Chemical Reactions, and Chemical Equations

1. Chemical Reactions, and Chemical Equations By: Ryan Bach, Robert Abrams, Mohamed Aly

2. What is a Chemical Reaction? • Chemical Reaction- The changing of other substances by breaking old bond to form new bonds • All reactions, whether simple or complex, desirable, or undesirable, involve changing substances. • Chemical Reactions happen everyday • Digesting Food • Photosynthesis

3. Writing Chemical Reactions • With every chemical reaction there will be a reactant and a product • Reactant: The starting substance • Product: The substance that is formed

4. ∆ Symbols Used In Equations + is used to separate two products or reactants → “Yields,” separates reactants from products = An alternative to → ↔ Used in place of a → for reversible reactions (s) In the solid state (l) In the liquid state (aq) dissolved in water (g) In the gas state Indicates that heat is supplied to the reaction

5. Barium+ Oxygen → Barium Oxide • What is the product of the reaction? • A.) Oxygen • B.) Barium Oxide • C.)Barium • D.) Barium + Oxygen

6. What Is A Skeleton Equation? • A Skeleton Equation is a chemical equation that is not balanced. • A skeleton equation is just a way of using the formulas to indicate the chemicals that were involved in the chemical reaction.

7. What is a Catalyst? • A Catalyst is a substance that speeds up a reaction without being used up. • For example, in the lab that we conducted Manganese Dioxide was the Catalyst.

8. Sodium+ Oxygen → Sodium Oxide • What Would The Skeleton Equation Be? • A.)Na + O2 → Na2O • B.)2Na +O2 → Na2O • C.)Na + O → Na2O • D.)Na +O2 → NaO

9. Facts • In a chemical reaction, substances lose their characteristic properties. • In some chemical reactions, such as that of photographic film, light is an important factor.

10. Homework Question: • What Does Iron + Oxygen yield? What is the Skeleton Equation for the reaction?(Hint: There is more than one possible, correct product here.)