Physical and Chemical Changes
Are all physical changes easy to change back?
No
What are the three states of matter? (In the correct order)
Solids, liquids and gases
What did Tim use to cook his bread?
A toaster
What is something that freezes at room temperature?
Candle wax
What holiday is coming up in 2 weeks?
Dragon Boat Festival
Why is ice melting or water boiling a physical change?
Because the matter stays H2O
What do you see when water is boiling to tell you it is changing state?
bubbles
Cooking bread is a physical change because it becomes hot and what?
Crunchy
What is the range of room temperature?
20º-30º
What is the Chinese Zodiac animal next year?
Sheep
Toasting, cooking and burning are all chemical changes. Why is this?
The fire changes the matter into ash and smoke
cooks the food into something new
changes the matter
After a long, rainy day, there is a lot of water on the ground. When the warm sun comes out and turns it into a gas, what is this called?
Evaporation
Tim made a physical change to oranges to make orange juice. He did three things to the orange, what were they?
Squeeze, squish and flatten
What do you call the stuff on a candle that melts?
Wax
Taiwan's old name is called "Formosa". What country gave it this name and what does it mean?
Portugal
Beautiful
Cutting something is a physical change, but it is very hard to change something you cut back to one piece. So why is this a physical change?
Because the matter stays the same
What do you call the change from gas -> liquid that you can see on windows and water bottles
Condensation
Tim observed a chemical change: rust, what did this happen to?
His tricycle
There is really a 4th state of matter (This will not be on your exam). What is it?
Plasma
Look at this map, if you want to fly from Taiwan -> America, what is the fastest way to fly there and why?
Taiwan, Over Japan, past Alaska and Canada, to the US.
Because the world is round, not flat
What temperature does gold melt? Is this a physical or chemical change?
Over 1,000ºC
Physical
What is the difference between boiling and evaporating?
Boiling is hot and quick
What is the dark, brown color of rusted metal called?
Tarnish
What is the temperature (in Fahrenheit) for freezing and boiling water?
32ºF and 212ºF
What is the name of the last official emperor of the Qing Dynasty (清朝)
Puyi (溥儀/宣統帝)