Welcome to Chemistry I

Chemistry I: 1/8/14 Objectives:

•Complete Student/Teacher Bios.

•Identify what chemistry is.

•Discuss Syllabus and Classroom Expectations

•Discuss and apply Lab Safety Rules

Homework:

•Review with parents, sign, and return tomorrow.

•Complete lab safety assignment.

•Lab Safety Test-Friday

Student’s Bio

1. What was your last science and math course and what grades did you earn?

2. What is your strongest subject? Weakest subject?

3. Do you have access to a computer at home?

4. What are your hobbies and interests?

5. Do you have an afterschool job? If so, where?

6. What kind of career are you interested in pursuing?

Ms. Leeper’s Bio

txstate.edu

bio-technologies.info

cardiff.ac.uk

bsmommy.wordpress.com

internetapplicants.pb

works.com

What is chemistry?

What is chemistry?

•Study of Matter

-Identify and classify matter based on its composition/make-up.

-Analyze the chemical and physical changes of matter.

What does all matter have in common?

Elements: Different Atoms

Classification of Matter

Elements: Different Atoms

Let’s Get Creative!

• How many of your unique characteristics can be spelled out using the elements’ symbols from the periodic table.

Ex. Ms. Leeper’s Characteristics

Occupations requiring Chemistry

• Nurse• Culinary artist• Psychologist• Elementary teacher • Tattoo artist• Physical Therapist• Veterinarian• Neurologist• Farmer• Graphic Artist• Cinematographer• Archaeologist

Chemistry I: 1/10/14 Objectives:

•Discuss Syllabus and Classroom Expectations

•Discuss and apply Lab Safety Rules

• Address Scientific Skills Worksheet

Homework

•Syllabus signed and returned Monday

•Lab Safety Test-Monday

•Scientific Skills worksheet

Chemistry Syllabus

• Discuss Syllabus and Classroom Expectations

• Review with parents, sign, and return Monday.

Classroom Rules1. Students must be in class when the bell rings.

2. Bring all materials to class with you.

3. Students must raise hand before talking or getting up out of seat.

4. Assignments must be placed in tray when requested for full credit.

5. A hall pass must be used to leave class.

6. Food and bottled drinks must be disposed of properly before leaving class.

7. Electronic devices are only permitted for specific assignments.

8. Academic dishonesty will NOT be tolerated.

9. Students must follow lab procedures at all times.

Disciplinary ActionsWhat are the consequences of violating Ms. Leeper’s

rules? For most…

First Offense: Vebal warning

Second Offense: classroom referral, detention ( during lunch room or after school), and parent notification

Third Offense: Office referral and parent meeting.

Exceptions:

Academic dishonesty

Disposing of gum on furniture/equipment

Harmful or extremely disrespectful to peers/instructors.

Incompletion of pre-lab questions

Lab Safety

• Address and discuss lab safety rules.

• Watch lab safety video.

Chemistry I: 1/13/14 Due:

•Syllabus and Lab Safety sheet signed.

•Lab Safety Packet

•Humming Bird Graphing Assignment

Objectives:

•Lab Safety Test

•Address Scientific Skills Worksheet

•Measurement Lab

Homework:

•Scientific Skills Practice Problems

Experimental Variables• Independent variable

• Dependent Variable

Experimental Variables• Independent variable

- variable “I” control in the experiment.

- Always plot on x-axis

• Dependent Variable

- variable depends on the independent variable

- Always plot on y-axis

Chemistry I: 1/14/14

Infinite Campus Update:•Lab Safety Illustrations (10pts.)•Lab Safety Packet (16pts.)•Humming Bird Graphing Assignment (10pts.)

Due:•Conversions and Graphing Worksheet

Chemistry I: 1/14/14

Objectives: •I can graph and interpret data from an experiment. •I can make accurate measurements and conversions in the lab. •I can distinguish between qualitative and quantitative data. •I can distinguish between accurate and precise measurements.

Homework:•Complete Measurement Lab•Scientific Skills Practice Sheet

Graphing Assignment

Check for the following:• Title (specific to the expt.)• Labeled the x/y axis with correct data values

(Hint: Independent/Dependent)• Did they place the data in the correct quadrant? • Are the intervals on the x axis consistent? y-axis

consistent?• Did they plot using the appropriate graph?

(Hint: Line Graph)

Graphing Data

Graphing DataWhich quadrant did you use to graph the humming bird data?.

math.about.com

Types of Experimental Results

Qualitative Results: (quality)

Quantitative Results:(quantity)

Types of Experimental Results

Qualitative Results: (quality)• What we observe thru our senses. • What we see, smell, hear, or sometimes even taste.

Subjective data, questionable data.

Quantitative Results:(quantity)• Data involving numbers• Measurements or calculations for an experiment.

Definitive data, cannot argue with and so is the most important type of data collected by a scientists.

Analyzing Quantitative Data• Precision :

• Accuracy:

Accuracy vs. Precision• Accurate Results:

-Compare experimental data with the actual value.

-When experimental data is equal to the true value.

• Precise Results:

- Comparing experimental data from several trials or from different lab groups in a class.

-When experimental data is similar to one another.

Accuracy vs. Precision

• Explain what analogy (including an illustration) you would use to help a friend understand the difference between accuracy and precision.

Measurement Conversions-Key1. a. 0.35dL b. 0.935kg c. 1.000kL

d. 4.5 g e. 250 mm f. 7.5 cm

g. 15,000 mg h. 0.5 dkg

2. a. 40.1 cm b. 0.6 m c. 21,600s

d. 21,900 hrs. e. 15.2 lbs. f. 30.6m

Measurement Conversions

Chemistry I: 1/15/14 Objectives:• I can make accurate measurements and conversions in the lab. •I can write and interpret measurements in scientific notation. •I can graph and interpret data from an experiment. •I can distinguish between qualitative and quantitative data. •I can distinguish between accurate and precise measurements.

Homework:•Scientific Skills Practice Sheet•Review Notes-Quiz Tomorrow

Measurement LabPurpose: To practice making accurate measurements and

apply appropriate conversions.

Check-up: • Are you making accurate measurements? (certain

numbers plus the first estimated number)• Does your measurement include units? (no negate

numbers!)• Are you showing work when you make conversions with

your units? If multiple steps, write out a plan.• Circle answer from conversion and make sure it has units.

Ex.

Measurement LabPurpose: To practice taking correct measurements and

apply appropriate conversions.• Every measurement has some degree of uncertainty.

Depends upon the instrument used. • Determine the correct measurement for the length of

paper for Ruler A and Ruler B:

Measurement LabPurpose: To practice taking correct measurements and

apply appropriate conversions.• Every measurement has some degree of uncertainty.

Depends upon the instrument used. • Determine the correct measurement for the length of

paper for Ruler A and Ruler B:

Metric Conversions

Metric to English Conversions

Chemistry I: 1/16/14 Objectives:•Scientific Skills Quiz•I can express and interpret measurements in scientific notation. •I can identify significant figures in a measurement and understand their importance in the lab. (Sig. Fig. Lab)•I can make accurate measurements and conversions in the lab.•I can graph and interpret data from an experiment.

Homework:•Scientific Skills Review worksheet•Significant Figures worksheet/lab

Scientific Skills

• When complete quiz, place in tray.

• Work quietly on Scientific Skills Review Sheet.

Scientific Notation• A way to abbreviate very large or small

measurements.

Ex. The Earth is 92,960,000 miles from the sun.

Ex. The approximate diameter of a carbon atom is 0.000000022 cm.

Density

• How do we calculate density?

Chemistry I: 1/17/14 Objectives:•I can identify significant figures in a measurement and understand their importance in the lab. •Complete Significant Figures Lab•I can express and interpret measurements in scientific notation. •I can make accurate measurements and conversions in the lab.•I can graph and interpret data from an experiment.

Homework:•Scientific Skills Review worksheet•Significant Figures worksheet/lab

Scientific Skills Quiz

Significant Figures LabPurpose:

To identify significant figures in a measurement and to understand the importance of them in the lab.

Significant FiguresSignificant Figures:

• The numbers directly related to an object’s measurement.

• Place holders are NOT significant figures.

Importance of significant figures?

• Determines the degree of accuracy for a measurement.

Significant Figures in Measurements

Significant Figures in Measurements1. All non-zero numbers (1-9) are significant.

Ex. 234 g = 3 significant figures (sig. figs)

2. Zeros in between nonzero numbers are significant. Ex. 2,034 g = 4 sig. figs.

3. Leading zeros (come before non-zero numbers) are NOT significant. Only serve as placeholders. Ex. 0.0234 = 3 sig. figs

4. Trailing zeros (come after non-zero numbers) are significant IF there is a decimal point in the measurement.

Ex. 0.02340g = 4 sig. figs.

Ex. 2,340 g = 3 sig. figs.

Chemistry I: 1/24/14 Due:

•Significant Figures Lab

Objectives:•I can identify significant figures in a measurement and understand their importance in the lab. •When calculating with measurements, I can express an answer with correct number of significant figures.• I can make accurate measurements and conversions in the lab.•I can express and interpret measurements in scientific notation. •I can graph and interpret data from an experiment.

Unit Conversions1. Identify what conversion(s) you will need. Come up

with a game plan.

2. Label each conversion. Step 1, 2, 3, etc.

3. For each conversion:

a. Write down what you are given

b. Add a multiplication symbol, x

c. Next draw a line and place parenthesis around it.

This is the conversion fraction- where conversion will go.

d. The unit you want to convert to goes on top of the line, the unit you want to cancel goes under the line. Include numbers associated with the conversion.

e. Calculate- start with what is in parenthesis first.

f.Don’t forget to include units with answer for full credit.

Metric to Englishk h dk base d c m• Convert 4 lbs. to mg? (lbs. = pounds)

Significant Figures

• Check worksheet and lab.

• Work on post-lab questions.

Significant FiguresSignificant Figures:

• The numbers directly related to an object’s measurement.

• Place holders are NOT significant figures.

Importance of significant figures?

• Determines the degree of accuracy for a measurement.

Calculating with Measurements• “Your only as good as your weakest link.”

• An answer from a calculation involving measurements, can only be as accurate (good) as the weakest measurement in the calculation.

Calculating with Significant Figures

1. Multiplying and Dividing:The # of sig. figs. in the answer must be equal to

the # of sig. figs. in the weakest (least accurate) measurement.

2. Addition and Subtraction:The # of decimal places in the answer must be

equal to the # of decimal places in the weakest measurement (least accurate).

http://www.sciencegeek.net/Chemistry/Powerpoints2.shtml

Calculating with Significant Figures

Chemistry I: 1/27/14 Due:

•Unit Conversion Lab

•Calculating Significant Figures worksheet

Objectives:•I can identify significant figures in a measurement and understand their importance in the lab. •When calculating with measurements, I can express an answer with correct number of significant figures.

Homework:•Complete Significant Figures Lab-post lab qts. •Complete Density Lab-post lab qts.

Significant Figures Lab

• Complete pre-lab questions dealing with Metric-English conversions and place in tray. *Remember to show work for full credit. !

Unit Conversions1. Identify what conversion(s) you will need. Come up

with a game plan.

2. Label each conversion. Step 1, 2, 3, etc.

3. For each conversion:

a. Write down what you are given

b. Add a multiplication symbol, x

c. Next draw a line and place parenthesis around it.

This is the conversion fraction- where conversion will go.

d. The unit you want to convert to goes on top of the line, the unit you want to cancel goes under the line. Include numbers associated with the conversion.

e. Calculate- start with what is in parenthesis first.

f.Don’t forget to include units with answer for full credit.

Significant Figures Review

How many significant figures are in each measurement?

a. 0.054g

b. 2.205 g

c. 2,000g

d. 2.0300g

Calculate using the correct number of significant figures?

a. 4.025g x 0.052g x 9.20g =

Calculating with Measurements• “Your only as good as your weakest link.”

• An answer from a calculation involving measurements, can only be as accurate (good) as the weakest measurement in the calculation.

Calculating with Significant Figures

1. Multiplying and Dividing:The # of sig. figs. in the answer must be equal to

the # of sig. figs. in the weakest (least accurate) measurement.

2. Addition and Subtraction:The # of decimal places in the answer must be

equal to the # of decimal places in the weakest measurement (least accurate).

http://www.sciencegeek.net/Chemistry/Powerpoints2.shtml

Density Lab

Chemistry I: 1/28/14 Due:

•Density Lab

Objectives:•I can identify significant figures in a measurement and understand their importance in the lab. •When calculating with measurements, I can express an answer with correct number of significant figures.

Homework:•Complete Significant Figures Lab-post lab qts. •Complete Density Lab-post lab qts.

Density Lab: Class’s AnalysisLab Group Density (g/mL) Lab Group Density (g/mL)

1 10

2 11

3 12

4 13

5 14

6 15

7 16

8 17

9 18

Scientific Skills Review

• Exam will be Thursday

• Gallery Walk Review (Tues./Wed.)