States of Matter
Name the 3 states of matter.
Solids
Liquids
Gases
According to the law of conservation of mass, mass is never ____________ or ___________ it just changes ________________.
lost
gained
form
Give three examples of mixtures.
Answers will vary.
Give three examples of a chemical change
Answers will vary
Is a candle burning a physical or chemical change or both?
Both
The wick burning is a chemical change, but the wax melting is a physical change.
Why does an ice cube melt at room temperature?
The temperature of the ice increases because the ice absorbs heat from somewhere in its surroundings.
Explain the difference between weight and mass on the moon.
If you go to the moon, your weight will change because the pull of gravity also changes. Your mass will remain the same.
What is it called when one substance completely dissolves in another substance?
a solution
Describe the difference between a physical change and a chemical change.
In a physical change, the chemical properties of a substance do not change and it can be returned to its original state. In a chemical change, the chemical properties of a substance changes and it can not be reversed.
What type of matter is an icicle?
solid form of water
At an object’s boiling point, a ___________ changes to a ____________
At an object’s freezing point, a ___________ changes to a ____________
use: Solid, Liquid, or Gas
At an object’s boiling point, a liquid changes to a gas.
At an object’s freezing point, a liquid changes to a solid.
Mr. Tourdot crushes a can of soda. What has changed about the can? (one answer correct)
a. Its shape
b. Its mass
c. Its weight
d. Its shape and weight
A. Its shape
Why is a solution like saltwater considered a physical change and not a chemical change?
The chemical properties of the salt and the water do not change when they are mixed together. The solution can also be separated.
Name three clues that point to the fact that a chemical change has occurred.
1.Change in color
2.Change in texture
3.Bubbles and gas are released
What two types of matter make up a helium balloon floating in the air?
gas and solid
Explain how matter moves from a solid, to a liquid, to a gas.
In order to move from a solid to a liquid, the temperature of matter needs to increase. To move from a liquid to a gas, the temperature needs to increase even more. This causes the particles to move faster.
Name two ways to measure volume.
1.Length x Width x Height
2.Water Displacement
Describe how to separate a solution of Kool-Aid and water.
You can boil the solution. When the water evaporates, the Kool-Aid crystals will be left behind.
Describe how you can cause both a physical change and a chemical change to a ham sandwich with cheese.
Physical Change: you can remove parts of the sandwich that you do not like to eat.
Chemical Change: you can toast the sandwich
Other answers may be acceptable
Describe a physical change that happens while roasting a smore over a campfire.
The physical change is the graham crackers mixing with the marshmallow or a chocolate piece melting.
Explain how condensation occurs
When the temperature drops (like on a glass with ice), gas particles in the air slow down and turn back into a liquid.
Is solubility a physical or chemical property?
physical property
Describe the steps that you would take to separate a mixture of:
Water, Salt, Iron filings, Rocks, and Sand
1.Pick out the rocks with your hand
2.Use a magnet to take out the iron filings
3.Use a filter to remove the sand
4.Boil the water in order to turn it into a gas
5.The salt will be left behind
Explain why dying your hair is a chemical change and not a physical change.
When you dye your hair, you are using chemicals to alter the color of your hair. The only way to reverse it is to allow your hair to grow back.
Describe a chemical change that occurs in a s'more being roasted over a campfire AND evidence that it is a chemical change.
The chemical change is the burnt marshmallow. That is a new type of matter. And the evidence is a color change, texture change and smoke.