Chem II-Period: 8.7.14
Due:
• Syllabus and Lab Safety Contract Signed
Objectives:
• Student/Teacher Bio
• Review Syllabus and Safety Lab Procedures
• Collect/Check-Off Lab Equipment at Benches
Homework:
• Review Lab Safety Rules-test tomorrow
• Review Ion Nomenclature
Chem II: Student’s Bio
1.
What was your last science and math course and what
grades did you earn?
2. When did you take Chem I? Who was your instructor?
3. What is your strongest subject? Weakest subject?
4. Do you have access to a computer at home?
5. What are your hobbies and interests?
6. Do you have an afterschool job? If so, where?
7. What kind of career are you interested in pursuing?
Ms. Leeper’s Bio
cardiff.ac.uk
bio-technologies.info
txstate.edu
bsmommy.wordpress.com
internetapplicants.
pbworks.com
Chem II-Period: 8.8.14
Due:
• Syllabus and Lab Safety Contract Signed
Objectives:
• Lab Safety Quiz
• Science Reflection Article
• Scientific Measurement Practice Problems
Homework:
• Annotate Science Reflection Article
• Work on Scientific Measurement Practice Packet
Professions Dependent Upon Chemistry
Pediatrician
Military
Dentist/Dental Hygenist
Archaeologist(Historian)
Pharmacist
Biologist
Nurse
Historian
Speech Therapist
Gynecologist
Teacher
Engineer(Chemical)
Chemist(Nuclear)
Business Manager
Child Psychologist
Cosmetology
Physical Therapist(Sports Medicine)
Computer Science
Lab Safety Rules
• Address any questions about the rules.
(Safety Lab Packet B-C).
Ebola Therapy Article
• Annotate article and write down questions
that you have as you read the article.
• Due Monday (8.11)
Scientific Measurement Review
• Review scientific measurement concepts
by completing packet.
• Scientific Measurement ppts. on my
webpage if needed.
• Due Tuesday(8.12)
Pre-Lab Questions
Significant Figures in Measurements
1. All nonzero numbers are significant.
Ex. 234 g = 3 significant figures (sig. figs)
1. Zeros in between nonzero numbers are
significant. Ex. 2,034 g = 4 sig. figs.
3. Leading zeros are NOT significant. Only serve
as placeholders. Ex. 0.0234 = 3 sig. figs
4. Trailing zeros are significant IF they have a
decimal point in the measurement.
Ex. 0.02340g = 4 sig. figs.
Calculating Measurements
• When calculating with measurements your answer to
such calculations can only be as good as your
weakest measurement.
1. Multiplying and Dividing:
The # of sig. figs. in the answer is the same as the
measurement with the least number of significant
figures.
2.2 g x
0.430 g = 0.95 g
(2sig. Figs) (3 sig. figs.) answer: 2 sig figs.
2. Addition and Subtraction:
The # of decimal places in the answer is the same as the
measurement with the least number of decimal places.
3.20 g +
0.286 g = 3.49g
(2 decimal (3 decimal (answer: 2 decimal
places)
places)
places
*.
Accuracy vs. Precision
Precise Results:
• When experimental results from different trials
are close to one another.
• Accurate Results:
When the experimental results’ average is close
to the actual value.
http://www.mhhe.com
Metric Conversions
Common Measurement Conversions
1 yard = 36 in
454 g = 1 lb.
2.54cm = 1 in.
2,000 lbs. = 1 t
60 s = 1 min
60 min = 1 hr
1L = 1.06 qts
4qts = 1 gal
1mol = 22.4L
16oz. = 1lb.
1ft = 12in
1 L = 1dm3
1 mL = 1cm3
1 m = 1.09 yd
1 km = 0.62 mi
1 mi = 5280 ft
1760yd = 1mi.
K = oC+ 273
oC = 5/9(oF - 32)
1.38 acres= 60,000 ft2
Chem II-Period: 8.11.14
Infinite Campus Update:
• Lab Safety Exam (34pts.)
Due:
• Syllabus and Lab Safety Contract Signed from a few.
• Ebola Therapy annotation/qts.
• Prepared for Density Lab
Reminders:
• Scientific Measurement Packet-due Wed.
• Ebola Therapy annotation/review qts.-due Fri.
Objectives:
• Density Lab pre-lab qts./procedures
• Scientific Measurement Review
A safe and productive classroom looks like….
Chem II-Period: 8.12.14
Due:
Density Lab Pre-Lab Qts.
Reminders:
• Scientific Measurement Packet-Due Wed.
• Ebola Therapy annotation/review qts.-Due Fri.
Objectives:
• Scientific Measurement Review (distribute resources)
• Density Lab
Homework:
Scientific Measurement Review Packet
Scientific Measurement Review
Density Lab: Pre-Lab Qts.
Density Lab
• Purpose: To review scientific measurement
concepts.
• Complete pre-lab questions and develop
procedures prior to starting lab.
• While performing experiment, document all
data(qualitative and quantitative).
• Goggles must be worn at all times.
• Complete post-lab questions.
• Classroom Analysis of data.
• Each student will turn in a lab report.
Chem II-Period: 8.13.14
Due:
Scientific Measurement Packet
Reminders:
• Ebola Therapy annotation/review qts.-due Monday
Objectives:
• Scientific Measurement Review
• Density Lab Procedures/Experiment
Homework:
Scientific Measurement Review
• Quiz on Monday
Density Lab
• Purpose: To review scientific measurement
concepts.
• Complete pre-lab questions and develop
procedures prior to starting lab.
• While performing experiment, document all
data(qualitative and quantitative).
• Goggles must be worn at all times.
• Complete post-lab questions.
• Classroom Analysis of data.
• Each student will turn in a lab report.
Chem II-Period: 8.14.14
Due:
Scientific Measurement Packet
Reminders:
• Ebola Therapy annotation/review qts.-due Monday
Objectives:
• Scientific Measurement Review
• Density Lab Experiment
Homework:
• Graph Group’s Data: Density vs. Concentration
Density Lab
• Purpose: To review scientific measurement
concepts.
• Complete pre-lab questions and develop
procedures prior to starting lab.
• While performing experiment, document all
data(qualitative and quantitative).
• Goggles must be worn at all times.
Chem II-Period: 8.15.14
Infinite Campus Update:
Scientific Measurement Review Pkt.(14)
Objectives:
• Scientific Measurement Review
• Density Lab Experiment and Analysis
Homework:
• Complete group’s data/analysis sections-due Mon.
• Annotation/review qts.-due Monday
• Review scientific measurement concepts-Quiz Tues.
Scientific Measurement Review
Density Lab: Data/Analysis
•
•
•
•
Known % concentration soln.: (0,5,10,15,20,25)
Careful not to cross-contaminate solutions.
Take/record accurate measurements for vol/mass.
Express density values to the correct degree of
accuracy.
Chem II-Period: 8.18.14
Due:
• Density Lab: group’s data and analysis sections
• Ebola Article and Review Qts.
Objectives:
• Discussion of Ebola Article
• Density Lab: Analyze class’s data
Homework:
• Scientific Measurement Quiz
• Class’s data and analysis sections
Ebola Therapy Discussions
• Group Discussion Qts. :
*Pair up with two other people and discuss qts.
each of you came up with while annotating.
Record three qts. your group thinks would be
valuable to share with the class. Include answer
or research answer via phone.
Lab Report Format
• Purpose:
What was the point of the lab?
• Materials:
What did you use to complete lab?
• Procedures:
What steps did you take to complete the lab?
• Data:
Qualitative and quantitative data from lab group and
classroom. Quantitative data needs to be organized in
charts/tables/graphs.
• Analysis/Conclusion:
Analysis of data by answering post-lab questions using
complete sentences organized into a few paragraphs.
Chem II-Period: 8.19.14
Due:
• Density Lab: group’s data and analysis sections
Objectives:
• Scientific Measurement Quiz
• Density Lab: Complete lab and analyze data
Homework:
• Density Lab: Complete data/analysis sections
Chem II-Period: 8.20.14
Due:
• Density Lab: group’s data and analysis sections
Objectives:
• Density Lab: Analyze Data (Group/Class)
• Composition of Matter Graphic Organizer
Homework:
• Density Lab Report-Due Friday
• Composition of Matter Graphic Organizer-Due Thurs.
Graphing Calculator: Analysis
• Follow instructions for retrieving analysis
from calculator
• Linear regression equation: y=ax+b
(slope equation)
a= 0.007371
b= 0.9662
r2= 0.6854
r= 0.8279
Lab Report Format
• Purpose:
What was the point of the lab?
• Materials:
What did you use to complete lab?
• Procedures:
What steps did you take to complete the lab?
• Data:
Qualitative and quantitative data from lab group and
classroom. Quantitative data needs to be organized in
charts/tables/graphs.
• Analysis/Conclusion:
Analysis of data by answering post-lab questions using
complete sentences organized into a few paragraphs.
Density Lab: Class’s Data
O%
Density
5%
Density
10%
Density
15%
Density
20%
Density
25%
Density
Unkwn
1
Density
Unkwn
2
Density
Grp 1
Grp 2
Grp 3
Grp 4
Grp 5
Grp 6
Grp 7
Grp 8
Avg.
Class’s Data Analysis Qts.:
1. Are the class’s density values precise? Explain your answer.
2. Calculate the class’s average density values and plot on graph with concentration.
3. According to the class’s average data, what is the % concentration of each
Unknown?
4. Is the class’s data accurate? Explain by calculating % error of concentration for
each unknown. Is the class’s % error better than your group’s % error? Explain.
Graphing Calculator: Analysis
• Follow instructions for retrieving analysis
from calculator
• Linear regression equation: y=ax+b
(slope equation)
a= 0.007371
b= 0.9662
r2= 0.6854
r= 0.8279
Classification of Matter: Graphic Organizer
•
•
•
•
•
•
•
•
•
•
•
Matter
Intramolecular Forces
Substances
Energy(Endo/Exo processes)
Mixtures
Solutions
Elements
Colloids
Compounds
Suspensions
Homogenous Mixtures
Heterogenous Mixtures
Subatomic particles (protons, neutrons, electrons)
Chemical Changes
Physical Changes
Intermolecular Forces
Chem II-Period: 8.21.14
Infinite Campus Update:
• Scientific Measurement Review Quiz(14pts.)
• Ebola Therapy Article (15pts.)
Due:
• Classification of Matter Graphic Organizer
Objectives:
• Density Lab: Analyze Data (Group/Class)
• Classification of Matter Graphic Organizer
Homework:
• Density Lab Report-Due Friday
Classification of Matter
Graphic Organizer
Scientific Measurement Review Quiz
Chem II-Period: 8.22.14
Objectives:
• Density Lab: Actual concentration values of unknown!
• Classification of Matter Graphic Organizer
• Classification of Mixtures
Homework:
• Density Lab Report-Due Monday
Density Lab Report Format
• Heading for each section of lab report.
• Data section should include table/handgraph/slope equation from calculator for
group AND class’s data.
• Analysis: In paragraph form, ALL post lab
questions should be addressed. You
determine the organization of answers for
this section.
Lab Report Format
• Purpose:
What was the point of the lab?
• Materials:
What did you use to complete lab?
• Procedures:
What steps did you take to complete the lab?
• Data:
Qualitative and quantitative data from lab group and
classroom. Quantitative data needs to be organized in
charts/tables/graphs.
• Analysis/Conclusion:
Analysis of data by answering post-lab questions using
complete sentences organized into a few paragraphs.
Density Lab: Class’s Data
O%
Density
5%
Density
10%
Density
15%
Density
20%
Density
25%
Density
Unkwn
1
Density
Unkwn
2
Density
Grp 1
Grp 2
Grp 3
Grp 4
Grp 5
Grp 6
Grp 7
Grp 8
Avg.
Class’s Data Analysis Qts.:
1. Are the class’s density values precise? Explain your answer.
2. Calculate the class’s average density values and plot on graph with concentration.
3. According to the class’s average data, what is the % concentration of each
Unknown?
4. Is the class’s data accurate? Explain by calculating % error of concentration for
each unknown. Is the class’s % error better than your group’s % error? Explain.
Graphing Calculator: Analysis
• Follow instructions for retrieving analysis
from calculator
• Linear regression equation: y=ax+b
(slope equation)
a= 0.007371
b= 0.9662
r2= 0.6854
r= 0.8279
Chem II-Period: 8.25.14
Due:
• Density Lab Report
Objectives:
• Tweak Classification of Matter Graphic Organizer
• Classification of Mixtures Lab
Homework:
• Classification of Mixture Lab-I.D. with asterisk which
mixtures were challenging to classify.
• Distinguish between Molarity and Molality
Classification of Matter: Graphic Organizer
•
•
•
•
•
•
•
•
•
•
•
Matter
Intramolecular Forces
Substances
Energy(Endo/Exo processes)
Mixtures
Solutions
Elements
Colloids
Compounds
Suspensions
Homogenous Mixtures
Heterogenous Mixtures
Subatomic particles (protons, neutrons, electrons)
Chemical Changes
Physical Changes
Intermolecular Forces
Classification of Mixtures: Graphic Organizer
Chem II-Period: 8.26.14
Due:
• Density Lab Report-LATE
Objectives:
• Classification of Mixtures Lab
• Distinguish between Molarity vs. Molality
Classifying Mixtures
Pre-Lab qts.:
1. Distinguish between solutions, colloids,
and suspensions and give an example of
each.
2. What separation technique would you
use to separate substances from each
type of mixture?
Classification of Mixtures Lab
• Classify the mixtures as either a solution,
colloid, or suspension.
• After classifying them, highlight samples that
were challenging to classify. Which classes of
mixtures are represented in these selected
samples?
• What test would scientists use to distinguish
between these two classes of mixtures. How
does it work?
Classifying Mixtures
Chem II-Period: 8.27.14
Due:
• Mixture Lab Questions
• Distinguish b/w Molarity vs. Molality
Objectives:
• Complete classification of mixtures lab.
• Distinguish between Molarity and Molality of solutions.
Homework:
• Molarity vs. Molality practice problems-due Thurs.
• Establish procedures for Molarity vs Molality lab.
Classification of Mixtures Lab
• Classify the mixtures as either a solution,
colloid, or suspension.
• After classifying them, highlight samples that
were challenging to classify. Which classes of
mixtures are represented in these selected
samples?
• What test would scientists use to distinguish
between these two classes of mixtures. How
does it work?
Molarity vs. Molality of Solutions
Chem II-Period: 8.28.14
Due:
• Molarity vs. Molality word problems
Objectives:
• Distinguish between Molarity and Molality of solutions.
(word problems/lab)
Homework:
• Establish procedures for Molarity vs Molality lab.
• Scientific Review-molarity vs. molality problems
Concentration of Solutions
Molarity vs. Molality Problems
Molarity vs. Molality Lab
• Complete word problems.
• Establish procedures for lab.
Chem II-Period: 8.29.14
Due:
• Molarity vs. Molality Problems
Infinite Campus Update:
• Classification of Mixture Lab (10pts.)
Objectives:
• Distinguish between Molarity and Molality of solutions.
(Molarity vs. Molality Lab)
Homework:
• Complete post-lab qts. From lab.
• Scientific Review-complete problems we have
addressed.
Chem II-Period: 9.2.14
Due:
• Molarity vs. Molality Problems
Objectives:
• Distinguish between Molarity and Molality of solutions.
(Molarity vs. Molality Lab)
• Distinguishing between ionic and covalent compounds
Homework:
• Complete post-lab qts. From lab.
• Scientific Review-complete problems we have
addressed.
• Venn Diagram for ionic and covalent compound
Molarity vs. Molality Lab
Chem II-Period: 9.3.14
Due:
• Molarity vs. Molality Lab
• Venn diagram for ionic and covalent compounds.
Objectives:
• Distinguish between concentration of solutions.
(Molarity vs. Molality)
• Distinguish between dissolving and dissociation of
solutes in a solution.
• Classify compounds as either ionic, covalent, acidic,
or basic.
*Quiz tomorrow over mixtures including Molarity and
Molality.
Molarity vs. Molality Problems
Solutions: Electrical Conduction
• Predict which solutions will conduct
electricity. Explain how you know this.
a. sugar solution (C12H22O11+ H2O)
b. Salt solution (NaCl + H2O)
c. Vinegar (HC2H3O2 + H2O)
Solutions: Electrical Conduction
• Predict which solutions will conduct
electricity. Explain how you know this.
a. sugar solution (C12H22O11+ H2O)
b. Salt solution (NaCl + H2O) metal ion
c. Vinegar (HC2H3O2 + H2O) H+ ion
• Illustrate why some solutions conduct
electricity and why others’ do not?
Solutions: Electrical Conductions
• Website that illustrates electrical conduction in
solutions.
• https://phet.colorado.edu/simulations/sims.php
Chem II-Period: 9.4.14
Due:
• Distinguish between dissolving and dissociation of
solutes in a solvent.
Objectives:
• Mixtures and Concentration of Solution Quiz
• Distinguish between dissolving and dissociation of
solutes in a solution.
• Factors that affect the solubility rate of solutes in a
solution.
Homework:
• Complete Scientific Skills and Matter Review-Test Mon.
Dissolving vs. Dissociation
What is the difference between dissolving
and dissociation?
Salt Solution
Cl-
Na+
C
Cl-
Na+
Sugar Solution
H
O
11 12 11
C
Na+
C
Cl-
Na+
Na+
H O
11 12 11
H
O
11 12 11
C
Cl-
H
O
11 12 11
Solutions: Dissolving
• A solute is soluble in a solvent.
• Three degrees of solubility:
SUGAR SOLUTION
*unsaturated solutions
C
*saturated solutions
C
H
O
11 12 11
H
O
11 12 11
C
*supersaturated solutions
C
H
H
O
11 12 11
O
11 12 11
Solutions: Dissociation
•
A solute breaks up into ions when soluble
(dissolves) in a solvent.
Salt Water
Cl-
Na+
Cl-
Na+
Na+
Cl-
Na+
Na+
Cl-
Dissolving vs. Dissociation
Salt Water
Sugar Water
DISSOLVES AND DISSOCIATES
DISSOLVES ONLY
C
ClNa+
Na+
Cl-
Na+
Na+
C
O
11 12 11
H O
11 12 11
C
Na+
ClCl-
C
H
H
O
11 12 11
H
O
11 12 11
Conclusion:
Which class of compounds will dissociate when dissolved in a solvent?
•
•
•
7.2
When solutes dissociate in water they are able to
conduct electricity.
These solutes are ionic compounds or acids/bases.
These solutes are also called electrolytes.
Acids and Bases
academic.cuesta.edu
Acids and Bases
dissociation
(HCl)
dissociation
(NaOH)
http://wikis.lawrence.edu/display/CHEM/Acids+and+Bases-Davis
Acids and Bases
Cl
Cl
Cl
Cl
Na
Na
Na
Na
http://www.chem4kids.com/files/react_acidbase.html
• Acids and bases dissociate in water.
• Strong acids/bases dissociate best in H2O.
(strong electrolytes)
• Weak acids and bases dissociate poorly in H2O
(weak electrolytes)
Factors that affect Solubility
• What factors do you think affect the rate at
which a solute dissolves in a solvent?
Scientific Skills and Matter
Gallery Walk