Worksheet : Chemical Reaction and Chemical Equations
Worksheet: 1. Translate the following statements into chemical equations and then balance there: (a) Aluminium metal replaces iron from ferric oxide giving Aluminium oxide and iron. (b) Phosphorus burns in oxygen to form phosphorus pentoxide. (c) Carbon disulphide burns in air to give carbon dioxide and Sulphur dioxide. (d) Hydrogen sulphide burns in air to give water and Sulphur dioxide. 2. Give the values of x and y by balancing: (a) xKNO3-------------->yKNO2 + O2 (b) xHCl +O2-------------> yH2O +2Cl2 (c) xKClO3---------------> KCl + O2 (d) xAl + H2SO4------------> Al2(SO4)2 + H2 3. Complete the statement: (a) Balanced chemical equations satisfy the law of ..................................... (b) The reactions in which two or more substances combine together and form one compound is called.......... 4. How will you indicate the following effects in the chemical equation: (a) Formation of a precipitate (b) Evolution of a gas 5. What does the symbol(aq) represent