Conservation of Mass

Chapter 16.2page 660-665

What does this say?

“U Wn2 gt pza 2nite?”

What about this: “No. MaB TPM. CUL8R.”

Chemical Equation Like texting, chemical equations are a

shorter, easier way to describe a chemical reaction.

Chemical equations use chemical formulas and other symbols instead of words to summarize a reaction.

Products and Reactants A chemical formula shows what you

start with and what you get from a chemical reaction.

The substances you have at the beginning are called reactants.

After the reaction, the substances you have left are the products.

The reactants are what you have at the ________ of a chemical reaction.

A) StartB) EndC) Equal D) Look like

The products are what you have at the ________ of a chemical reaction.

A) StartB) EndC) Middle

What are the reactants in this chemical equation?

H2 + Cl2 2HCl

a)H2

b)Cl2

c)2HCl

d)H2 + Cl2

What are the reactants in this chemical equation?

A) Methane and Oxygen

B) MethaneC) Carbon

dioxideD) Carbon

dioxide and water

Methane + Oxygen Carbon Dioxide + Water

CH4 + 2O2 CO2 + 2H2O

What are the reactants in this equation?

2H2 + O2 2H2O

a)2H2

b)2H2 + O2

c)2H2O

d)O2

What are the products in this chemical equation?

a) H2

b) Cl2

c) 2HCl

d) H2 + Cl2

H2 + Cl2 2HCl

What are the products in this chemical equation?

A) Methane and Oxygen

B) MethaneC) Carbon

dioxideD) Carbon

dioxide and water

CH4 + 2O2 CO2 + 2H2O

Methane + Oxygen Carbon Dioxide + Water

What are the products in this equation?

a) 2H2

b) 2H2 + O2

c) 2H2O

d) O2

2H2 + O2 2H2O

Conservation of Mass

Matter is not created or destroyed during a chemical reaction.

Conservation of Mass

The total mass of the reactants equals the total mass of the products.

In the demonstration with vinegar and baking soda, what are the reactants?CH3CO2H + NaHCO3 ---> CH3CO2Na + H2O +

CO2

A) VinegarB) Baking sodaC) Vinegar and

Baking SodaD) Carbon Dioxide

In the demonstration with ice melting, what is the product?

A) IceB) WaterC) Ice and waterD) Carbon dioxide

The law of conservation of mass states: “Matter is neither created or ______ in a chemical reaction.”

A) SeenB) DestroyedC) ConsumedD) Used

If the mass of the reactants in a chemical reactions is 156 g, what is the mass of the products?

A) 156 gB) 200 gC) 0 gD) 78 g

If I start with ice water that has a mass of 22 g and the ice melts, what should be the mass of the water that is left?A) 18 gB) 94 gC) 88 gD) 22 g