1. Welcome! Directions: Answer the following questions on a blank piece of paper in the Catalyst section of your binder, silently and independently Log into your Chromebook

2. Announcements -Last day for revisions next Wednesday -Unit Exam next Thursday -Lab report due Monday

3. Photo of the day

4.  Friday Feb 6, 2015 Objectives : - SWBAT explain concentration on the molecular level -SWBAT calculate the concentration of a solution in g/L Homework: -Lab report due Monday

5. Use the “Particle View” handout to answer the questions on your handout in a group Defining Concentration

6. Concentration does not depend on size of sample, JUST the amount of solute per volume Key Point

7. Work in groups Calculating Concentration in g/L

8.  If 100 g of NaCl is dissolved in 1L of H 2 O, what is the concentration of the solution in g/L?

9.  Your friend gives you a 2 L bottle full of Kool-Aid and tells you the concentration is 50 g/L. How many grams of Kool-Aid are in the bottle?

10.  Which solution is the most concentrated? Why?

11.  During the summer, you set up a lemonade stand with your sister. You have 35 g of Lemonade powder and 5 L of water. What is the concentration of your Lemonade in g/L?

12.  How many grams of CO 2 are there in a 2 L bottle of Sprite that has a concentration of 2 g/L?

13. Exit Ticket  On chromes