Chemical or Physical?
You make a fruit smoothie.
Physical Change
What are the reactants?
SnO2 + H2→ Sn+ H2O
SnO2 + H2
CH4 + O2 → CO2 + H2O
CH4 + 2O2 → CO2 + 2H2O
What's the most important part of science ?
Safety
You rip up your Science Test.
Physical Change
What are the products ?
SnO2 + H2→ Sn+ H2O
Sn+ H2O
SnO2 + H2→ Sn+ H2O
SnO2 + 2H2→ Sn+ 2H2O
This type of reaction gives off energy in the form of temperature increase.
Exothermic
You burn your Science Test.
Chemical Change
How many Carbon atoms are in the following compound?
C6H12O6
6
Fe + Cl2 → FeCl3
2Fe + 3Cl2 → 2FeCl3
Name 2 things that can affect the rate of a reaction.
Temperature, Surface Area, Concentration, Catalysts, or Inhibitors...
An apple rots at the bottom of your locker.
Chemical Change
How many Oxygen atoms are in the compound below?
4H2O2
8
NH3 + O2 → NO + H2O
4NH3 + 5O2 → 4NO + 6H2O
This is when a solid forms from a solution.
Precipitate
Your small intestine digests your breakfast to give you energy.
Chemical Change
What does the Law of Conservation of Mass state?
Mass is neither created or destroyed in chemical reactions. It just changes form...
KOH+ H3PO4 → K3PO4 + H2O
3KOH+ H3PO4 → K3PO4 + 3H2O
These substances can increase a reaction rate.
Catalysts
List 4 evidences of chemical reactions.
Color change, Odor, Light/Heat, Gas or Bubbles form, Precipitate forms