Cool Chemistry Lab For Your Home School Science Curriculum [sciencetechnology-center.blogspot.com]
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Chemistry makes a very interesting subject for a home school science curriculum, as it deals with the reaction between two substances, change of colors, and the production of heat, light and sound energy.
We see change all around us such as boiling of an egg, the popping of pop corn, the ripening of bananas, the baking of muffins, the burning of firewood, the bursting of a cracker, the tearing of a paper sheet, the lighting up of a match stick, the rotting of garbage, the rolling of dough, etc. Some changes are desirable, whereas others are unpleasant. Some of the above-mentioned changes are physical whereas some are chemical changes.
You will learn in your home school science curriculum that there are two types of changes: physical and chemical changes.
A physical change is a change in which the substance may look different, but it is the same substance. For example, when you tear a sheet of paper, the end result is pieces of paper, but it is still paper.
A chemical change is when the atoms within the molecules get rearranged to form a different substance. Also there is change of color and energy is either given out (exothermic) or absorbed (endothermic). For example, when you burn paper, the molecules that paper is made up of undergo a change and you get solid ash and gaseous molecules of carbon dioxide and carbon monoxide.
How does one tell whether a change is a physical one or chemical one?
I'll give you Some Simple Tips.
It is a chemical change if:
There is a change in the color A new substance is formed A precipitate is formed A gas (bubbles) is released Energy is released in the form of heat, light and sound (exothermic) and the substance gets hot Energy is absorbed (endothermic) and the substance becomes coldDo This Now!
Your Home Chemistry Lab The Lab Setup: You will require a sturdy table (a granite countertop is great). Cover the table with a plastic tablecloth. On the table place some small bottles with various liquids or powders (reactants), measuring spoons and muffin cups (instead of test tubes).
Materials: Water, rubbing alcohol, vinegar (acetic acid), citric acid (from your grocery store), clear dish liquid (Ivory), hydrogen peroxide, washing soda (sodium carbonate), baking soda (sodium bicarbonate), salt (sodium chloride), sugar, cream of tartar (grocery store), etc.
Objective: To determine which reactions are chemical changes and which ones are physical changes (tips, above).
Procedure: Take the muffin cups and mix two or more liquids and/ or powders and see what happens. Touch the cups and feel for a rise or fall in temperature. Initially you can mix anything you want.
Precaution: Although these materials are safe for activities of a home school science curriculum, they may cause dry and itchy skin and sore eyes. So wear gloves and protective goggles.
Try the following combinations and write your observations: Citric acid + water + baking soda Baking soda + vinegar Baking soda + water Salt + water + liquid soap Sugar + water Salt + water Sugar + salt + water Citric acid + liquid soap Washing soda + Vinegar Baking soda + cream of tartar Vinegar + water
You will be amazed at the color changes, bubbling sounds and heat production. Enjoy!
Chemistry was never so much fun, was it? Check out the free "Home school Parent's Guide to Teaching Science", for great science experiments and activities by clicking the link below.
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