What happened to heat energy in the reaction? (thermic-of or pertaining to heat)

Endothermic• Endo-from the Greek meaning

innerEnergy is absorbed and held in during this type of reaction.

Chemistry in a bag experiments

Exothermic

• Exo-from the Greek meaning outerEnergy is released and given off during this type of reaction.

Chemistry in a bag experiments

Types of chemical reactions

4 types

Chemical equationa short easy way to show a chemical reaction, using symbols instead of words

2Cu + O 2 ---- 2CuOREACTANTS PRODUCTS

2H202 ---- 2H2O + O2 REACTANTS PRODUCTS

4 types of chemical reactions

• 1) Synthesis reaction-• 2 or more simpler substances combining to produce a more complex

substance

2) Decomposition Reaction

2H202 ----------- 2H2O + O2 REACTANT PRODUCTS

3) Replacement ReactionWhen on element replaces another in a compound OR when 2 elements

in different compounds trade places

Metals lab ( a single replacement experiment) Mg + HCl---------- Mg Cl + H2

The Mg replaced the Hydrogen and formed a new chemical bond with Chlorine. Hydrogen went back to being a gas. We proved it was H gas by using the wood splint test.

4. Double Replacement