# States Of Matter: Identifying Solids, Liquids, and Gases

Students will be able to differentiate between a solid, liquid, and gas. Students will be able to give examples of changes in states of matter from heating and cooling.

(5 minutes)
• Tell your students that they will be learning about the states of matter.
• Explain that everything in our lives is made up of matter. It includes the air we breathe, the clothes we wear, the books we read, the food we eat, etc.
• Ask them if they know what the 3 states of matter are.
• List the three states of matter on the board.
(30 minutes)
• Define the word MoleculeBy explaining that molecules are what is in all matter. Molecules are the smallest possible amount of a substance.
• Explain to your students that a SolidIs something that keeps its own shape because the molecules are packed tightly together. Have your students come up with examples, and write them on the board. Offer examples, such as desks, books, and chairs.
• Remind your students that a LiquidIs something that doesn't have its own shape because the molecules are more loosely packed together. Liquids take the shape of whatever container they are put in. Some examples include water and juice. Ask your students to come up with additional examples of liquids. List them on the board.
• Explain to your students that a GasHas no particular shape because the molecules are spaced apart and move around freely. They move around and can fit any container they're put in. Tell your students that air is made of gases, and share that gas usually can't be seen.
• Pose the following question: Can a solid turn into a liquid? Give students time to think, pair with a partner to discuss, and then share with the whole group.
• Explain that a cube of ice can turn into a liquid with heat. Place a cube of ice in warm water, and have your students observe it for 5 minutes. Show your students how the ice is starting to melt.
• Ask your students if a liquid can turn into a gas. Have them think, pair with a partner to discuss, and share with the whole group. Then, demonstrate the change in the state of matter by placing a glass of water in a microwave. Set the microwave to 3 minutes. Take out the cup and show students that the bubbles formed on top of the water consist of gas.
(10 minutes)
• Ask your students to complete the Solid, Liquid, Gas worksheet with a partner.
• Go over the worksheet as a class.
(20 minutes)
• Ask your students to complete the What is Solid?, What is Liquid?, and What is Gas? worksheets.
• Go over these worksheets with your students.
• Enrichment:Instruct your students to research what would happen to their body without liquids. Have them come up with two facts in their own words. Direct your students to find out the different gases that make up the air and their roles. Ask your students to research and explain 2 things that would happen to the Earth if it weren't solid.
• Support:Instruct your students to complete the Drawing Solids, Liquids, and Gases worksheet. Help them come up with examples for each state. This worksheet will give students a visual about the three different categories.
(5 minutes)
• Ask your students to give an example of a time when a solid can change into a liquid.
• Have them explain when a liquid can change into a gas.
• Instruct them to write down the answers on a sheet of paper.
(10 minutes)
• Go around the class, and ask your students to give an example of a solid and a liquid.
• Tell your students that for a gas, they can describe a process that consists of releasing gas such as breathing or burping. Alternatively, give an example of a gas found in the air such as oxygen or nitrogen.

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