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Final Review Final Review Honors Chemistry
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Classes of matter Matter Pure substance elementcompound mixture homogeneousheterogeneous
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Physical Changes - are those in which the identifying properties of a substance are unchanged - Ex. : change of phase breaking, cutting breaking, cutting dissolving dissolving
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Chemical Changes - are those in which different substances are formed - Ex.: burning rusting rusting decaying or spoiling decaying or spoiling acid reacting with metal acid reacting with metal
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subatomic particles Atomic no.=# protons Atomic no.=# protons #protons=#electrons #protons=#electrons Mass no.=#protons + Mass no.=#protons + # neutrons # neutrons
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Electron configuration notation Helium has 2 electrons, so its electron configuration would be 1s 2 Li 1s 2 2s 1 N 1s 2 2s 2 2p 3 Ne 1s 2 2s 2 2p 6 Na 1s 2 2s 2 2p 6 3s 1 or [Ne]3s 1 Principal quantum number sublevel No. of electrons
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Every orbital can hold two electrons.
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d orbitals
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Predicting electron configurations from the periodic table.
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Ways to represent titanium 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 2 electron configuration __ __ __ __ __ __ 1s 2s 2p 3s 3p 4s 3d Ti: 22 2 8 10 2
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How would calcium and chlorine combine? Ca Cl CaCl 2
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Write the formulas- always put the cation first K + and N 3- K3NK3NK3NK3N Ca 2+ and N 3- Ca 3 N 2 Ba 2+ and NO 3 - Ba(NO 3 ) 2 Criss-cross rule of thumb
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Naming molecular compounds Use prefixes 1mono- Use prefixes 1mono- 2di- 3tri- 4tetra- 5penta- 6hexa- 7hepta- 8octa- 9nona- 10deca-
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My favorite no name NH 4 CO 3 Write the formula for Calcium chloride Nitrogen tetrahydrogen carbon trioxide CaCl
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Ionic or covalent? NaBr CH 4 Fe 2 O 3 CO 2 CaO NH 4 Cl SiCl 4 Name ionic covalent ionic covalent ionic covalent Sodium bromide Carbon tetrahydride Iron oxide Carbon dioxide Calcium oxide Ammonium chloride Silicon tetrachloride
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Types of reactions Decomposition: AB A + B Synthesis (or combination): A + B AB Single Replacement (or displacement): A + BC B + AC A + BC B + AC Double Replacement (or displacement): AB + CD AD + CB AB + CD AD + CB Combustion: CH 4 + 2O 2 CO 2 + 2H 2 O
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Balance and classify Al + Cl 2 AlCl 3 Al + Cl 2 AlCl 3 2Al + 3Cl 2 2AlCl 3 Zn + HCl ZnCl 2 + H 2 Zn + HCl ZnCl 2 + H 2 Zn + 2HCl ZnCl 2 + H 2 Zn + 2HCl ZnCl 2 + H 2 Mg(ClO 3 ) 2 MgCl 2 + O 2 Mg(ClO 3 ) 2 MgCl 2 + O 2 Mg(ClO 3 ) 2 MgCl 2 + 3O 2 C 4 H 8 + O 2 CO 2 + H 2 O C 4 H 8 + O 2 CO 2 + H 2 O C 4 H 8 + 6O 2 4CO 2 + 4H 2 O
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Writing Balanced equations (NH 4 ) 2 CO 3 + Ba(NO 3 ) 2 (NH 4 ) 2 CO 3 + Ba(NO 3 ) 2 NH 4 + CO 3 2- Ba 2+ NO 3 - NH 4 + NO 3 - + 2NH 4 NO 3 BaCO 3 Double displacement Net ionic: CO 3 2- + Ba 2+ BaCO 3
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Chemical reactions involve energy Endothermic reactions absorb energy Endothermic reactions absorb energy ex.: photosynthesis CoCO 3 + 81.6 kJ CoO + CO 2 Exothermic reactions give off energy Exothermic reactions give off energy ex.: burning of wood C(s) + O 2 (g) CO 2(g) + 393.5 kJ
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Reaction Tendencies Reactions occur spontaneously when a lower energy state is achieved. Reactions occur spontaneously when a lower energy state is achieved. In exothermic reactions, the products have less energy than the reactants.
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Reactions occur spontaneously when a state of less order is achieved. Reactions occur spontaneously when a state of less order is achieved. Entropy is the disorder in a system.
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Molecular mass (molar mass) NaCl 23.0 + 35.5 = 58.5 Ba(NO 3 ) 2 137.3 + 2(14.0) + 6(16.0) = 261.3 CuSO 4 5H 2 O 63.5 + 32.0 + 4(16.0) + 10(1.0) + 5(16.0) = 249.5
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Solution concentrations Percentage by weight. g solute x 100% g solution g solution g solute x 100% g solute x 100% g solute + g solvent g solute + g solvent Molality moles solute = m kg solvent kg solvent Molarity M = moles solute L solution L solution
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MV = moles Dilutions Titrations M 1 V 1 = M 2 V 2 M a V a = M b V b If I wanted 100ml of 2.0M HCl, how much 6.0M HCl would I need? 6.0M x ?ml = 2.0M x 100ml 33.3ml 33.3ml
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Conversion Factors Molar mass Molar mass atomic mass in g = 1 mole atomic mass in g = 1 mole Volume of gas Volume of gas At STP, 1 mole gas = 22.4L At STP, 1 mole gas = 22.4L Mole-mole ratio coefficients from balanced equation Mole-mole ratio coefficients from balanced equation Avogadros number Avogadros number 6.02 x 10 23 molecules = 1 mole 6.02 x 10 23 molecules = 1 mole
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How many molecules are in 2.0 moles of H 2 O? 2.0 moles x 6.02x10 23 molecules 1 mole 1 mole
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What volume would 2.5 moles of H 2 gas have at STP? 2.5 moles x 22.4L = 56L 1 mole 1 mole
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Stoichiometry g g mole mole mole mole L (gas) L (gas)molecules Molar mass 22.4L=1 mol 6.02 x 10 23 molecules = 1 mole
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Multiple conversion factors may be needed How many grams of CO 2 are formed from 18.5 grams of O 2 in the following reaction? How many grams of CO 2 are formed from 18.5 grams of O 2 in the following reaction? 2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O 2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O 18.5 g O 2 x 1mole O 2 x 4 mole CO 2 x 44 g CO 2 32 g O 2 7 mole O 2 1mole CO 2 32 g O 2 7 mole O 2 1mole CO 2 14.5g
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How many liters of CO 2 are formed from 18.5 grams of O 2 in the following reaction? 2C 2 H 6 (g) + 7O 2 (g) 4CO 2 (g) + 6H 2 O(g) 2C 2 H 6 (g) + 7O 2 (g) 4CO 2 (g) + 6H 2 O(g) 18.5 g O 2 x 1mole O 2 x 4 mole CO 2 x 22.4 liters 32 g O 2 7 mole O 2 1mole CO 2 32 g O 2 7 mole O 2 1mole CO 2 7.40L
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Limiting Reactants In a chemical reaction, the reactant which gets used up first limits how much product is formed. In a chemical reaction, the reactant which gets used up first limits how much product is formed. i.e. If I had 5 moles of Al and 4 moles of Cl 2, which reactant is limiting? 2Al + 3Cl 2 2AlCl 3 5 mole Al x 3 mole Cl 2 = 7.5 mole Cl 2 2 mole Al 2 mole Al Cl 2 is limiting and Al is excess. Have Need
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% yield = actual x 100% % yield = actual x 100% theoretical theoretical If 5.50g of hydrogen reacts with nitrogen to form 20.4g of ammonia, what is the percent yield? N 2 (g) + 3H 2 (g) 2NH 3 (g) Actual = 20.4g Theoretical = 5.50g H 2 x 1 mol H 2 x 2mol NH 3 x 17.0g NH 3 2.0g H 2 3mol H 2 1mol NH 3 2.0g H 2 3mol H 2 1mol NH 3
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The amount of heat gained or lost depends on the amount of reactants used. 2Na 2 O 2 + 2H 2 O 4NaOH + O 2 + 215.76 kJ How much heat is released by the reaction of 5.0 moles of Na 2 O 2 ? 5.0 moles Na 2 O 2 x 215.76 kJ = 539.4 kJ 2 mole Na 2 O 2 2 mole Na 2 O 2
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Q = mcT Heat = mass specific heat change gained or lost in temp Ex: How much heat is lost when a solid aluminum ingot with a mass of 411g cools from 660.0˚C to 25˚C? c Al = 0.903J/g˚C T = 660.0 – 25 = 635˚C T = 660.0 – 25 = 635˚C Q = (411g)(0.903J/g˚C)(635˚C)=236,000 J
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Charles Law V 1 = V 2 P constant T 1 T 2 T 1 T 2 Boyles Law P 1 V 1 = P 2 V 2 T constant Combined P 1 V 1 = P 2 V 2 T 1 T 2 T 1 T 2 Gay-Lussacs Law P 1 = P 2 V constant T 1 T 2 T 1 T 2
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If temperature increases, volume ______. If temperature increases, volume ______. increases. increases. Always change Celsius to Kelvin degrees. Ex.: If a gas expands from 125ml to 850ml, its original temperature of 15 C must have changed to what? 15 C=288K 288K x 850ml = 1958.4K 125ml 125ml
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52.5 ml of a gas is collected over water at 20˚C and 100.0 kPa. What is the pressure of the dry gas? 100.0 kPa = P gas + P water P water at 20˚C = 2.3 kPa 100.0 kPa – 2.3 kPa = 97.7 kPa What would be the volume of this gas at STP? P 1 = 97.7 kPaP 2 =101.325kPa V 1 = 52.5 mlV 2 = ? T 1 = 20˚C=293 K T 2 =273 K
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P1V1 = P2V2P1V1 = P2V2P1V1 = P2V2P1V1 = P2V2 T 1 T 2 T 1 T 2 52.5ml97.7 kPa = 101.325kPa V 2 52.5ml97.7 kPa = 101.325kPa V 2 293K273K 293K273K V 2 = 47.2ml
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PV=nRT P=Pressure P=Pressure V=volume V=volume n=moles n=moles R= gas constant = 0.0821 Latm R= gas constant = 0.0821 Latm molK molK 8.31L·kPa 8.31L·kPa molK or 62.4 Ltorr molK or 62.4 Ltorr molK molK T= temperature (K) T= temperature (K)
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When given three of the four variables, we can find the fourth. A gas has a volume of 2.20L at 25 C. If there are.085 moles of the gas, under what pressure must the gas be held? A gas has a volume of 2.20L at 25 C. If there are.085 moles of the gas, under what pressure must the gas be held? P = nRT P = nRT V P = (.085mole)(0.0821 Latm)(298K) P = (.085mole)(0.0821 Latm)(298K) 2.20L molK 2.20L molK
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Compute the relative rate of diffusion of helium and argon.
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My favorite no What volume of 2.0M HCl do you need to get.5 moles of HCl? 2.0M x 22.4L = 44.8L mole
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[H + ] = 10 -pH [OH - ] = 10 -pOH pH + pOH = 14.0 Sample problem: A 0.01 M sample of NaOH completely ionizes. What is its pH, pOH, [H + ], and [OH - ] ? [OH - ] = 0.01 mole/L = 10 -2 pOH = 2 pH = 14 – pOH = 12 [H + ] = 10 -12
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pHpOH [H 3 O + ] [OH - ] 68 10 -6 10 -8 1 1310 -1 10 -13
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Find the pH of a solution with [H 3 O + ] of 6.59 x 10 -10 M. pH = -log(6.59 x 10 -10 ) pH = -(log 6.59 + log 10 -10 ) = 9.18 = 9.18 Find the [H 3 O + ] of a solution with a pH of 9.18. Antilog(-9.18)
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Equilibrium Shifts Concentration Removing products shifts equilibrium right Removing products shifts equilibrium right Adding a product shifts equilibrium left Adding a product shifts equilibrium leftPressure Increasing pressure on gases shifts equilibrium toward side with fewer number of moles Increasing pressure on gases shifts equilibrium toward side with fewer number of moles
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Redox reactions Identify the reducing and oxidizing agents. Identify the reducing and oxidizing agents. Mg (s) + Cu(NO 3 ) 2 (aq) Mg(NO 3 ) 2 (aq) + Cu (s) 0 +2 +5 -2 +2 +5 -2 0 0 +2 +5 -2 +2 +5 -2 0 Mg is oxidized and is the reducing agent Cu is reduced and is the oxidizing agent
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Types of radiation Alpha (α) low penetrating power Beta ( β) moderate penetrating power Gamma (γ) high penetrating power
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Transmutations Complete the following nuclear equation. Complete the following nuclear equation.
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Half Life If you start with 2.97 x 10 22 atoms of, How many atoms will remain after 62 minutes? The half life of is 15.49 minutes. 62 = 4 half lives 15.5 2.97 x 10 22 atoms (½) 4 = 1.86 x 10 21 atoms
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Fission- breaking apart of a nucleus Can cause a chain reaction
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Fusion- happens on the sun
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TITRATION, NEUTRALIZATION…
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