Author: Anonymous

TOTAL FOR PAPER: [125]

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