In Science Class . . . Week of 10/24

This week, 4/5 students will be continuing their study of chemical reactions. Last week, we learned that chemical reactions occur when two or more substances mix together and their atoms rearrange into new configurations (producing new substances). This week, we will look more closely at the combination of calcium chloride, water and baking soda and use a indicator (red cabbage juice) that will react to create a number of color changes. On Thursday, I'll be at a science training, so students will be watching a Bill Nye video on chemical reactions with the substitute.

• What kind of evidence tells you that a chemical reaction has taken place? (production of gas, color change, temperature change)
• What are some examples of fast chemical reactions? (Anything burning is a chemical reaction)
• What are some examples of changes that are not chemical reactions? (Phase changes, like melting or boiling)