+ Chapter 8: Lesson 2 Chemical Equations. + Learning Objectives Today’s Objective: SWBAT: Distinguish among elements, compounds, and molecules.

+

Chapter 8: Lesson 2

Chemical Equations

+Learning Objectives

Today’s Objective: SWBAT: Distinguish among elements,

compounds, and molecules.

+Elements, Compounds, and Molecules

+Elements

• Consist of only 1 type of element

• Symbols for the elements are found on the periodic table

+Diatomic Molecules

• Neutral particles in which elements share electrons

Diatomic = “two” atoms

• These molecules have two atoms of the same element.

• Remember: HNOFClBrI

• H2, N2, O2, F2, Cl2, Br2, I2

+Compounds

Compounds are composed of 2 or more different atoms.

H2O: water is a covalent compound

NaCl: salt is an ionic compound {Formula Unit}

+Learning Objective - Preview

Determine how a chemical reaction satisfies the law of conservation of mass.

+Law of Conservation of Mass

Mass Before = Mass After

Mass of reactants = Mass of Products

Figure 9 page 346

+Word Equations:

Tin + Oxygen Gas Tin Oxide

Reactants:

“produces”

Product:

+Word Equations:


Reactants: tin, and oxygen gas

“produces”

Product: tin oxide

+

Sodium bicarbonate + acetic acid

water + carbon dioxide + sodium acetate

How many Reactants are there?

Word Equations:Random Selection… be ready!

+



How many Products are there?


+



Product or Reactant?

Acetic acid


+




Carbon dioxide


+




Water


+




Sodium bicarbonate


+




Sodium acetate


+Word Equations: Are they good enough?


Quick Write:

Does this equation prove the Law of Conservation of Mass?

Why or Why Not?

+Chemical Reactions:Whiteboards


C + O2 CO2


H2O2 H2O + O2


CH4 + 2O2 CO2 + 2H2O


C + O2 CO2

+ Chapter 8: Lesson 2 Chemical Equations. + Learning Objectives Today’s Objective: SWBAT: Distinguish among elements, compounds, and molecules.

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