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:

  Today’s Objective: I can describe the factors that affect the dissolving process.

89%

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:

  Today’s Objective: I can describe the factors that affect the dissolving process.

77%

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:

  Today’s Objective: I can describe the factors that affect the dissolving process.

86%

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:

  Today’s Objective: I can describe the factors that affect the dissolving process.

93%

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?

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.

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.

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

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

January Calendar

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

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

What is concentration?   Concentration is…

  the amount of solute dissolved a in solution.

Concentrated   High concentration   Large amount of solute

  Really sweet Kool-aid

Dilute   Low concentration   Small amount of solute

  Tasteless Kool-aid

What is concentration?   Concentration is measured in…

  grams per liter (g/L)   the # of grams of solute in one liter of solvent

  Example: Salt water   50g of NaCl (salt)   1L of H2O (water)

mass

volume

Examples 1.  If 50g of NaCl is dissolved in 1L of H2O, what is the

concentration of the solution in g/L?

50 g 1 L = 50 g/L

mass

volume

Examples 2.  If 50g of NaCl is dissolved in 1L of H2O, what is the

concentration of the solution in g/L?

50 g 2 L = 25 g/L

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 L = 30g 1 L x 1 X 30 g

1 =

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 1 L = 90g 3 L x 3 X 30 g

1 =

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

If 100g of NaCl is dissolved in 1L of H2O, what is the

concentration of the solution in g/L?

What is the concentration of the solution in g/L if If

100g of KBr is dissolved in 10L of H2O?

How many grams of sugar are there in a 1L solution of

Kool-aid that has a concentration of 6g/L?

How many grams of CO2 are there in a 2L bottle of

Sprite that has a concentration of 2g/L?

How many grams of CO2 are there in a .5L bottle of Diet

Coke that has a concentration of 20g/L?

Practice Questions   Practice question worksheet

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.

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.

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

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

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

Homework   Finish practice questions