Changes in Shape
A physical change is...
A change in some properties of matter
True or False?
The temperature of an object is one of its PHYSICAL PROPERTIES.
TRUE
Give an example of when a liquid becomes a solid...
Water to ice
cream to ice cream
juice to a popsicle
Evaporation happens when...
True or False...
A physical change forms a different kind of matter.
False
The object can feel colder or warmer and might cause it to change it's shape.
Slow down
When particles evaporate they are moving....
UPWARD
How can you tell that a physical change does not make a new substance?
The properties of the substance are the same before and after the change.
How does a cold temperature effect food?
It can cause a food to freeze.
A solid will melt...
ice to water
ice cream to cream
popsicle to juice
Give an example of Evaporation...
Puddles disappearing from the ground
Clouds forming as water vapor
Water disappearing from a pot of boiling water
Give an example of a physical change that you might see with food.
Fruit sliced vs. whole
Ice cream vs. melted
cream vs. whipped cream
Give an example of how warming the air could effect the weather.
It could:
Make the sidewalk very hot
Cause snow to melt
What is the definition of a freezing point and a melting point?
Freezing point: When a liquid becomes a solid
Melting point- When a solid becomes a liquid
The temperature at which evaporations occurs is called...
The Boiling Point
Why is cutting paper an example of a physical change?
It is still paper but in a different form.
How might information about the effects of hot and cold air be useful on a cold morning when you want to ride your bike.
I might have to add more air in my tires
I might have to dress warmer
The melting point of water is 32 degrees F. Do you think the Freezing point is the same temp?
Yes they are the same...
Anything above 32 degrees is melting
Anything below is freezing
How can you use melting and boiling points to identify a substance?