APChem Big Idea 3 – Flashcards
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Unlock answersChemical Reactions: Changes in matter involve the arrangement and/or reorganizations of atoms and/or the transfer of electrons. [image] i |
Synthesis A + B --> AB [image] |
Decomposition AB--> A + B [image]
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Single Displacement AB + C--> CB + A [image] |
Double Displacement AB + CD --> AD + CB Remember, in order for this to happen something MUST come out of solution (HOH, gas, ppt.) [image] |
Combustion CH4 + O2 --> CO2 +2H2O [image] |
Acid-Base Neutralization HA + BOH--> HOH + BA [image] |
Redox A + + e- a A (reduction)
B a B + e- (oxidation) [image]
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Balanced Equations Complete Molecular: AgNO3 (aq) + KCl(aq)-->AgCl(s) + KNO3 (aq) Complete Ionic : Ag+(aq) + NO3-(aq) + K+(aq) + Cl-(aq)--> AgCl(s) + K+(aq) + NO3-(aq) Net Ionic : Ag+(aq) + Cl-(aq)--> AgCl(s) Spectator ions should not be included in your balanced equations.
Remember, the point of a Net Ionic Reaction is to show only those ions that are involved in the reaction. Chemists are able to substitute reactants containing the same species to create the intended product. You only need to memorize that compounds with nitrate, ammonium, halides and alkali metals are soluble. |
Making Predictions
Solid copper carbonate is heated strongly: CuCO3 (s) -->CuO (s) + CO2 (g)
What evidence of a chemical change would be observed with this reaction? One would observe a color change and evolution of a gas
What is the percent yield of CO2 if you had originally heated 10.0g CuCO3 and captured 3.2g CO2 ? Step 1: Find the Theoretical Yeild 10.0g CuCO3 x(1mol/123.555g) x (1mol CO2 /1 molCuCO3 ) X 44.01gCO2/mol = 3.562 gCO2 Step 2: Find Percent Yield (3.2 g / 3.562 g) * 100 = 89.8 % 90% with correct sig figs
How could you improve your percent yield? -reheat the solid, to see if there is any further mass loss -make sure you have pure CuCO3
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