1 26 unit #6 exam review
TRANSCRIPT
Launch: 1/26 Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions on your desk.
Yesterday’s Exit Slip Data:
Today’s Objective: Review!
95%!
Launch: 1/26 Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions on your desk.
Yesterday’s Exit Slip Data:
Today’s Objective: Review!
93%!
Launch: 1/26 Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions on your desk.
Yesterday’s Exit Slip Data:
Today’s Objective: Review!
99%!
Launch: 1/26 Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions on your desk.
Yesterday’s Exit Slip Data:
Today’s Objective: Review!
N/A
Launch 1/25
1. pH is a measure of a. the taste of an acid or a base. b. the ability of a solute to dissolve in solution.
c. the concentration of H+ ions in solution. d. the strength of an ion in solution.
Launch 1/26 3. Of the four different laboratory solutions below,
the solution with the highest acidity has a pH of a. 11. b. 7. c. 5.
d. 3.
Launch 1/26 5. How many times more
acidic is stomach acid than rainwater?
a. 4
b. 10000 c. 40000
d. 100000
Announcements Unit #6 Exam on Thursday!
No notecard! Ask questions
Work with purpose
2 review days Today is super important – study guide
Double points!
Tomorrow jeopardy
Class rules I am focusing on this week: interfering with your own or someone else’s learning
leaving seat without permission
January Calendar
Exam
Unit #6 Review Mr. Heffner 1/26/10
Review: Solutes vs. Solvent A solution is a homogeneous mixture made up of a…
Solute is dissolved solid (or gas)
molecules don’t move Example:
Solvent does the dissolving liquid
molecules randomly collide Example:
more
Review: How are solutes dissolved? The dissolving process:
1. The solvent randomly collides with solute 2. The solvent overcomes the attraction between solute
3. The solvent surrounds the solute
Review: What is solubility? Solubility is..
how well a solute dissolves in a solution.
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
more SA less SA
opposite!
Review: Concentration Calculations Concentration is…
the amount of solute in a solution. g/L, mol/L (M), or ppm
There is a 3 step process for calculating concentration: 1. Look at the ending unit 2. Decide whether to multiply or divide
mol/L (molarity) or g/L divide
moles or grams multiply
3. Cancel units and do the math!
How many…? or
What is…?
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
grams divided by liters
Examples 2. How many moles of NaOH are needed to prepare 2.0 L of
a 2 M solution?
2 mol 1 L = 4 mol 2 L x 2 X 2 mol
1 =
2 M = 2 mol/L
Examples 3. A solution of salt water contains 15 grams of salt per
1,000 grams of water. What is the concentration in parts per million (ppm)?
15 1000 = ?
1000000
15 1000 = 15
1000000 000
15,000ppm
Review: What are acids and bases? Solutions can be classified as…
Acids pH < 7 taste sour
burn skin turn litmus paper red donate H+ ions
Bases pH > 7 taste bitter
feel slippery turn litmus paper blue accept H+ ions
“pH scale”
Example 4. In the below chemical equation, identify the
reactant that acts like an acid and the reactant that acts like a base.
HF gives away an H+ (donates) = acid
H2O takes an H+ (accepts) = base
HF + H2O F- + H3O+
gives away an
H+
turns into takes an H+
turns into
Strong acids/bases
fully dissociate
Review: Strong vs. Weak
HCl H+ H+
H+ H+ H+
H+ H+ Cl-
Cl-
Cl-
Cl-
Cl-
Cl-
HCl H+ + Cl–
Weak acids/bases
partially dissociate
HF H+ + F–
HF
HF H+
HF HF H+
H+ HF F-
F-
F-
F-
F-
F-
strong acids and bases neutralize each other H2O + a salt
Review Worksheet Practice question worksheet
Homework Finish practice questions