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# chap6 - 3 Choose STP standard temperature and pressure T =...

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1 Chap 6 1. Mole concept- Avogadro’s number a) Same as a dozen = 12 units 12.0 g of carbon-12 have 6.02 x 10 23 atoms b) Molar mass- mass of 1 mole of a substance. 2. Balancing chemical equations- 3. Gas- Avogadro said that the equal volume of gas at the same temp, pressure contain the same number of molecules. Compared the mass of different gas at the same volume. Four terms to describe a Gas 1. Pressure- (P) kinetic energy of gas particles resulting in a force. Pressure = force/area = units 1 atm = mmHg = 760 torr = 760 barr 2. Volume- (V) volume of the container is equal to the volume of the gas. units = liters (L) 3. Temperature-(T) average kinetic energy of gas particles. units = always in Kelvin K = ° C + 273 4. Amount of gas-(n)

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2 units = moles Gas Pressure- a) Atmospheric pressure- column of air directly above your head, gravity provides the force. Barometer- Diving- a) Give the gas law- (overhead) b) Ideal gas law. PV = nRT R = gas constant, 0.0821 L atm/ mol K T = Kelvin V = Liters P = atm Column of air

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Unformatted text preview: 3 Choose STP- standard temperature and pressure. T = O C, P = 1 atm V = nRT/P, 1 mole of gas at STP = 22.4 L c) Relationship of PV = constant P increase V decrease d)Temp and volume, V/T = constant V/T = V 2 /T 2 Increase V increase Temp 4. Solutions-solute = dissolved in the solvent, lesser amount solvent = greater amount aqueous = solution with water as the solvent a) molarity (M) = moles solute/liter solvent Ex. What is the molarity of 3.4 g of sodium chlorine dissolved in 546 mL of water? b) % concentration. % volume = volume of solute/ volume of solution X 100 % mass = mass of solute / mass of solution X 100 c) Solubility-1) Covalent compounds- “likes dissolve likes” Soap- predict which compound is soluble in water or CCl 4 4 CH 3 CH 2 CH 2 CH 2 CH 3 H 2 S Sugar C 6 H 12 O 6 2) Ionic compounds- look it up. If soluble dissociate into ions. XY X + + Y-NaCl Na + (aq) + Cl-(aq) AgCl AgCl CaCO 3 CaCO 3 Na 2 CO 3 2Na + (aq) + CO 3 2-(aq)...
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chap6 - 3 Choose STP standard temperature and pressure T =...

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