1 26 Unit #6 Exam Review
Transcript of 1 26 Unit #6 Exam Review
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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%!
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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%!
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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%!
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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
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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.
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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.
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Launch 1/26 5. How many times more
acidic is stomach acid than rainwater?
a. 4
b. 10000 c. 40000
d. 100000
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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
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January Calendar
Exam
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Unit #6 Review Mr. Heffner 1/26/10
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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
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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
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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!
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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…?
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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
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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
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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
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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”
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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
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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
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Review Worksheet Practice question worksheet
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Homework Finish practice questions