![]() While this demonstration shows a physical change, remind students that acids and enzymes help to further break down food which is a chemical change. Students should observe that the food in the bag that has muscle contractions will break down more than the other bag. What are 5 examples of chemical changes Burning of paper and log of wood. Some, but not all physical changes can be reversed. A change is more likely to be irreversible if there is a reaction such as a fizz, color change, or a change in temperature. What are 5 examples of physical change Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending. Put the bags down, have students make observations, wait another five minutes and repeat. For example, when vinegar is mixed with baking soda, the two fizz and a new substance is formed. Often, this is a classroom demonstration, so I will call students up to squeeze the bag to resemble stomach muscles. Allow the bags to remain as they are.Īfter 5 minutes, mimic the stomach muscles moving to break down the food. ![]() For example, this experiment will mimic how the muscles of our bodies help to break down food in the human body to be digested.įill the same types of food inside each bag trying to keep them as similar as possible. Some chemical reactions produce a precipitate. ![]() Reinforce the concept that science happens in our bodies, including physical and chemical changes. The figure below shows some of the signs that a chemical reaction is happening.
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