Law of Conservation of Matter (Mass)

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

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

LOCM Lab Demo

Lego Demonstration Law of Conservation Video

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.

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.

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

Let’s Practice Counting Atoms NaOH Na - 1 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

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

Mass of Reactants = Mass of Products Reactants Products Mass of Reactants = Mass of Products

Chemical reactions are represented on paper by chemical equations.

Works Cited http://www.iun.edu/~cpanhd/C101webnotes/matter-and-energy/masscons.html http://wine1.sb.fsu.edu/chm1045/notes/Stoich/Equation/Stoich01.htm

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

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

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

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

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

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

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