1. Law of Conservation of Matter (Mass)

2. LOCM/Harry Potter Video
What does the Law of Conservation of Matter State? 2.
3. How does the video contradict what we know about the LOCM? Use your data to support your answer.
Weight
Mass
Avg. Cat
Prof. McGonagall

3. Prof. McGonagall Avg. Cat
255.6 kg 5
Avg. Cat
24.4 kg

4. LOCM Lab Demo

5. Lego Demonstration
Law of Conservation Video

6. LAW OF CONSERVATION OF MATTER
Matter can neither be created nor destroyed in a chemical reaction.
In a chemical reaction, there are the same numbers and types of atoms before and after the reaction.

7. LAW OF CONSERVATION OF MATTER
EX: Formation of Water
The chemical reaction is written in an equation that looks like this:
2 𝐻 2 + 𝑂 2  2 𝐻 2 O
The items on the left side of the arrow are called reactants and the items on the right side of the arrow are called products.

8. CHEMICAL COMPOUNDS
Check the numbers and types of atoms on each side of the arrow.
Reactants Product
2 Hydrogen molecules Two molecules of water
(each molecule has two (each molecule has two
Hydrogen) = total of 4 hydrogen and one oxygen)
+ for a total of 4 hydrogen and
One oxygen molecule 2 oxygen
(each molecule has two
Oxygen) = total of 2

9. Let’s Practice Counting Atoms
NaOH
Na O-1 H-1
Na 𝐶 2 𝐻 3 𝑂 2
Na-1 C-2 H-3 O-2
4 HN 𝑂 3
H – 4 N – 4 O - 12
3 𝐴𝑙 2 𝑂 3
Al – 6 O - 9

10. CHECK IT OUT!! Identify the numbers and types of atoms below:
CaCO3  CaO + CO2
One calcium, one carbon, and three oxygen atoms on each side

11. Mass of Reactants = Mass of Products
Reactants Products
Mass of Reactants = Mass of Products

13. Chemical reactions are represented on paper by
chemical equations.

23. Works Cited

24. Balanced or NOT? A. CH4 + 2 O2  1 CO2 + 2 H2O C = C = H = H = O = O =

25. Balanced or Not?
B. 2 H2O + 1 O2  2 H2O
H = H =
O = O =

26. Balanced or Not
C. P + 5 O2  2 P2O5
P = P =
O = O =

27. Balanced or Not?
A. Balanced
B. Not Balanced
C. Not Balanced

28. Exit Ticket-Balanced or Not Show Work
1) N2 + 3H2  NH3
2) 2KClO3  KCl + 3O2
3) NaCl + F2  2 NaF + Cl2
4) 2 H2 + O2  2H2O

29. Exit Ticket-Balanced or Not Show Work
1) N2 + 3H2  NH3
2) 2KClO3  KCl + 3O2
3) NaCl + F2  2 NaF + Cl2
4) 2 H2 + O2  2H2O

30. Law on Conservation of Matter (Mass) Demo
Law of Conservation Demo