Fridaymarch22nd
Transcript of Fridaymarch22nd
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Agenda: Friday, March 22nd
1) Warm-up – 10 min2) Coefficients review – 20 min3) Chemical Change Review – 20 min4) Open-Note Quiz – 30 min
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Answer the 3 CST questions the same way we did on Tuesday: Write down your answer, key words, and reason you chose the answer.
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Sometimes a change seems irreversible when it is.
For example, when dry ice sublimates, can we reverse it?
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Yes we can!Dry ice undergoes deposition at -78 degrees
Celsius. If we decrease the temperature below that, Carbon Dioxide gas will re-form into dry ice
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If we recycle a can and it gets crushed in order to make something else.. is it a chemical change because it changed into something else?
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No! Because even though the can gets changed into something else, the aluminum molecules in
the can do not get changed.
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What is an example of a chemical change to a table?
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In a chemical change the molecules in the table would react and form other molecules, such as carbon dioxide gas and ash (made of carbon).
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Chemical and Physical Changes
Definition of a Chemical change:1) Substance changes its identity2) Irreversible3) New molecules are formed
Definition of a Physical change:1) Substance changes appearance, not identity2) Reversible3) Same molecules after change as before4) All phase transitions
Draw 2 examples of each type of change – 20 pts
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Mini poster
With a sheet of paper, create a mini foldable for a chemical and physical change. Mr. Lee will
demonstrate.
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Coefficients and Chemical Changes
Read pages
and answer questions
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Quiz: Open Notes
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