Middle school
Chemical changes, physical changes, reactions
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Explosions are the best part of any chemistry activity, but how do they happen? What changes occur to create them? This activity dives into physical and chemical changes by having students observe different reactions at home. Students will be introduced to reaction examples like mentos and coke, yeast and hydrogen peroxide, and more!
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Students will know
- The common examples of physical change
- The common indicators of chemical change
- Mixing acetic acid and sodium bicarbonate is a chemical change
- Hot ice is a physical change that uses a chemical change product.
Students will understand
- Appearance or form of matter changes in a physical change, but not the kind of matter in a substance
- Kind of matter changes in a chemical change and at least one new product or substance with new properties is formed
- That nothing is lost from the original substances in a chemical reaction
Students will be able to
- Precisely measure and mix acetic acid and sodium bicarbonate in a sandwich bag to create two new products.
- Use common examples of physical and chemical change to identify whether a new reaction is a physical or chemical change, and cite evidence in support.
- Create hot ice
Next Generation Science Standards Connections
MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
MS-PS1-5. Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
Texas Essential Knowledge and Skills Connections
6.5(C). Identify the formation of a new substance by using the evidence of a possible chemical change such as production of a gas, change in temperature, production of a precipitate, or color change.
7.6. The student knows that matter has physical and chemical properties and can undergo physical and chemical changes. The student is expected to distinguish between physical and chemical changes in matter.
8.5(E). Investigate how evidence of chemical reactions indicates that new substances with different properties are formed and how that relates to the law of conservation of mass.
Louisiana Standards for Science Connections
7-MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
7-MS-PS1-5. Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.