31.   Fanshawe clearly thought that Quigley was the product of the chemical reaction he had just engendered.

32.   In chemical reactions where gases are evolved the volume of gas can be measured using a suitable gas syringe at selected time intervals.

33.   Most chemical reactions which proceed at a measurable rate are believed to take place in a series of simple steps.

34.   For most chemical reactions the rate of reaction is much slower than the collision frequency so you must assume only a small fraction of collisions result in a reaction.

35.   Stoichiometry is the study of the quantitative composition of chemical substances and also the quantitative changes that take place during chemical reactions.

36.   During chemical reactions, one or more substances change their chemical composition to form one or more new substances.

37.   Thus Reactants Products The composition of chemical compounds and the changes in composition that take place during chemical reactions are governed by four important laws.

38.   This law states that matter cannot be created or destroyed in a chemical reaction.

39.   The mass of product formed in a chemical reaction is called the yield.

40.   Chemical reactions which do not produce quantitative yields are sometimes called non-stoichiometric processes.