Notes Tennessee SPI Objective: Identify the common outcome of all chemical changes. Science Check for Understanding Make a table or concept map which includes the common outcomes of chemical reactions. Essential Question(s) 1) How do I recognize that a chemical change has occurred? 2) What are the common outcomes of chemical reactions? SPI Chemical Change Outcomes Instructions for Students 1) Make sure you view this presentation in slideshow mode. 2) You can find instructions about how to do this by doing a Google search or by searching YouTube. 3) After you have it in slideshow mode, press the right-arrow keyboard button to advance through the presentation. 4) If you need help, please communicate with your teacher.

5 Key Points About Chemical Reactions: 1) A new substance is created 2) The properties of the new substance are different from the substances that you started with 3) No atoms are created or destroyed in chem reactions  (In other words, no mass is created or destroyed!) 4) Atomic bonds are broken and new bonds are formed  (at the valence electron level) 5) compounds form during chemical reactions SPI Chemical Change Outcomes Notes Science A Chemical Change  Is the result of a chemical reaction  Can not be easily undone or reversed Video Link: Chemical ChangesChemical Changes

Chemical Change Indicators-Memory Trick H: Heat-Heat may be given off (it may get hot) O: Odor/gas-There may be a change in odor (how it smells) P: Pop-It may pop or bang (make a loud noise) E: Explode-It may explode (like fire crackers or dynamite) S: Sound- Noise (snap, crackle, pop, whistle, sizzle, bang, boom) R: Rust- Any form of rust is a slow chemical reaction SPI Chemical Change Outcomes Notes Science Memory Trick H.O.P.E.S.R.

Chemical Change Indicators-Memory Trick F: Foam-It may foam (like vinegar & baking soda) F: Flash-It may flash (like a grenade or gun powder) F: Fizzle-It may fizzle (make a hissing sound like Alka-Seltzer) F: Flame- It may burn (like burning paper or wood) P: Precipitate-It may form a solid substance (called a precipitate) C: Color- It may change color (red to blue, green to orange, etc.) C: Cold- It may become cool or cold C: Corrosion- It may corrode (rust) C: Compounds- It can form a compound G: Gas- Gas may be released (may smell different) SPI Chemical Change Outcomes Science Memory Trick 4FP4CG

Chemical Bonds  Atomic bonds break apart and new atomic bonds are formed  Valence electrons are transferred or shared F.Y.I. This is called ionic or covalent bonding ….so in other words SPI Chemical Change Outcomes Notes Science Video Link (3 min 33 sec): How Atoms BondHow Atoms Bond  Chemical bonding occurs during a chemical reaction resulting in a chemical change  chemical changes, chemical bonding and chemical reactions are all connected.

F.Y.I. Example: chemical reaction due to ionic bonding -bond formed by electron transfer ("stealing") -forms a compound called NaCl (table salt)

F.Y.I Example: chemical reaction due to covalent bonding -bond formed by sharing of electrons -Forms a diatomic molecule called N 2

Compounds  Compounds are formed from chemical reactions Example: When two hydrogen atoms react with one oxygen atom you produce (form) the compound called water (H 2 O). H Oxygen H H H SPI Chemical Change Outcomes Notes Science Memory Trick C = C (chemical reactions = compounds)

Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test. Questions Science Sample Question SPI Chemical Change Outcomes