BACHELOR OF SCIENCE Study Guide - Midterm Guide: Magnesium Oxide, Chemical Equation, Sodium Chloride
7 May 2023
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Chemical reaction : whenever a chemical change occurs we can say that a chemical reaction has taken place eg food gets digested in our body. Chemical equation : a chemical reaction can be expressed symbolically by using chemical equation eg magnesium is burnt into air to form magnesium oxide can be represented as. We can observe or recognise a chemical reaction by observing change in state, colour, by evolution of gas or by change in temperature. Physical state of the reactant and products are mentioned to make chemical reaction more informative. eg we use (g) for gas, (l) for liquid, (s) for solid and (aq) for aqueous. Combination reaction : the reaction in which two or more substances combine to form a new single substance. Ca(oh)2 slaked lime is used for white washing walls. It reacts will co2 to form caco3 and gives a shiny finish to the walls.
