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## Q3: Week 7 – Archive

Week of 3/23 – 3/27

3/23 – Monday – period 7

1: Review

solubility concentration terms:
Molarity
Percent By Mass

2: New part per million

molarity percent ppm 0607 ditto 2.pdf

molarity percent ppm 0607 ditto 2 KEY.pdf

HW:
1:  Please complete questions 13,14,15, and 16 of molarity percent ppm 0607 ditto 2 .pdf worksheet.
2: Review with key above.
3: You can do the homework with me below in the video below. You could stop me in the video, try a problem, then watch me complete it and so forth.

3/24 – Tuesday – period 7/8

1: Review of Part per million and percent concentration
2: Lab 18 – Solubility of potassium nitrate
HW:
Please complete the regents solutions questions below and place in the form below.

1)

Which sample represents a homogeneous mixture?

A) KCl (s)            B) KCl (g)            C) KCl (l)            D)  KCl (aq)

2)

What is the molarity of a solution that contains 112 grams of KOH in 2.00 liters of solution?

 A) 4.00 M B) 2.00 M C) 3.00 M D) 1.00 M
3)

What is the molarity of an  solution if 0.25 liter of the solution contains 0.75 mole of ?

 A) 0.33 M B) 6.0 M C) 3.0 M D) 0.75 M
4)

How many grams of ammonium chloride (gram formula mass = 53.5 g) are contained in 0.500 L of a 2.00 M solution?

 A) 53.5 g B) 26.5 g C) 10.0 g D) 107 g
5)

A 500. gram sample of an aqueous potassium chloride solution contains 0.025 grams of solute. What is the concentration of the solution in parts per million (ppm)?

 A) 50. ppm B)  ppm C)  ppm D) 250. ppm
6)

How many grams of KI are needed to prepare 2,000. grams of an aqueous solution containing 25 parts per million (ppm) of solute?

 A)  g B) .050 g C) 0.0125 g D)  g
7)

A solution of KCl(aq) contains 15 grams of solute in 85 grams of water. What is the concentration of the solution in percent by mass?

 A) 0.20% B) 15% C) 2.0% D) 6.0%
8)

According to the given table, how does a decrease in temperature from 40°C to 20°C affect the solubility of  and KCl?

 A) The solubility of  decreases, and the solubility of KCl decreases. B) The solubility of  decreases, and the solubility of KCl increases. C) The solubility of  increases, and the solubility of KCl increases. D) The solubility of  increases, and the solubility of KCl decreases.

9. What is the total mass of KNO3 that must be dissolved in 50. grams of H2O at 60.°C to make a saturated solution?

1. 32 g
2. 53 g
3. 64 g
4. 106 g

10.  A saturated solution of NaNO3 is prepared at 60°C using 100. grams of water. As this solution is cooled to 10°C, NaNO3 precipitates (settles) out of the solution. The resulting solution is saturated. Approximately how many grams of NaNO3 settled out of the original solution?
1. 46 g
2. 61 g
3. 85 g
4. 126 g

3/25 – Wednesday – period 7

1:RAT 42 – Individual
2: Table F: identifying soluble compounds based on Table F (solubility rules) or predicting whether a precipitate will form. See demo I did in class below:

TABLE F Fun 07.pdf

TABLE F Fun 07 KEY new.pdf

Tonights Lecture:

HW:

1: Please watch the Regents Lecture – Table F and Precipitates above.
2:  Please complete questions 1,2,3 of  TABLE F Fun 07.pdf (on the equations side) and questions         1 – 8 on the other side. I do the first one for you!

3/26 – Thursday – period 7/8

1: Complete RAT 42.
2: Complete Lab – 18

HW:

1: Complete lab 18 with conclusion – due Tomorrow Friday 3/27
2: Complete TABLE F Fun 07.pdf worksheet.
3: Review with the key.

TABLE F Fun 07 KEY new.pdf

3/27 – Friday – period 7

1: Handed back and reviewed RAT 42.
2: Started Lab 19 –

Next week:

Mon – give back DOG 7
CAT 14 – Wed
DOG – 8 – Thursday

HW: No homework…