Demo Single Replacement RXN - Silver in Silver Nitrate will be replaced by Cu from Cu strip. - Ag(NO 3 ) + Cu  Cu(NO3) + Ag - Observe throughout notes - Evidence: Silver forms on strip and blue solution made.

6 Types of RXNs You will identify, give evidence for, predict products of, and classify the following types of chemical reactions: 1. Synthesis (combination) 2. Decomposition 3. Single Replacement 4. Double Replacement 5. Neutralization (acid/base) 6. Combustion

Chemical RXN A chemical change: any change in which a new substance is formed. Evidence of a Chemical Change: 1) Release of energy as heat/light 2) Change in color 3) Formation of a gas (bubbles) 4) Formation of a percipitate

Synthesis (Combination)  Two or more reactants combined to form a compound. A + B  AB EX) Sodium metal and chlorine gas combine to form sodium chloride. 2Na + Cl 2  2NaCl

 SYNTHESIS REACTION (iron + sulphur):  DVe5FAI DVe5FAI

Decomposition (Breakdown)  Opposite of synthesis.  Reactant breaks down into two or more products. AB  A + B EX) Table salt, sodium chloride, can be broken down into sodium metal and chlorine gas by melting salt at 800ºC and running electricity through it. 2NaCl  2Na + Cl 2

DECOMPOSITION REACTION: EA_Ak

Single Replacement One element in a compound is replaced by another element to form a different product. (Only 1 thing changes) A + BC  B + AC Ex) Aluminum foil in a solution of copper(II) chloride produces solid copper and aluminum chloride. 2Al + 3CuCl 2  3Cu + 2AlCl 3

SINGLE REPLACEMENT: tMKc

Double Replacement Two compounds react, with elements switching places between the original compounds. AB + CD  AD + CB EX) Two solutions react to form a precipitate (solid) and another solution. - When potassium chromate and silver nitrate react, they form a red precipitate, silver chromate, in a solution of potassium nitrate. K 2 CrO 4 + 2AgNO 3  Ag 2 CrO 4 + 2KNO 3

 DOUBLE REPLACEMENT: DOUBLE REPLACEMENT:  FLrPTa4 FLrPTa4

Acid-Base Neutralization RXN  Reactions occur when an acid (most compounds starting with H) and a base (most compounds ending in OH) react to form a salt and water.  Neutralization reactions are a type of double replacement. Acid + base  salt + water HOH HX + MOH  MX + H 2 O where X and M are elements

Ex) Sulfuric acid is used to neutralize calcium hydroxide: H 2 SO 4 + Ca(OH) 2  CaSO 4 + 2H 2 O  NEUTRALIZATION: NEUTRALIZATION:  V V

Combustion RXN  Reactions occur when a compound or element react with oxygen to release carbon dioxide, water vapor & energy. (Hydrocarbon Combustion) C X H Y + O 2  CO 2 + H 2 O Carbon Dioxide & Water ALWAYS formed!

Ex) Natural gas (methane) is burned in furnaces to heat homes. CH 4 + O 2  CO 2 + 2H 2 O + energy  METHANOL + oxygen: METHANOL + oxygen:  G1qXY&feature=related G1qXY&feature=related

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