1.7 Sodium chloride (NaCl) is a solid which is soluble in water. Which one of the following describes the intermolecular forces that exist between sodium chloride and water in solution?         (2)

1.6 The bond in the H2O molecule is described as polar covalent because:   (2)

QUESTION 3 Consider a hydronium ion (H3O+). 3.1 Draw the Lewis structure of H3O+. (3) 3.2 Identify the shape of H3O+. (1) 3.3 Use the VSEPR to explain the shape mentioned in QUESTION 3.2 (2) 3.4 Explain what is meant by a dative covalent bond. (2)           [8]

1.3 Which of the following are the types of forces of attraction between non-polar molecules?   (2)

1.2 Choose the molecule with a trigonal pyramidal shape: (2)

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)