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)

TOTAL FOR PAPER:

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

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)          

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)