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Vraag 1 Verslag
In the reaction 2H2S(g) + SO2(g) → 2H2SO(I)+3S(s)SO2is acting as _agent
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Vraag 5 Verslag
Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass
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Vraag 6 Verslag
At s.t.p, a mole of chlorine occupies 22.4dm3. If the temperature is changed to 35°C and the pressure to 750mHg the of the new volume will be [Cl = 35.5]
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Vraag 7 Verslag
The boiling point of water is higher than the boiling point of ethanol because
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Vraag 8 Verslag
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
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Vraag 9 Verslag
Which separation technique is routinely applied in the petroleum industry?
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Vraag 11 Verslag
Which formula is used to indicate the degree of acidity of an acid?
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Vraag 12 Verslag
The number of hydrogen ions in 1.0dm6.00x103 of a 0.25 mole dm6.00x10-3 tetraoxosulphate(Vl) acid solution is
[Avogadro constant = 6.0 x 1 0]
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Vraag 13 Verslag
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
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Vraag 14 Verslag
What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution?
The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]
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Vraag 15 Verslag
What change will occur during the electrolysis of brine using carbon electrodes?
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Vraag 16 Verslag
What is the change in the oxidation number of phosphorus in the following reaction?
4P(s) + 5O2(ag) → 2P2O5(s)
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Vraag 17 Verslag
Which hydrocarbon does NOT exhibit structural isomerism?
Vraag 19 Verslag
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?
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Vraag 20 Verslag
An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.
What is the empirical formula of the compound? [C = 12, H = 1, Br=80]
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Vraag 21 Verslag
An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?
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Vraag 22 Verslag
Which statement is NOT true about the composition of starch?
Vraag 23 Verslag
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
Vraag 25 Verslag
What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?
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Vraag 26 Verslag
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
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Vraag 27 Verslag
Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is
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Vraag 28 Verslag
What is the IUPAC name of CH3CCI=C(CH3)2?
Vraag 31 Verslag
What is the number of moles of NaHCO3in 250cm3 of its solution if the solution contains 8.4 g of NaHCO3 in 1 dm3 of the solution. [Na = 23, 0 = 16, C = 12, H = 1)
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Vraag 33 Verslag
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
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Vraag 34 Verslag
What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]
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Vraag 35 Verslag
Which is NOT a synthetic polymer?
Vraag 36 Verslag
What is the concentration (in mol dm3) of a solution containing 28 g of potassium hydroxide per 100 cm3 of solution? (K=39; H=1; 0=16)
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Vraag 37 Verslag
The reaction C2H6 → C2H + H2 is known as
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