PS1+(3-4)+-+2


 * Students demonstrate an understanding of states of matter by** …

2a describing properties of solids, liquids, and __gases__.

2b identifying and comparing solids, liquids, and __gases__.

2c making logical predictions about the changes in the state of matter when __adding or taking away heat (e.g., ice melting, water boiling or freezing, condensation/evaporation).__

What misconceptions are students likely to have about these topics?

 * Gases are not substances.

What phenomena and representations help students understand these topics?

 * To provide evidence that gases are substances, the carbon dioxide fire extinguisher demonstration calls for the teacher to use baking soda and vinegar to produce CO2 that can be poured to extinguish burning candles:
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