Chemical Change Lesson 9 Compare Physical Change and Chemical Change. Describe evidence of Chemical Change.

Prior Knowledge What examples of Physical Change have you observed? What examples of Physical Change have you observed? How do you know that something has had a Physical Change? How do you know that something has had a Physical Change? What do apples turning brown, bread rising in the oven, cars rusting, and fireworks have in common? What do apples turning brown, bread rising in the oven, cars rusting, and fireworks have in common?

Demonstrations Burning Paper Burning Paper - Is this a physical or chemical change? - How do you know? -What is your evidence. Melting Ice Melting Ice - Is this a physical or chemical change? - How do you know? -How does your understanding of phase change make you think that?

Investigation Burning Candle Predict what you think will happen. Predict what you think will happen. Is this a physical or chemical change? Is this a physical or chemical change? What substances are involved in the burning candle? What substances are involved in the burning candle? Do you think any new substances are produced by the burning? Do you think any new substances are produced by the burning? What will happen when you place the glass jar over the burning candle? What will happen when you place the glass jar over the burning candle?

Equipment Candle Candle Foil Foil Goggles Goggles Glass Jar Glass Jar Water Water Science Journal Science Journal Complete your observations before placing your jar over the candle.

Explanation In a chemical change or Chemical Reaction one or more substances called reactants, interact to create different substances called products. In a chemical change or Chemical Reaction one or more substances called reactants, interact to create different substances called products. 1. What were the reactants in our investigation of the burning candle? Explain why you think that. 2. What were the products?

Let’s Break It Down! Reactants: Reactants: - Wax (Carbon, Hydrogen) - Wax (Carbon, Hydrogen) - Oxygen - Oxygen Products: Products: - Carbon Dioxide - Carbon Dioxide - Water Vapor (H2O) - Water Vapor (H2O)

Another Chemical Reaction When we eat food, we “burn” food in our bodies by a chemical reaction called Cellular Respiration and produce carbon dioxide and water. When we eat food, we “burn” food in our bodies by a chemical reaction called Cellular Respiration and produce carbon dioxide and water. Combustion Combustion C 24 H O 2 25CO H 2 O + ENERGY C 24 H O 2 25CO H 2 O + ENERGY C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + ENERGY

Wrap Up COMPARE COMPARE Physical ChangeChemical Change Physical ChangeChemical Change Substance remains the same. It can be undone. Substance does not remain the same. It can’t be undone.

Journal Entry In your investigation and observations of the candle burning, a glass jar was placed over the candle. Describe what happened to the flame and how that provides evidence for identifying one of the reactants in the burning candle.

Chemical Change Lesson 10 How do scientists know that Carbon Dioxide and water are products of candle burning? What are the reactants and products of candle burning and how do they balance to show that nothing was lost or gained in the burning?

Energy Chemical Reaction Video 20min.