B. Al2S3; Al species [Ne] 3s2 3p1; S species [Ne] 3s2 3p4 C. Al2S3; 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 cm3 at 110 °C and a pressure of 1.00 × 105 Pa. Calculate the amount, in mol, of Z in this sample. Use…
Which molecule is polar? A. BF3 B. NF3 C. CCl4 D. C2H4
A white crystalline solid has the properties shown in the table. Which structure is consistent with these properties? A. Giant metallic lattice B. Giant covalent network C. Molecular covalent solid D. Giant ionic lattice
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…
Discuss the melting points in the table below in terms of the bonding and/or intermolecular forces present in each substance.