2021

The diagram below shows a simplified electrolytic cell used to electroplate a ring. 9.1 Define the term electrolyte. (2) 9.2 Is the pure chromium metal the ANODE or the CATHODE of the cell? Give a reason for the answer. (2) 9.3 Write down the half-reaction that takes place at the ring. (2) 9.4 Calculate the … Read more

The table below shows two half-cells, A and B, used to assemble an electrochemicalcell under STANDARD CONDITIONS. 8.1 State the energy conversion that takes place in this cell. (1) 8.2 Calculate the mass of silver nitrate, AgNO3, used to prepare 150 cm3 of the electrolyte solution in half-cell B. (4) 8.3 Define the term reducing … Read more

Consider the balanced equation below for a hypothetical reaction that takes place in a sealed 2 dm3container at 300 K.2P(g) + Q2(g) ⇌ 2PQ(g) 6.1 Define the term chemical equilibrium. (2) 6.2 The amount of each substance present in the equilibrium mixture at 300 K is shown in the table below. The temperature of the … Read more

The reaction of 15 g of an IMPURE sample of calcium carbonate, CaCO3, with EXCESS hydrochloric acid, HCℓ, of concentration 1,0 mol∙dm-3 , is used to investigate the rate of a reaction. The balanced equation for the reaction is:CaCO3(s) + 2HCℓ(aq) → CaCℓ2(aq) + H2O(ℓ) + CO2(g)The volume of CO2(g) produced is measured at regular … Read more

4.1 Compound P is used as a starting reactant in each of two reactions as shown in the flow diagram below.

The melting points and boiling points of four straight-chain ALKANES are shown in the table below. 3.1 Define the term melting point. (2) 3.2 Write down the general conclusion that can be made about the melting points of straight-chain alkanes. (2) 3.3 Name the type of Van der Waals forces between molecules of octane. (1) … Read more

The letters A to H in the table below represent eight organic compounds. 2.1 Define the term unsaturated compound. (2) 2.2 Write down the:2.2.1 Letter that represents an UNSATURATED compound (1) 2.2.2 NAME of the functional group of compound C (1) 2.2.3 Letter that represents a CHAIN ISOMER of compound C (2) 2.2.4 IUPAC name … Read more

1.1 Which formula shows the way in which atoms are bonded in a molecule butdoes not show all the bond lines?A. EmpiricalB. MolecularC. StructuralD. Condensed structural (2) 1.2 Which ONE of the following compounds has hydrogen bonds between itsmolecules?A. CH3(CH2)2CH3B. CH3COCH2CH3C. CH3COOCH2CH3D. CH3CH(OH)CH2CH3 (2) 1.3 Consider the compound below. Which ONE of the following is … Read more