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Chem 141 Week 7

by: Sydney

Chem 141 Week 7 CHM141


GPA 3.7

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Finish up redox example, how to convert from grams to grams and molarity to grams. Intro to thermodynamics and electrochemistry
General Chemistry
Brandy R Fox
Class Notes
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This 4 page Class Notes was uploaded by Sydney on Sunday October 16, 2016. The Class Notes belongs to CHM141 at Saint Martin's University taught by Brandy R Fox in Fall 2016. Since its upload, it has received 3 views. For similar materials see General Chemistry in Chemistry at Saint Martin's University.


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Date Created: 10/16/16
Week 7 Finishing redox reactions +​ 2+​ Cu(s)+2Ag​ (aq)--->Cu​ (aq)+2Ag(s) ↓ ↓ ↓ ↓ 0 +1 +2 0 Cu oxidation Ag reduction Net charge on both sides is 2+ Activity serie​ How oxidized or reactive metals are Bottom of list are everyday metals Hydrogen is the benchmark for “will it react in acid” anything below will not react Any metal can be oxidized by anything below it on list/ The higher metal will be going forward oxidizing and the lower one will be going backwards being reduced Cu(s)+2Ag(s)​ --> Cu​ +Ag(s)​ 2+​ - Cu→ Cu​ +2e​ Ag​ +2e​ → 2Ag(s) Reaction will happen because the higher metal (Cu) is oxidized Predicting products: +​ Li(s)+2H​ (aq) → ? +​ - Li → Li​ +e​ 2H​ +2e​ → H​ 2 Need electrons to cancel out so multiple top equation by 2 +​ - 2Li →2 Li​ +2e​ Cross out electrons and add the reactions back together +​ +​ 2Li(s)+2H​ → 2Li​ +H​ (g) 2​ Quantitative thinking CH​ 4​O​ (g2​ CO​ (g)+22​ O(l) 2​ ↓ ↓ ↓ ↓ 1 mol 2 mol 1 mol 2 mol ~ 16 g 64g 44g 36g 1 mol CH​ 2 mol O​ “Stoichiometrically equivalent” 4 ​ 2 1 mol CO​ or2​ 2 mol H​ O2​ To move from g of a to g of b follow this: g of A Mole Coefficient of B Molar mass of B =g of B Molar mass of A Coefficient of A Mole Limiting reactants N​2​3H​ 2​2NH​ 3 84 g of N​ 2 12g H​ 2 Name Amount (g) Molar mass Mol (g/molm) coefficient N​2 84 28 3.0 2 mol NH​ 3 6.0 mol NH​ 3 1 mol N​ 2 H​2 12 2.0 6.0 2 mol NH​ 3 4 mol NH​ 3 3 mol H​ 2 H​2 ​ the limiting reagent Theoretical yield​- Complete consumption of L.R everything reacts Percent yield​- How much you actually get relative to expected Actual__ Theoretical x 100 = % yield Concentration - Molarity (mol/L) Grams of A →molar mass → moles of A → M → Volume or M of A ↓ Stoich. Coefficient ↓ Grams of B ← Molar mass←Moles of B→M→Volume or M of B What volume of 0.250 M solution AgNO​ reacts wi3​ 18.6g K​ PO​ 3​ 4 Balanced equation: 3AgNO​ + 3​ PO3​→ 4​​ PO​ +3​KNO4​ 3 18.6g K​ P3​ 4 Mol K​ 3​​ 4 3 mol AgNO​ 3 1 L 1.05 L AgNO​ 3 212.27 g 1 mol K​ PO​ 0.250 mol 3​ 4 Thermodynamics -The study of energy and its transformations thermochemistry​-Portion that involves relationship between chemical change and energy Energy​-Capacity to do work or transfer heat Work - ​ Movement of object against force Heat ​- Energy used to cause the temperature of object to increase Potential energy -stored energy Electrostatic potential energy -virtue of position -arises from attraction between charged particles -chemical bonds Eel= K ​ Q​ Q​ 1​ 2 Ep= (m)(g)(h) D m=mass g= gravitational constant 9.8 m/s​ 2 K= constant 8.99 x 10​ jm/C​​ 2 h= height Q​1​​2​ charges on particles -arises from attraction between charged particles D = distance Eel= ​K Q​ 1​ 2 Kinetic energy 2 2 Ek= ½ MV​ With units Ek= ½ Kg(m/s)​ -V velocity -M mass Arises when force acts upon an object Force ​- A push or pull J (Joule) is the SI unit for energy 2​ 2 1 J= 1 Kg m​ /s​ -other energy units calories 1 cal= 4.184 J 1 Calorie= 1Kcal=1000 calories System​- Portion of universe singled out for study Surroundings-​ Everything else in universe not needed Universe​- System + surroundings


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