This document contains the agenda and materials for a science class lesson on concentration. The teacher provides instructions for students to take their seats and get out their homework. Exit slip data from the previous day is reported, ranging from 77-93%. The learning objective for the day is stated as being able to describe the factors that affect the dissolving process. The document then includes sample problems, examples, practice questions, and an exit slip for students to complete to assess their understanding of concentration.

1. Launch: 1/7
 Grab your binder and immediately take a seat!
 Place launch paper and HW (practice questions) on your
desk.
 Yesterday’s Exit Slip Data:
89%
 Today’s Objective: I can describe the factors that affect
the dissolving process.

2. Launch: 1/7
 Grab your binder and immediately take a seat!
 Place launch paper and HW (practice questions) on your
desk.
 Yesterday’s Exit Slip Data:
77%
 Today’s Objective: I can describe the factors that affect
the dissolving process.

3. Launch: 1/7
 Grab your binder and immediately take a seat!
 Place launch paper and HW (practice questions) on your
desk.
 Yesterday’s Exit Slip Data:
86%
 Today’s Objective: I can describe the factors that affect
the dissolving process.

4. Launch: 1/7
 Grab your binder and immediately take a seat!
 Place launch paper and HW (practice questions) on your
desk.
 Yesterday’s Exit Slip Data:
93%
 Today’s Objective: I can describe the factors that affect
the dissolving process.

5. Launch 1/7
1. In 1-2 sentences, explain what you did in lab on
Friday.
• What variable did you change?
• What were the results of your experiment?

6. Launch 1/7
2. 5 grams of sugar would dissolve the fastest in
a. cold water.
b. warm water.
c. hot water.
d. none of the above.

7. Launch 1/7
1. Solubility is
a. when solvent particles are attacked by the solute.
b. how well a solute dissolves in a given amount of solvent.
c. when two substances are not evenly mixed throughout.
d. how well a solvent dissolves in a given amount of solute.

8. New Changes for the New Year!
 Late homework policy
 Late homework in now due the day after you return
 Notes packets, handouts, and practice questions will
can be found:
 at the back of the classroom

9. New Changes for the New Year!
 Class consequences
1. Name on board
2. Take a break
3. Call home
4. Sent to Mr. Wandera
 Rules: still the same 7

10. January Calendar

11. What is concentration?
Mr. Heffner
1/11/10

12. Review: What is solubility?
 Factors that affect solubility of solids
1. Temperature: temperature = solubility
2. Surface Area: surface area = solubility
 Factors that affect solubility of gases
1. Temperature: temperature = solubility
2. Pressure: pressure = solubility

13. What is concentration?
 Concentration is…
 the amount of solute dissolved a in solution.
Concentrated Dilute
 High concentration  Low concentration
 Large amount of solute  Small amount of solute
 Really sweet Kool-aid  Tasteless Kool-aid

14. What is concentration?
 Concentration is measured in…
 grams per liter (g/L) volume
 the # of grams of solute in one liter of solvent
 Example: Salt water
 50g of NaCl (salt) mass
 1L of H2O (water)

15. Examples
1. If 50g of NaCl is dissolved in 1L of H2O, what is the
concentration of the solution in g/L?
mass
50 g
1L = 50 g/L
volume

16. Examples
2. If 50g of NaCl is dissolved in 1L of H2O, what is the
concentration of the solution in g/L?
50 g
2L = 25 g/L

17. Examples
3. How many grams of salt are there in a 1L solution of salt
water that has a concentration of 30g/L?
30 g 1 X 30 g
1L x = = 30g
1L 1

18. Examples
4. How many grams of salt are there in a 3L solution of salt
water that has a concentration of 30g/L?
30 g 3 X 30 g
3L x = = 90g
1L 1

19. Whiteboards
 Work in pairs
 Trade-off marker every question
 Partner without the marker should be checking
work at each step!
 You have 60 seconds to solve the question
 Show all of your work!
 Don’t forget units!
 Lift board only when prompted

20. If 100g of NaCl is dissolved
in 1L of H2O, what is the
concentration of the
solution in g/L?

21. What is the concentration of
the solution in g/L if If
100g of KBr is dissolved in
10L of H2O?

22. How many grams of sugar
are there in a 1L solution of
Kool-aid that has a
concentration of 6g/L?

23. How many grams of CO2 are
there in a 2L bottle of
Sprite that has a
concentration of 2g/L?

24. How many grams of CO2 are
there in a .5L bottle of Diet
Coke that has a
concentration of 20g/L?

25. Practice Questions
 Practice question worksheet

26. Exit Slip
1. Concentration is
a. how well a solute dissolves in a given amount of solvent.
b. when two substances are not evenly mixed throughout.
c. a measure of the amount of solute dissolved in a
solvent.
d. reported in units of cm/L.

27. Exit Slip
2. Concentration is calculated by
a. dividing the mass of the solute by the volume of the
solvent.
b. summing the masses of all the parts in a solution.
c. multiplying the masses of the solute and solvent.
d. multiplying the volume of the solute by the mass of the
solvent.

28. Exit Slip
3. If 60g of NaCl is dissolved in 20L of H2O, what is
the concentration of the solution in g/L?
a. 20g/L
b. 30g/L
c. 60g/L
d. 120g/L

29. Exit Slip
4. How many grams of salt are there in a .5L solution
of sugar water that has a concentration of 10g/L?
a. 2g
b. 5g
c. 20g
d. 50g

30. Exit Slip
5. If the solubility of C6H12O6 (sugar) is 40g/100L,
what mass of sugar can be dissolved in 50L of
water?
a. .4g
b. .4g/L
c. 20g
d. 400g/L

31. Homework
 Finish practice questions