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Chemical and Physical Change
Chemistry C4-C5 Graphs Chemical and Physical Change Chemical vs. Physical On the Molecular Level ??? 10 20 30 40 50 1
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Here is a graph of water cooling. Where is it ice?
B C D E 5 10 15 20 Minutes A B C D E
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Where is the water partially liquid and partially solid?
B C D E 5 10 15 20 Minutes A B C D E
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Where on the graph is the water experiencing a phase change?
B C D E 5 10 15 20 Minutes A, C, E B, C B, D A, B, C
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At what temperature is the freezing point?
B C D E 5 10 15 20 Minutes 120 0C 100 0C 0 0C -20 0C
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About how long did the phase change from liquid to solid take?
5 10 15 20 Minutes 5 minutes 4 minutes 10 minutes 20 minutes
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Which are indicators of chemical change?
Melting, producing a gas, producing a smell Giving off light, giving off heat, evaporating Melting, evaporating, freezing Produces a smell, produces a color change, produces a gas
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What is a physical change?
A change that does not alter the identity of the substance A viewable change resulting in something new A change that alters the identity of the substance A change in the atoms in the molecules of the substance
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Which are indicators of physical change?
Melting, freezing, giving off light Freezing, evaporating, melting Evaporating, giving off heat, giving off smell Giving off light, giving off smell, giving off heat
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What is a chemical change?
A change that does not alter the identity of the substance A mixing of two or more compounds A change that alters the identity of the substance A change in the state of the substance
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You mix 2 clear liquids and get a pink liquid. Which is true?
You’ve formed a mixture so it is only a physical change You’ve formed a new chemical compound, so it’s a chemical change You’ve formed a new chemical compound, so it’s a physical change It is both a physical change and a chemical change
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Freezing grapes Physical Change Chemical Change
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Rusting Physical Change Chemical Change
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A cut healing Physical Change Chemical Change
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Metamorphosis of a butterfly
Physical Change Chemical Change
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Squeezing oranges for orange juice
Physical Change Chemical Change
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If you warm up a solid and it remains solid…
Molecules moving freely will move faster Molecules vibrating will begin to move freely Molecules vibrating will vibrate faster Solids don’t move at all
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If you cool a liquid so that it freezes…
Molecules moving freely will move slower until they cannot move freely and only vibrate Molecules vibrating will begin to vibrate less Molecules moving freely will stop moving Molecules moving very quickly will slow down but still be able to move around each other
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Energy going into a partially melted substance…
Increases the temperature Decreases the temperature Breaks bonds causing the substance to change chemically Breaks bonds causing the molecules to be able to move more freely
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Energy leaving a partially melted substance…
Allows bonds to form causing the substance to change chemically Decreases the temperature Allows molecules to group together and form bonds Increases the temperature
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Which picture represents the molecules melting
1 Choice One Choice Two Choice Three Choice Four 2 3 4
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Which picture represents the molecules subliming
1 Choice One Choice Two Choice Three Choice Four 2 3 4
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Which picture represents the molecules vaporizing
1 Choice One Choice Two Choice Three Choice Four 2 3 4
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A dandelion growing is…
A physical change because it’s still the same thing A chemical change because it’s changing size A physical change because it’s changing size A chemical change because it’s changing molecules into something new
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What is it called when a gas goes to a solid?
Condensation Vaporization Sublimation Deposition
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What is the boiling point of water? (What temperature)
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Boiling water causes bubbles to appear. What gas is in those bubbles?
Double Jeopardy Boiling water causes bubbles to appear. What gas is in those bubbles? 27
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