Warmup (5 minutes) (please draw in lone pairs yourself) 1. Rank these molecules from most(1) to least(5) polar H O-H H H H-C-O-C-H H H H H H H H H-C-C-C-C-C-OH H H H H H H H O H H-C-C-C-H H H H n-amyl alcohol H H H H H H H-C-C-C-C-C-C-H H H H H H H 2. Which compound to the right would be the best solvent for NaCl? Explain. methanol H-O-Cl hexane isopropyl alcohol dihydrogen monoxide 1 2 4 3 5 H H-C-O-H H
13
Embed
Warmup (5 minutes) (please draw in lone pairs yourself) 1. Rank these molecules from most(1) to least(5) polar HO-HHO-H H H H-C-O-C-H H H H H H H H H-C-C-C-C-C-OH.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Warmup (5 minutes) (please draw in lone pairs yourself)
1. Rank these molecules from most(1) to least(5) polar
HO-H
H HH-C-O-C-H H H
H H H H HH-C-C-C-C-C-OH H H H H H
H H O HH-C-C-C-H H H Hn-amyl alcohol
H H H H H H H-C-C-C-C-C-C-H H H H H H H
2. Which compound to the right would be the best solvent for NaCl? Explain.
methanol
H-O-Cl
hexaneisopropyl alcohol
dihydrogen monoxide
1
2
4
35
HH-C-O-H H
Concentration Part 1Percent Composition and
Parts Per MillionGet out your calculator!
1.Which salt solution has the greatest concentration?
[ ] is a measure of the amount of solute in a given amount of solution
Beaker A3 molecules
100 mL solution
Beaker B5 molecules
100 mL solution
Beaker C7 molecules
200 mL solution
2. What is the percent composition of girls and boys in the AP chem class shown?
# Girl students?# Boy students?Total # students?
100 X wholepart
nCompositio %
boys 28.6% 100 X 72
Boys %
girls 71.4% 100 X 75
Girls %
3. A bottle contains 500. mL of water. If this solution has 15.5 mL of pure hydrogen peroxide, what is the concentration of hydrogen peroxide in this solution?
100 X solvent of amount solute of amount
solute of amount nCompositio %
100 X mL 500 mL 15.5
mL 15.5 Peroxide Hydrogen %
3.01% 100 X mL 515.5
mL 15.5 Peroxide Hydrogen %
4. I dilute 10.0 mL of HBr to make a 42.5% HBr solution. What will the total volume of the solution be?
x = 23.5 mlHmmmm…..how much of the solution is just solvent (water)?
______ ___________ 42.5 42.5
5. If a concentrated solution of hydrogen peroxide has a percent composition of 65%, how many mL of pure hydrogen peroxide would be contained in a 0.750 L solution?
7. For cavity prevention, the recommended concentration of fluoride ions in our drinking water is 0.7 to 1.2 parts per million (ppm). Too much fluoride can result in discolored teeth. If the concentration of F- in Orange County is 0.85 ppm, what mass of fluoride would be contained in a 7.2 gram tap water sample from and OCHSA bathroom?
ppm = amount solute 106 amount solution
0.85 = x grams F-
106 7.2 gram
0.85 (7.2 gram ) = x grams F-
106
6.1 x 10-6 g F-
ppm = amount solute 106 amount solution
8. What is the concentration of mercury (in ppm) if 3 grams mercury is found in a 15 kg sample of ocean water?15 kg (1000g) = 15000 g 1kg
x ppm = 3 g 106 15000 g
x ppm = 3 g (106 ) 15000 g
x = 200 ppm
9. What mass of mercury (in grams) would be contained in a 40.0 kg sample of ocean water at this same concentration?
40.0 kg (1000g) = 4 x 104 g 1kg
ppm = amount solute 106 amount solution
200 ppm = x g Hg 106 4 x 104 g
200 ppm(4 x 104 g) = x = 8 g Hg 106
Análisis químico mg/l (ppm)Calcio 11.9
Magnesio 10.3Hierro menos de 0.1Flúor menos de 0.1
Sodio 7.0pH 6.63
Potasio 4.7Sulfatos 4.0
Dureza del calcio 29.7Dureza del
magnesio 35.7
Alcalinidad total 67.8S.T.D 184
El Agua Cristal es mejor porque ha sido filtrada por la naturaleza durante décadas, adquiriendo de manera natural los minerales necesarios para un perfecto equilibrio del organismo.
La NSF certifica que Agua Cristal cumple con las más estrictas normas de calidad requeridas por la FDA de los Estados Unidos. Un envase de 600 ml contiene:
Sweet! Concentration Concepts! Work in lab groups Pour ‘solution’ back into ‘original solution’
when you’re done We haven’t done all the concentration
types YET, but you can go back and do those problems later if you can’t figure them out today (formulas are all given)