1.8 Consider the balanced chemical equation: 2H2(g) + O2(g)

QUESTION 8 An essential amino acid Lysine has a molar mass of 146,19 g.mol-1and a percentage composition as follows: 49,29 % C; 9,66 % H; 19,16 % N and21,89% O. 8.1 Define the term empirical formula (2) 8.2 Determine the molecular formula (8)           [10]

1.1 Which of the following is an example of a molecular solid at room temperature?   (2)

QUESTION 7 Study part of a reaction between 15 g of iron and 25 g of chlorine gas, taking place in a closed container: The product formed is iron(iii)cloride Fe(s) + Cl2(g)

QUESTION 9 After dissolving 5 g of NaOH in distilled water, a 250 cm3 solution is formed.   In the reaction below 20 cm3 of the formed NaOH solution neutralises 30 cm3 of H2SO4 solution. 2NaOH + H2SO4

1.4 Which of the statements are CORRECT of a molecule with a large binding length?   (2)

1.9 Consider 25 cm3 of HCl with concentration of 2 mol.dm-3. What volume of water is needed to reduce the concentration to 1,2 mol.dm-3?     (2)

QUESTION 5 The table below shows the melting points of hydrogen halides. Study the table and answer the questions that follow: Right click on the following button to open the TABLE in a seperate tab. 5.1 Distinguish between the terms intramolecular bonds and intermolecular forces.   (2) 5.2 Represent the data in the table on a graph.  (6) 5.3 Which intermolecular forces are present in hydrogen chloride?   (1) 5.4 Identify the hydrogen halide that will require the least amount of energy to reach melting point? Motivate your answer.     (3)           [12]

VRAAG 9 Nadat 5g NaOH opgelos is in gedistilleerde water, is ’n 250cm3 oplossing gevorm. In die onderstaande reaksie het 20cm3 van die oplossing, 30 cm3 van ’n H2SO4 oplossing geneutraliseer. 2NaOH + H2SO4

VRAAG 6 Twee kristallyne vastestowwe P, en Q het smeltpunte van 710 o C en 723 o C onderskeidelik.  By 700 o C kan P elektriesiteit gelei, maar nie Q nie. By 750 o C gelei albei elektrisiteit. 6.1 Wat kan ons aflei van die smeltpunte oor die relatiewe kragte wat daar bestaan tussen die deelttjies in P en Q? (2) 6.2 Verduidelik die verskil in elektriese geleidingsvermoeë tussen P en Q. (4) 6.3 Jy word gesê dat een van die stowwe is Barium en die ander is Kalium jodiet. Watter een is watter een? (2) 6.4 Wat is die verskil tussen kovalente en ioniese verbindings? (2) 6.5 Noem 5 verskillende tipes intermolukelêre kragte. (5)           [15]