3 Signs of a chemical reaction Production of….HeatLightGasPrecipitate (solid formed from two liquids)Color change
4 The 5 Types of ReactionsWe classify reactions into 5 categories so that we may more easily predict the products.NEXT
5 A + B AB + Synthesis Definition Synthesis reaction – 2 substances are combined to form a single productCombination reactions may also be called composition or synthesis reactions.A + B AB+MENU
6 Synthesis Examples 2Mg + O2 2MgO Magnesium and oxygen combine to form magnesium oxide.2H2 + O2 2H2OHydrogen and oxygen combine to form dihydrogen monoxide (water)MENU
14 Combustion Definition Combustion reaction – Hydrogen or a hydrocarbon (H and C) burn in oxygen to produce water and carbon dioxide. Heat is given off as energy.CxHx + O2 XH2O + XCO2MENU
15 Combustion Examples CH4 + 2O2 2H2O + CO2 Methane burns in oxygen to produce water and carbon dioxide.C12H22O O2 11H2O + 12CO2A sugar molecule burns in oxygen to produce water and carbon dioxide.MENU
16 Combustion demonstration Ethanol + Oxygen yields Water + Carbon dioxideC6H12O6 + O2 H2O + CO2
20 Single Replacement Examples Mg + BeO Be + MgOMagnesium replaces beryllium in beryllium oxide to form magnesium oxide and beryllium.2Na + 2HCl H2 + 2NaClSodium replaces hydrogen in hydrochloric acid to yield hydrogen and sodium chloride.MENU
21 Single Replacement Demo. A single replacement of Zinc metal for hydrogen in hydrochloric acid.Zn + 2HCl H2 + ZnCl2
22 Double Replacement Definition Double Replacement reaction – Elements in 2 compounds switch places to form 2 new compounds.AB + CD AD + CB++MENU
24 Double Replacement Examples MgO + BeS MgS + BeOOxygen and sulfur switch places to form magnesium sulfide and beryllium oxide.Na2S + Zn(NO3)2 2Na(NO3) + ZnSSulfur and nitrate switch places to form sodium nitrate and zinc sulfide.
25 Make a Venn diagram comparing…. Synthesis vs. DecompositionSingle replacement vs. double replacement
31 Counting atomsHow many Carbons are in each of the following compounds:CO2C2H6Na(CO3)2Mg(C2O)4
32 Warm-upAround the room there are _7__ pictures representing types of reactions. YOUR pictures.Make a list in your notebook, 1- _7__. Try to determine what type of reaction is being represented by the drawing.
33 DefinitionsCo-efficient: The number before an element/compound (allowed to change when balancing)Ex: 2 H2Subscript: The small number after an element/compound (NEVER allowed to change when balancing
34 Sacrificial Gummy Bear Demonstrates:Two types of chemical reactionsHIGHLY Exothermic energy changeChemical energy converted into thermal, radiant and sound energy
50 Locations Ring stands are on top of fume hood Clamps are in 4A All other materials are on counter by sink 1
51 Materials Ring stand/clamp Test tube 1-2 pea-size chunks of Zn 1 bottle of HCl
52 Procedure Set up your apparatus as demonstrated Add the Zinc to the test tubeAdd approximately 2-4 cm of HCl to the test tubeCover with a small piece of aluminum foilLook for signs of a chemical reactionAllow to react for 3-4 minutes
53 Test Raise your hand when time has elapsed Use the flame test to look for signs of H2 gas
54 Clean up All test tubes must be cleaned out with Alconox Make sure that all acid is flushed with a large amount of waterSinks are to be totally clean
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