Chemical Reaction is defined as transforming one chemical substance into another chemical substance. In a chemical reaction, new material is produced with properties utterly different from the original one, resulting in a chemical change. For instance: rusting of iron, curdling of milk, food digestion, breathing, and so on.
For example: O2 + 2Mg(s) gives Magnesium Oxide (MgO). MgO is a mineral that is found in the solid state. The magnesium ribbon is cleaned with sandpaper before being burned in the air. This is done to remove the basic magnesium carbonate protective layer from the magnesium ribbon's surface.
Gas evolution: The chemical interaction that involves zinc and dilute sulfuric acid is characterized by hydrogen gas evolution.
Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g) ZnSO4(aq) + H2(g)
Color Change: When citric acid reacts with the purple-colored potassium permanganate, the color of the solution changes from the color purple to no color.
A change in orange to green characterizes the chemical interaction involving sulfur dioxide gas and acidified potassium dichromate solution.
Change in substance state: The reaction of candle wax combustion is considered a transition from the state of solid to liquid and then a gaseous state.
Temperature change: The chemical reaction involving fast lime water and slaked lime is characterized by a temperature change (a temperature rise). A temperature shift is also present in the chemical reaction involving zinc granules and dilute sulfuric acid (a temperature rise).
Precipitation: The reaction of sulfuric acid and barium chloride solution results in a white barium sulfate precipitate.
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