Changes in States
True/False: Matter Can Change
TRUE
What is all matter made of?
Molecules
What does it mean when there is a physical change?
Matter has changed size, shape or form
What is a chemical change?
a process that changes substances into new substances
What is a change of state?
The process of changing one form of matter into another form of matter with different characteristics
Compared to ice, how do molecules of water behave?
How can you change a gas to a liquid?
Take away heat
How can you change water into water vapor?
By boiling it
Which term best described the two substances that react to form salt?
Toxic
What does it mean to melt?
to change a solid to a liquid
What do water vapor, liquid water, and ice have in common?
The same chemical properties
What is it called when a solid turns directly into a gas?
Sublimation
Do molecules move more quickly or slowly as they cool?
More slowly
When do chemical reactions happen?
When atoms gain, lose, or share electrons
What does it mean to boil?
to change state from a liquid to a gas
What's the easiest way to add energy to matter?
Heating It
What effect does taking away heat have on water?
The molecules move slower and slower and the water freezes
What is a physical change?
a change in matter that does not affect its chemical composition
Why are chemical changes different from physical changes?
-A new substance is formed
-They cannot be easily undone
-They release energy or absorb it
What does it mean to freeze?
to change a substance from liquid to solid by lowering its temperature
The melting point of H2O is 0 degrees Celsius. This is the same as its:
Freezing Point
Rank the Kinetic Energy in the states of Matter from the highest to the lowest
-Liquid
-Solid
Give 3 examples of Physical Changes
Answers Vary
Give 3 examples of Chemical Changes
Answers Vary
What is evaporation?
the process in which matter changes from a liquid to a gas