Synthesis and evaluation. Key Concepts: There are five signs of a chemical change: 1. Color Change 2. Production of an odor 3. Change of Temperature 4. Evolution of a gas formation of bubbles 5. Precipitate formation of a solid Vocabulary: 1. Chemical properties 2. Chemical change 3. This activity would be appropriate for just a few students up to as many as The only limitation would be desk space and graduated cylinders.
Everything else can be obtained from a grocery store. The lab is inquiry and it can be used to introduce the concepts of chemical change. It can also be used to demonstrate the chemical changes of color and bubbles.
It is a lab that takes approximatelu minutes of class time to do. It will also require minutes for recording observations and answering questions, as well as additional time for set up and clean up.
The time required for these, would depend on the number of children doing the lab. It can be done individually or in groups of two. If necessary, it can be done with larger groups, but it is much more fun with 1 or two students. The only special equipment that will be needed are graduated cylinders.
It is helpful if students have studied physical changes, but not necessary. This lab can be used as an anticipatory set, or as an example s of chemical changes in materials. The children can do the lab and then learn why the changes took place, or they can use it to demonstrate learned concepts. Scratching a key across a desk. Making a sand castle. Answer B. Shattering glass with a baseball.
Corroding metal. Fireworks exploding. Lighting a match. Baking a cake. Solution Shattering glass with a baseball results in glass broken into many pieces but no chemical change happens, so the answer is A. Frying an egg. Slicing carrots. A Macbook falling out of a window. Question 19eb9. Question e2ea2.
Question bc Question e2ea6. Question 08b What is the thermochemical equation for the combustion of benzene? Why are chemical reactions reversible? Why are chemical reactions important?
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