Evidence for Chemical Reactions

1. Name 3 of the 5 evidences.

2. Name for OF2

3. Formula for Tin II Sulfide

What is the difference between a chemical

change and a physical change? • Physical

– Alters ________– Alters __________– Does not make

_______________

Examples:

• Chemical– Bonds ______ and

new bonds _______– ______________

formed

Examples:

Chemical or Physical Change?

Chemical or Physical Change?

What five pieces of evidence indicate a chemical change?

• 1.

• 2.

• 3.

• 4.

• 5.

What are some observations made in the discovery?

1.

2.

3.

4.

5.

Demonstrations: What evidence of a chemical reaction is occuring?

• Barium hydroxide + ammonium nitrate

Demonstrations: What evidence of a chemical reaction is occuring?

• Silver nitrate + sodium chloride

Demonstrations: What evidence of a chemical reaction is occuring?

What information does a chemical equation contain?

• Reactants ____ Products• Reactants ____________ Products• Reactants ____ Products• The _________ separates the reactants on the

left from the products on the right of the equation.

• The __________ separates the individual reactants and individual products on each side of the equation.

Examples

Iron + Oxygen → Iron (III) oxide

Hydrogen peroxide → Water + oxygen

Methane + oxygen → Carbon dioxide + water

What does the principle of conservation of mass state?

• Matter is not created or destroyed, only _____________.

• All ___________ at the start of a reaction are present at the end.

• Remember, in a chemical reaction, _________ are not created or destroyed; they are simply prearranged / deranged /

rearranged / homeontherange.