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Science - 1st Grade
Standard 3 Objective 2
1 class periods of 60 minutes each
Students observe the differences between solids, liquids and gases. They sort different liquids as to their physical properties. Finally, they observe how food coloring mixes in water, club soda, and salt water.
Matter comes in three forms: solid, liquid and gas. Solids maintain their own shape. Liquids flow and take the shape of their container. Gases are mostly empty space and will diffuse to take the shape of their surroundings. The diagram attached illustrates the amount of empty space in the three states of matter .
Liquids can be sorted based on their physical properties. Liquids can differ in color, viscosity or thickness, how clear they are, and other qualities.
Plain and salt water have different densities. Food coloring will sink in plain water because it is denser but will float on salt water because it is less dense. In club soda, food coloring will diffuse quickly because the carbonation bubbles help mix the food coloring. Overtime, the food coloring will diffuse throughout all three of the water-based solutions.
Pre-lab Discussion: Show the students the diagram above. Using water for the example: use ice as the solid, a cup of water for the liquid, and have water boiling to show steam as the gas. Discuss how all three substances are water and that they only differ as to what form they are in.
I. Students will classify a group of liquids by observing their physical appearance.
II. Students will watch how a drop of food coloring moves differently in plain water, salt water and club soda.
Rio Tinto Hands-on Science Curriculum Team