Author: Anonymous

1.10 The mass (in grams) of 7,25 dm3 of O2 gas at STP is:   (2)

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]

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

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