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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
Learners prepare a solution of known concentration by dissolving 2 g pure sodium hydroxide crystals, NaOH, in water in a 250 cm3 volumetric flask.7.1 Write down the term for the underlined phrase. (1) 7.2 Calculate the:7.2.1 Concentration of the sodium hydroxide solution (4) 7.2.2 pH of the solution (4) The learners now react 1,5 g … Read more
Pure hydrogen iodide gas, HI(g), of concentration 1 mol∙dm-3 , is sealed in a 500 cm3container at temperature T. The reaction reaches equilibrium according to the following balanced equation: 6.1 Define the term chemical equilibrium. (2) 6.2 The graph below shows how the concentrations of the reactant and products vary with time during the reaction. … Read more
4.1 The flow diagram below shows the conversion of propane to propan-2-ol. 4.1.1 State ONE reaction condition for Step 1. (1) 4.1.2 Write down the NAME or FORMULA of the INORGANIC productformed in Step 1. (1) 4.1.3 Name the TYPE of substitution reaction represented by Step 2. (1) 4.1.4 Write down the NAME or FORMULA … Read more
Learners use compounds A, B and C to investigate one of the factors that influencesthe VAPOUR PRESSURE of organic compounds. 3.1 Define the term vapour pressure. (2) 3.2 Write down the independent variable for this investigation. (1) 3.3 Which compound, A or B, has the higher vapour pressure? (1) 3.4 Fully explain the answer to … Read more
The letters A to F in the table below represent six organic compounds. 2.1 Write down the LETTER(S) that represent(s) the following: 2.1.1 A ketone (1) 2.1.2 TWO compounds that are FUNCTIONAL ISOMERS (1) 2.1.3 A hydrocarbon (1) 2.2 For compound D, write down the: 2.2.1 Homologous series to which it belongs (1) 2.2.2 IUPAC … Read more
1.1 Which ONE of the following compounds has hydrogen bonds betweenmolecules?A. PentanalB. Pentan-2-oneC. Pentanoic acidD. Methyl butanoate (2) 1.2 To which homologous series does a compound with molecular formulaC6H12O2 belong?A. KetonesB. AlcoholsC. AldehydesD. Carboxylic acids (2) 1.3 Which functional groups are involved in the formation of esters?A. Formyl and carbonylB. Hydroxyl and carbonylC. Hydroxyl and … Read more
1.1 A constant net force acts on an object moving in a straight line. Which ONE ofthe following quantities associated with the object will remain constant duringthe motion?A. VelocityB. MomentumC. AccelerationD. Kinetic energy (2) 1.2 The weight of an object on the surface of the Earth is w. What will be theweight of the object … Read more