Chemistry I: 8/12/13 Objectives: Turn lab safety illustration in tray. Bell Ringer: Classroom Rules/Discipline Address Lab Safety Rules. Homework: Look over lab safety rules. Complete lab safety scenarios. Lab Safety Test tomorrow.
Chemistry I: Bell Ringer What are Ms. Leeper’s classroom rules? If you disrupt class what are Ms. Leeper’s disciplinary actions? a. What does S.W.A.M.P stand for? b. Give an example of how you can implement each letter in Ms. Leeper’s class daily. *When completed place in appropriate tray.*
Classroom Rules Students must be in class when the bell rings. Bring all materials to class with you. Students must raise hand before talking or getting up out of seat. Assignments must be placed in tray when requested for full credit. A hall pass must be used to leave class. Food, drinks, and bottled water must be disposed of properly before leaving class. 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? First Offense: Vebal warning Second Offense: classroom referral, afternoon detention, and parent notification Third Offense: Office referral and parent meeting. Exception to step-by step consequences: Academic dishonesty Gum on furniture/equipment Extremely harmful disrespect and disregard to instructors/peers.
Chemistry I : Lab Safety Rules Discuss lab safety rules. Watch lab safety video clip. Complete lab safety scenarios. Lab Safety Test tomorrow.
Chemistry I: 8/13/13 Objectives: Turn in Safety Lab Illustration (deduction) Address Lab Safety Packet Watch Lab Safety Video Take Lab Safety Test Introduce Graduate Cylinder Lab Homework: Read Graduated Cylinder Lab
Chemistry: 8/14/13 Objectives: Measure, graph, and analyze data from graduated cylinder lab. Homework: Graph data from lab.
Chemistry I: 8/15/16 Objectives: Analyze data from graph. Address density Distinguish between accuracy and precision. Homework: Scientific Skills worksheet qts. 1
Interpreting Graphs: Slope Slope= rise/ run (y2-y1)/(x2-x1)
Chem I: 8/16/13 Objectives: Assess graphing techniques from homework Distinguish between accuracy and precision. Identify and apply significant figures in data analysis. Homework: Scientific Skills Worksheets (qts. 2-4 on front pg, front of second pg. )
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
Scientific Skills Graph With data from qts Scientific Skills Graph With data from qts. from scientific skills packet, we need to use quadrant IV’s set-up on our graph. math.about.com
Scientific Skills Graph
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 Usually measurements Definitive data, cannot argue with and so is the most important type of data collected by a scientist.
Analyzing Quantitative Data Precision : Accuracy:
Accuracy vs. Precision Accurate Results: When you compare your results with a true value. Precise Results: When you compare your experimental results with one another.
Significant Figures Significant Figures: Definite numbers plus the first estimated number in the measurement. The numbers must be directly related to the object’s measurement, not serve as placeholders. Importance of significant figures? Determines the degree of accuracy for a measurement.
Significant Figures in Measurements All nonzero numbers are significant. Zeros in between nonzero numbers are significant. 3. Leading zeros are NOT significant. Only serve as placeholders. 4. Trailing zeros are significant IF they have a decimal point in the measurement.
Significant Figures in Measurements All nonzero numbers are significant. Ex. 234 g = 3 significant figures (sig. figs) 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.
Significant Figures in Measurements All nonzero numbers are significant. Ex. 234 g = 3 significant figures (sig. figs) 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.
Chem I : 8/19/13 Objectives: Turn in graph from qts.one only. I can express measurements in scientific notation. I can determine the number of significant figures in a measurement. I can calculate using significant figures. Homework: Check Infinite Campus-updated grades. Complete Scientific Skills packet
ICP : 8/19/13 Objectives: Turn in graph from qts.one only. I can express measurements in scientific notation. I can determine the number of significant figures in a measurement. I can calculate using significant figures. Homework: Check Infinite Campus-updated grades Complete Scientific Skills packet.
Scientific Measurement: Bell Ringer What would be an example of a qualitative and quantitative observation from the experiment in qts. one. What is the density of carbon with a mass of 56.7 grams and a volume of 25.0 cm3 3. How many significant figures are in each measurement below: 0.0050 g. b.3,020g c. 8.060g d. 1.00x104 g 4. Express the following measurements in scientific notation. 300,000,000m/s (speed of light) 0.000000001m (equal to one nanometer)
Scientific Measurement: Bell Ringer What would be an example of a qualitative and quantitative observation from the experiment in qts. one. 2. What is the density of carbon with a mass of 56.7 grams and a volume of 25.0 cm3 3. How many significant figures are in each measurement below: 0.0050 g. b.3,020g c. 8.060g d. 1.00x104 g
Scientific Measurement: Bell Ringer 4. Express the following measurements in scientific notation. 300,000,000m/s (speed of light) 0.000000001m (equal to one nanometer)
Scientific Notation Scientific Notation To abbreviate very large or very small measurements. Move decimal point until measurement is between 1 and 10. standard measurements >1 have a positive exponent. standard measurements < 1 have a negative exponent. Ex. 5,000 g = 5.0x103 g 0.0456 m = 4.56x10-2 m
Chem I : 8/20/13 Objectives: I can calculate using significant figures. Introduce Measurement Lab Homework: Check Infinite Campus-updated grades. Bring calculators Complete Sig. Figs. Wksht Read thru and complete pre-lab qts. for lab.
ICP : 8/20/13 Objectives: I can calculate using significant figures. Introduce Measurement Lab Homework: Check Infinite Campus-updated grades. Bring calculators Complete Sig. Figs. Wksht Read thru measurement lab.
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 Sig. Figs. 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 Sig. Figs.
Chem I : 8/21/13 Objectives: Review Sig. Fig. calculations Complete Measurement Lab Homework: Complete post-lab questions. Review notes, wkshts., and bell ringer for quiz tomorrow.
Sig. Figs. and Measurements
Measurement Lab Purpose: Practice measuring (definite numbers plus first estimated number) Apply significant figures with measurements.
ICP : 8/21/13 Objectives: Review Sig. Fig. calculations Complete Measurement Lab Homework: Complete post-lab questions. Review notes, wkshts., and bell ringer for quiz tomorrow.
Measurement Lab Purpose: Practice measuring (definite numbers plus first estimated number) Apply significant figures with measurements.
Chem I: 8/22/13 Objectives: Bell Ringer: Scientific Notation and Sig. Figs. Analyze Measurement Lab Results I can convert between units in a measurement. Homework: Scientific Measurement Review Wksht. Scientific Measurement Quiz
Chem ICP: 8/22/13 Objectives: Bell Ringer: Scientific Notation and Sig. Figs. Analyze Measurement Lab Results I can convert between units in a measurement. Homework: Scientific Measurement Review Wksht. Scientific Measurement Quiz
Bell Ringer: Scientific Measurements 1. How many sig. figs are in each measurement below? 0.02050 g b. 1.04 x1028 Express the answer to the correct accuracy. 5.4 g + 3.24 g = b. 0.25g x 1.050g = 3. Convert each to scientific notation: a. 0.0035 mL b. 130,000 mi. 4. Convert each to standard notation: a. 5.4 x10-3 b. 8.2x105
Bell Ringer: Scientific Measurements 1. How many sig. figs are in each measurement below? 0.02050 g (4) b. 1.04 x1028 (3) Express the answer to the correct accuracy. 5.4 g + 3.24 g = 8.6g b. 0.25g x 1.050g =0.26g2 3. Convert each to scientific notation: a. 0.0035 mL = 3.5x10-3mL b. 130,000 mi.= 1.3x105 4. Convert each to standard notation: a. 5.4 x10-3 m = 0.0054m b. 8.2x105m = 820,000m
Measurement Lab Analyze Data: Does your quantitative data prove that the best instrument yields the most accurate measurement (most sig. figs)? If not you need to re-check your measurements in the lab.
Metric Conversions
Chem I: 8/23/13 Objectives: Scientific Measurement Quiz Analyze Measurement Lab Results I can convert between units in a measurement. Homework: Scientific Measurement Review Wksht.
Chem I: 8/23/13 Objectives: Scientific Measurement Quiz Measurement Lab I can convert between units in a measurement. Homework: Post Lab questions Scientific Measurement Review Wksht.
Metric to English k h dk base d c m a. How many meters are in a 100 yard football field? How many centimeters are in 2 feet ? c. Convert 4 pounds (lbs.) to milligrams?
Metric to English k h dk base d c m d. Convert 15 kilometers to miles.
Scientific Measurement Conversions
Chem I: 8/26/13 Objectives: Turn in Measurement Lab with post-lab qts. Evaluate Scientific Measurement Quiz Measurement Conversion Lab Homework: Scientific Measurement Review Wksht. Scientific Measurement Test (Wed.)
Chem I: 8/26/13 (3rd ) Objectives: Assess and complete Measurement Lab Evaluate Scientific Measurement Quiz Measurement Conversion Lab Homework: Scientific Measurement Review Wksht. Scientific Measurement Test (Wed.)
ICP: 8/26/13 Objectives: Turn in Measurement Lab with post-lab qts. Evaluate Scientific Measurement Quiz Measurement Conversion Lab Homework: Scientific Measurement Review Wksht. Scientific Measurement Test (Wed.)
Scientific Measurement Review
Scientific Measurement Review Gallery Walk Review: Independent vs. Dependent Variable Graphing Techniques Density Qualitative vs. Qualitative Data Accuracy vs. Precision Significant Figures (measurement/calculations) Measurement conversions (metric/english)