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)          

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)

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

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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)          

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)