Notes

Tennessee SPI Objective:Identify the common outcome of

all chemical changes.

Science

Essential LearningStudents will examine chemical change outcomes to determine common results.

Essential Question(s)How do I recognize that a chemical change hasoccurred, and what are the common outcomes of chemical reactions?

SPI 0807.9.2 Chemical Change Outcomes

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Chemical ChangesOccur when 2 or more substances, due to a chemical reaction, form a compound & change into a new substance.Compounds are formed when you combine 2 or more or more different reactive elementsAtomic bonds break apart and new atomic bonds are formedValence Electrons are transferred or shared(F.Y.I. This is called ionic & covalent bonding)

….so in other words chemical changes, chemical bonding and chemical reactions are all connectedChemical bonding occurs during a chemical reaction resulting in a chemical change

SPI 0807.9.2 Chemical Change OutcomesNotes Science

Just F.Y.I. Chemical Reaction due to Ionic Bonding

-bond formed by electron transfer ("stealing")-forms a compound called NaCl (table salt)

Notes Just F.Y.I 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)

5 Key Points About All 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 during chemical reactions4) Atomic bonds are broken and new bonds are formed (at the valence electron level) 5) compounds come from chemical reactions

SPI 0807.9.2 Chemical Change OutcomesNotes Science

Chemical Change Indicators-Memory Trick

H.O.P.E.H: Heat-Heat may be given off (it may get hot)O: Odor-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)

SPI 0807.9.2 Chemical Change OutcomesNotes Science

Memory TrickChemical reactions can H.O.P.E.

Chemical Change Indicators-Memory Trick

4FPCF: 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.)

SPI 0807.9.2 Chemical Change OutcomesNotes Science

Memory TrickChemical reactions can 4FPC

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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