Tiêu đề CHE JR ST M 09 OBJ LEVEL 01(26 May 2016).ppt ✅

STOICHIOMETRY
Stoichiometry Objective Level – I
1) The total mass of reactants is always equal to the total mass of products in a chemical reaction. “This statement is known as” a) Law of conservation of mass b) Law of definite proportions c) Law of equivalent weights d) Law of combining masses Laws of chemical combination
2) Which of the following is the best example of law of conservation of energy a) 12gm of carbon combines with 32 gm of oxygen to form 44 gm of CO2 b) When 72 gm of carbon is heated in vaccume and no change in mass takes place c) The weight of a piece of platinum is the same before and after heating air d) 2 gm of hydrogen combines with 32 gm