1. CHEMICAL REACTION NOTES

2. Essential Question: How do chemical reactions change the items I use?

3. Chemical Reactions
Are examples of a chemical change (new material is created)
Occurs when two or more substances react to create a new material.
In a chemical reaction the atoms are rearranged into a new pattern forming a new molecule or substances.
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4. Modeling Chemical Reactions
2H2 + O2 → 2 H2O
CH4 + 2O2 → CO2 + 2 H2O

5. Indicators or clues to a chemical reaction
Bubbling or Fizzing (gas is produced)
A solid is formed (precipitate)
Heat is produced (exothermic reaction)
Drop in temperature (endothermic reaction)
Light is produced (fire or fireworks)
Sound is produced (explosion)
Sometimes a color change

6. Chemical Equations
Explains a chemical reaction using symbols to explain what happens.
CuCl3 + Al → AlCl3 + Cu
NaOH + HCl → NaCl + H2O
Those substances on the left of the arrow are called the reactants
Those substances on the right of the arrow are called the products
produce
Reactants → Products

7. Parts to a Chemical Equation
H2O2(l) + NaOCl(l) → NaCl(aq) + H2O(l) + O2(g)
Reactants produces Products
Yields
Forms
(aq) – solid dissolved in water
(s) – solid
(cr) – crystal solid
(l) – liquid
(g) - gas

8. Law of Conservation of Matter/Mass
Matter can not be created or destroyed it can only change form.
The mass of the reactants is equal to the mass of the products
The number and type of atoms in the products is equal to the number and type of atoms in the reactants.
NaOH + HCl → NaCl + H2O
Wood O2 → ash + soot + smoke