Physical vs Chemical
Cutting an apple in half
Physical change
What are the three states of matter?
Solid, liquid, and gas
What is an example of a chemical reaction that you see everyday?
(answers vary)
How many O are in H2O?
1
Two chemicals are mixed together to form a new substance
Chemical change
Give an example of a solid that will melt if you leave it in the sun?
(answers vary)
Heat, light, smell, color...
How many N are in
CHN3
3
A bicycle starts to rust and turns a different color
Chemical change
When you heat to a gas will the molecules move faster or slower?
Faster
What two elements make up water (H2O)
Hydrogen and water
How many S are in 4CaS ?
4
Water from a puddle has evaporated into the air
Physical change
What is it called when a liquid turns into a gas?
Evaporation
If we have a campfire and we are roasting marshmallows, what is an example of a chemical reaction taking place?
Answers vary
How many atoms for each element are in 2SHO3
H = 2
O = 6
True of False: Acid rain damaging a marble statue and fireworks exploding in the air are both chemical changes
Draw on the board, what the molecules look like when it is in a liquid phase
(board drawing)
In a chemical reaction equation, what does the ARROW mean?
yield
How many for each element are 4 Al2(SO3)3
Al = 8
S= 12
O = 36