Compounds, Chemical Formulas, and Chemical Equations.

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Presentation transcript:

Compounds, Chemical Formulas, and Chemical Equations

Prior Knowledge Recall our study of elements on the periodic table.

Period Table of the Elements

Link what you know to something new Let’s Compare Elements and compounds

ElementsCompounds Pure One type of atomTwo or more atoms chemically combine together Can be separated by nuclear reactions Can be separated by chemical reactions Examples: gold, silver, aluminum Examples: water, carbon dioxide, sodium chloride

Salt water, rust

Hydrogen Peroxide Use to cleanse a cut or scrape on your skin H 2 O 2 me.htm

Compound Two or more elements combined chemically.

Sometimes elements or compounds chemically combine. This can be show using chemical formulas and chemical equations.

Examples of Chemical Formulas and Equations CO 2 + H 2 O = (H 2 CO 3 ) Carbon dioxide + water = carbonic acid (soda fizz) Ag + S = Ag 2 S Silver + sulfur = sulfur sulfide (tarnish)

When you take the cap off a bottle of soda, bubbles rise to the top of the bottle as carbonic acid breaks down into carbon dioxide and water.

Tarnished Silver

Chemical formula Scientific short way of describing the chemical content of a substance. Number and letters stand for how many and what kinds of atoms are in one molecule of the chemical. For example: In CO2, the C stands for carbon and the O stands for Oxygen. There are two atoms of oxygen and one atom of hydrogen.

Chemical Equation Is a statement that uses chemical formulas to express the identities and quantities of the substances involved in a chemical or physical change

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Explain Review vocabulary Provide examples of compounds, chemical formulas and chemical equations Relevance

 Elaborate So Happy Together!

 Evaluate 1. In a molecule of fruit sugar, C6H12O6, how many carbon atom are there? Hydrogen? Oxygen? 2. Which formulas represent compounds? Elements? (NaCl, Ag, Co, CO, SO2, AgBr) 3. Nitrogen in the air is two nitrogen atoms attached together, N2. Is this nitrogen a compound or element? How do you know?

4. How many molecules of copper are produced from two molecules of Cu2O? 5. What happens to atoms in a chemical reaction? 6. What physical properties can change in a chemical reaction?