Warm-Up What is a chemical reaction? List the 5 types of chemical reactions.

Chemical Reactions

What is a Chemical Reaction? Scientific Definition: A process in which physical and chemical properties of the original substance change as existing bonds are broken and new bonds are formed, producing new substances with different physical and chemical properties. Simple Definition: A process that forms one or more new substances

Evidence of Chemical Reactions Change in temperature Unexpected change in color Change in odor Formation of a precipitate Formation of a gas

Chemical Equation Vocab Reactant – substance that is consumed Product – substance that is formed Catalyst – substance that speeds up a reaction, but is NOT consumed Coefficient – number that shows how many molecules of a substance are consumed or produced Physical State – symbol showing the state of matter of each substance in the reaction (s) = solid (l) = liquid (g) = gas (aq) = aqueous (dissolved in water)

Chemical Equations

Chemical Equations Word Equations: Formula Equations: Calcium metal reacts with oxygen gas to form calcium oxide. Water decomposes into hydrogen gas and oxygen gas. Formula Equations: 2 Ca (s) + O2 (g)  2 CaO (s) 2 H2O (l)  2 H2 (g) + O2 (g)

Synthesis 2 or more reactants form one product 2 Na (s) + Cl2 (g)  2 NaCl (s) CaO (s) + H2O (l)  Ca(OH)2 (aq) CO2 (g) + H2O (l)  H2CO3 (aq)

Decomposition One reactant forms 2 or more products 2 KCl (s)  2 K (s) + Cl2 (g) CaCO3 (s)  CaO (s) + CO2 (g) 2 NaHCO3 (s)  Na2CO3 (s) + H2O (l) + CO2 (g) 2 KOH (s)  K2O (s) + H2O (l) 2 NaClO3 (s)  2 NaCl (s) + 3 O2 (g) H2CO3 (aq)  CO2 (g) + H2O (l)

Single Replacement An element and a compound react to form a different element and compound Zn (s) + CuSO4 (aq)  ZnSO4 (aq) + Cu (s) 2 Li (s) + 2 H2O (l)  2 LiOH (aq) + H2(g) Zn (s) + 2 HCl (aq)  ZnCl2 (aq) + H2 (g) 2 NaBr (aq) + Cl2 (g)  2 NaCl (s) + Br2 (g)

Double Replacement 2 compounds react to form 2 different compounds CaCl2 (aq) + 2 AgNO3(aq)  Ca(NO3)2 (aq) + 2 AgCl (s) HCl (aq) + NaOH (aq)  NaCl (aq) + H2O (l)

Combustion A hydrocarbon reacts with oxygen producing carbon dioxide, water vapor, and heat. CH4 (g) + 2 O2 (g)  CO2 (g) + 2 H2O (g) C2H5OH (g) + 3 O2 (g)  2 CO2 (g) + 3 H2O (g)

Warm-up Who proved the Law of Conservation of Matter and what does it say? How do you show this in a chemical reaction? *Get out your Writing Chemical Equations HW (STAMP!) Announcements: *Quiz Grades-In Power School….what you heard is true. Balancing Reactions Quiz this Friday will replace your Nomenclature Quiz IF you do better! 

Balancing Reactions