1. CHEMICAL REACTIONS

2. The Basics Reactants Products
_________ are the starting materials for a chemical reaction.
Reactants
_________ are the new chemicals that are made in the reaction.
Products
Together, the reactants and the products make a ________ ________.
chemical reaction
Reactants
Products

3. Parts of an equation:
reactants – (everything before the arrow) products – (everything after the arrow)
ex:
2H2 + O H2O reactants products

4. CHEMICAL REACTION – _______ that changes one or more _________ into one or more _________________
process
substances
NEW SUBSTANCES

5. signs that show a chemical reaction has occurred:
1. A _______________ change occurs
permanent color
___ is produced
(could be bubbles or an odor!)
Gas

6. precipitate light liquid solid 3. Gives off ______
4. Forms a ____________ (a ______ is formed from a _______)
liquid
solid

7. 5. An ____________ or ___________ reaction occurs
endothermic
exothermic
(A Change in Temperature occurs !)
absorbs
Endothermic – ________ heat (feels _____)
cold
Exothermic – __________ heat (feels ____)
releases
hot

8. The Symbols… Symbol What it means… +  (s) (l) (g) (aq)
Used to separate 2 reactants or 2 products 
Yields or becomes
(s)
Substance is in the solid phase
(l)
Substance is in the liquid phase
(g)
Substance is in the gas phase
(aq)
Solution is aqueous (dissolved in water)