Welcome to Chemistry I Chemistry I 1814 Objectives

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 cardiff. ac. uk bio-technologies. info txstate. edu bsmommy. wordpress. com internetapplicants. pbworks. 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 Rules 1. 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 Actions What 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

Graphing Data Which quadrant did you use to graph the humming bird data? . math. about. com

Graphing Data

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.

Metric Conversions

Measurement Lab Purpose: 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

Scientific Notation • To abbreviate very large or small measurements.

Significant 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 1. All nonzero numbers 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 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. 02340 g = 4 sig. figs. Ex. 2, 340 g = 3 sig. figs.

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/Powerpoints 2. shtml

Calculating with Significant Figures