Some examples of physical changes12/7/2023 Students could also learn about the computational concept of inputs and outputs by identifying the inputs of a chemical reaction (e.g., baking soda and vinegar) with the outputs of the reaction (e.g., gas bubbles). Refer to this guide to better understand how students could do this. Students could use Scratch to practice coding skills by sorting images into physical and chemical changes.For example, if bubbles form then it is a chemical reaction, or if it melts then it is a chemical change. Conditional statements give rules to direct the flow of what happens, such as if something is true, then something will happen or else something else will happen. Have students write conditional statements for identifying if a change is physical or chemical.Breaking, crumpling, or molding matter also results in a physical change. These include melting, boiling, vaporization, freezing, sublimation and deposition. Students could create a poem or rap in which they define and give examples of physical and chemical changes. The size or shape of matter often changes, but there is no chemical reaction.Assure students that the symbols help us know how to safely use and dispose of the products so there is no harm to us or to the environment. You could bring in empty containers bearing these symbols and discuss with students what they think the symbols might mean and why they are placed on these products. Students may wish to explore the meaning of these international symbols that give us information on the safety of substances. For example, they could consider weather-related situations such as when rain turns to sleet or freezing rain.
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