Notes

Tennessee SPI Objective:Identify the common outcome of

all chemical changes.

Science

Check for UnderstandingMake a table or concept map which includes thecommon outcomes of chemical reactions.

Essential Question(s)1) How do I recognize that a chemical change hasoccurred?2) What are the common outcomes of chemicalreactions?

SPI 0807.9.2 Chemical Change Outcomes

Instructions for Students1) 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 with3) 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 0807.9.2 Chemical Change OutcomesNotes Science

A Chemical Change Is the result of a chemical reaction Can not be easily undone or reversed

Video Link: Chemical Changes

Chemical Change Indicators-Memory TrickH: 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 0807.9.2 Chemical Change OutcomesNotes Science

Memory TrickH.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 coldC: Corrosion- It may corrode (rust)C: Compounds- It can form a compoundG: Gas- Gas may be released (may smell different)

SPI 0807.9.2 Chemical Change Outcomes ScienceMemory Trick

4FP4CG

Chemical BondsAtomic bonds break apart and new atomic bonds are formedValence electrons are transferred or sharedF.Y.I. This is called ionic or covalent bonding

….so in other words

SPI 0807.9.2 Chemical Change OutcomesNotes Science

Video Link (3 min 33 sec): How 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 N2

Compounds Compounds are formed from chemical reactions

Example: When two hydrogen atoms react with one oxygen atom you produce (form) the compound called water (H2O).

HOxygen

HOxygen

H

H

SPI 0807.9.2 Chemical Change OutcomesNotes 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 0807.9.2 Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.2 Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.2 Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.2 Chemical Change Outcomes

Here is an example of a question you might see on a quiz or test.

Questions Science

Sample Question

SPI 0807.9.2 Chemical Change Outcomes