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Vocabulary
Physical Change
Chemical Change
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Picture
100
Physical Change
When matter changes to look different but does not change matter.
100
This physical change is when you are trying to make room in a bag full of cans.
What is crushing.
100
Compare how a chemical change is different than a physical change.
It is permanent.
100
At what point does a solid change into a liquid
melting point
100
This is a picture of what kind of change?
physical change bonus why?
200
What does chemical change mean?
the change of matter to form a new substance with new properties.
200
What three physical changes happen to water?
boil, melting, and freezing
200
Give me 4 signs that a chemical change has occured
possible answers: gas forming heat is given or absorbed solid forms or disappears new colors can occur a NEW odor is created light is produced
200
How can we speed up the evaporation process?
get the heat source closer.
200
What could cause a jar of milk to do this?
power outage, left out of fridge, weeks passed the expiration
300
What is evaporation
physical change of a matter from a liquid to a gas
300
Describe to me the boiling point, melting point, and freezing point of water.
boiling point is when water begins to boil = 212 degrees f Freezing point is when water starts to freeze = 32 degrees f melting point is when the temperature is too warm to be frozen but not too hot to make the water boil = between 32 and 212 degrees
300
for rust to occur what three things do you need.
Iron + water + oxygen = rust ( plus a little time)
300
I have a bonfire, we are looking at the homework from school and it ends up in the fire. I wait until the fire is done to try and get it back. Can I?
no, there is no way to take the ash of the paper back to the paper it was before it went into the fire.
300
why is there water on the rose petals?
condensation, the cooler air temperature changes the water vapor in the air and the water collects on the rose.
400
What is condensation?
The physical change of matter from a gas to a liquid
400
Explain to me how clouds are formed by condensation.
water evaporates into the atmosphere. When the water vapor reaches a higher elevation the temperature lowers and the vapors stick to dust particles in the air.
400
I leave my gallon of milk on the counter while I am on vacation for a week without the lid. How do I know that a chemical change has occurred?
answers will vary
400
cooking an egg. Physical or chemical change? why?
Chemical. the old egg will never go back to the original color, texture, or smell.
400
What has given the statue of liberty this green color?
The copper on the statue of liberty has had a chemical reaction with the oxygen to change its color. Bonus: why does the statue still look so amazing?
500
What is a hypothesis?
A statement about the outcome of an inquiry that can be tested.
500
When you see that the level of water in a lake has changed, what has caused this change?
The heat source (sun) has cause evaporation over time to lower the water level. It is a long process
500
at what temperature does fire start (on wood)
300 degree f
500
Why do some water bottles have wet cold slippery outsides compared to others? What causes that cold slimy feel ?
the condensation on the outside of the water bottle depends on the insulation of the bottle. The more cold let out of the bottle the more the water vapor in the air will want to change to liquid on the bottle.
500
looking the three surfaces create a hypothesis about what you could do for a science experiment.
Answers will vary