Law of Conservation of Matter (Mass)

WARM-UP ACTIVITY 10/8/15

• Write 3 things you think about when you see or hear the word

CONSERVATION

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 + 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

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

Reactants ProductsMass 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/Stoic

h/Equation/Stoich01.htm

TRUE OR FALSE• A. CH4 + 2 O2 1 CO2 + 2 H2O

C = C =

H = H =

O = O =

•.

True or False• B. 2 H2O + 1 O2 2 H2O

• H = H =• O = O =

True or False• C. P + 5 O2 2 P2O5

P = P =

O = O =

True or False

• D. 2 C8H18 + 25 O2 16 CO2 + 18 H2O

C = C =

H = H =

O = O =

TRUE OR FALSE• A. TRUE• B. FALSE• C. FALSE• D. TRUE

Exit Ticket-Balanced or NotShow Work

• 1) N2 + 3H2 NH3

• 2) 2KClO3 KCl + 3O2

•  • 3) NaCl + F2 2 NaF + Cl2•  • 4) 2 H2 + O2 2H2O