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February 25
- 1. Conservation of Mass February 26th, 2013
- 2. Agenda 1) Warm-up -15min 2) Set up C-notes and Vocabulary cards – 15 min 3) Candle demonstration and Questions – 20 min 4) Conservation of Mass Activity – 30 min 5) Notes & answer FQ – 20 min No homework
- 3. Warm-up Please answer thesequestions on the next blank page in your notebook 1) What is a physical change? 2) What is a chemical change? 3) Give one example of a physical change and one example of a chemical change
- 4. Set up yournotebooks Please set up your C-notes for today (next blank page) Topic: Conservation of Mass Focus Question: Where do the atoms in the products of a chemical reaction come from?
- 5. Vocabulary Mr. Lee willnow show you how to set up your vocabulary cards
- 6. Demonstration Observe the demonstration given by Mr. Lee and fill out your worksheet as you go along.
- 7. Physical Change As we have learned before, in a physical change, a new substance is not formed. Ex: When ice turns into liquid water, and then into gas, the substance is still water. No new substances are formed.
- 8. Chemical Change In achemical change, atoms in the reactants will rearrange and form new bonds, creating products that are new substances. The process by which a chemical change occurs is called a chemical reaction.
- 9. In most chemicalreactions, two or more substances (reactants) interact to create different substances called products. Let's see a demonstration..
- 10. A chemical reactionkeeps the candle burning. What are the reactants in the chemical reaction? Oxygen and Wax
- 11. What are theproducts in the chemical reaction? Carbon dioxide and water vapor
- 12. What do youthink will happen if a jar is placed over the candle? Why did the flame go out? Where does the wax go? Does it disappear?
- 13. Wax is madeof long polymers called paraffin. Paraffin is a hydrocarbon, which means it is a molecule consisting of only Carbon and Hydrogen. The simplest hydrocarbon is Methane (CH4). We will use methane to demonstrate how any hydrocarbon burns.
- 14. Burning hydrocarbons Answerthese questions with your elbow partner. 1) What are the molecules on the left side of the arrow called? The right side? 2) How many Carbon, Oxygen, and Hydrogen atoms are on the left side of the arrow? 3) Where do the atoms on the right side of the arrow come from?
- 15. You will nowmake a model to show how atoms in the reactants rearrange to form the products You will have twenty minutes to complete this activity
- 16. Notes Reactants are substancesyou start with that interact and form new substances. Products are the new substances that are produced from a chemical reaction A chemical equation shows reactants forming products by an arrow →
- 17. The Law ofConservation of Mass states that atoms cannot be created or destroyed. The atoms in the reactants rearrange and form new bonds to form the molecules in the products. This means you're breathing in the same oxygen atoms as Einstein did!
- 18. Answer Focus Question FocusQuestion: Where do the atoms in the products of a chemical reaction come from?
- 19. Agenda: February 27th Today we will review chemical reactions and physical vs chemical change then find out what are the common signs that a chemical reaction has occurred as we prep for our lab on Friday Copy only the agenda below 1) Define Chemical Reaction 2) Chemical vs Physical Change 3) 6 Signs of Reactions 4) Vinegar & Baking Soda!
- 20. Today we willreview chemical reactions and physical vs chemical change and find out what are the common signs that a chemical reaction has occurred!
- 21. Please write thesein the Cornell notes you set up yesterday The common signs that a reaction has occurred are: (the sense used is listed in parentheses) 1) Change of color (sight) 2) Change in temperature (touch) 3) Flash of light (sight) 4) Sound (hear) 5) Formation of bubbles (gas) (sight) 6) Formation of a precipitate (sight) We will define precipitate later in our unit.
- 22.