States of Matter
Phase Changes
Dissolving
Mixtures
Physical and Chemical Changes
100
Particles have the least amount of energy
Solids
100
In order to get matter to change states, what must you do?
Add or remove heat (energy)
100
True or false: When you dissolve sugar in water, the sugar molecules are destroyed.
False
100
What is the difference between a pure substance and mixture?
Pure substance: all the same atoms or molecules
Mixture: a variety of atoms or molecules
100
Atoms and molecules are broken down and new ones are created in a _____ change
Chemical
200
Indefinite shape, indefinite volume
Gases
200
Heat is added to a solid
Melting
200
Name the 3 things you can do to increase the rate of dissolving
Stir
Add Heat
Smaller solute particles
200
Water
Pure substance
200
Cutting up a piece of paper
Physical
300
Definite volume, but not a definite shape
Liquids
300
During freezing, does the attraction between the molecules increase or decrease?
Increase
300
True or false: adding more solute to the solvent will help it dissolve faster
False
300
Milk
Mixture
300
2 clear liquids combine and turn blue
Chemical
400
Particles have the strongest attraction to each other
Solids
400
Heat is removed from a gas
Condensation
400
I dissolve 20g of salt into 170g of water to make a salt water solution. What is the mass of my solution?
190g
400
Tea
Mixture
400
Heating up milk for a baby
Physical
500
Take the shape of their container (2)
Liquids and Gases
500
A cup of ice has a mass of 95g. When the ice melts, what will the mass be?
95g
500
When you dissolve a solute into a solvent, you are creating a _____ mixture
Homogeneous
500
Which is the pure substance?
#2
500
Name 3 of the 5 indicators of a chemical change
temperature change
odor change
precipitate
formation of gas (bubbles)
unexpected color change