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Unit 0: Units, Metric Conversions and the Scientific Method

Sept. 17-21
by

Lakshmi Ramachandran

on 2 October 2012

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Transcript of Unit 0: Units, Metric Conversions and the Scientific Method

Week of Sept. 17-24;
Scholarly Trait: Active Listening Unit 0: Units, Measurement, Conversions and the Scientific Method Catalyst (Do Now): Fill in the following scenario with the correct units.

After sleeping for 7 ___(1)___, Sandra jumped out of bed since she was already 14___(2)___ late. It was 7:44am and she was planning to wake up at 7:30am. She quickly changed, brushed her teeth and jumped in her car, which wouldn't start. She tried getting her sister to start it while she attempted to push it forward, but realized that her measly 110___(3)___ self could not push the 1 ___(4)___ car. When she finally got it started, she realized her gas tank was empty so stopped by the nearest gas station to fill it with 12 ___(5)___ of gas. From there, she drove 8 ___(6)___ to school and ran to her first class. What a crazy morning! Units and Measurement Quote of the Day: “In wisdom gathered over time I have found that every experience is a form of exploration.” Ansel Adams Sept. 17 - Daily News Artifact (DNA): "University of Cape Town Researchers believe they've found a single dose cure for malaria" - Announced by researchers working on a class of drugs called aminopyridines, this multidrug treatment was found to kill malaria parasites instantly when tested in over 18 months of trials. The added benefit: no adverse side effects. Further testing will be conducted to introduce this drug to the international market. - National Geographic http://newswatch.nationalgeographic.com/2012/08/29/university-of-cape-town-researchers-believe-they-have-found-a-single-dose-cure-for-malaria/ Accuracy: The correctness of a measurement against the true value.

Precision: How well data agrees with other trials in an experiment. How accurate are you? Accuracy vs. Precision QuickJot (1min)
Which one is more "accurate? Why? Mission: "Measurement Madness" Tools: Beakers and Graduated Cylinders
Unit: mL
How to use: look at the bottom of meniscus (curve of liquid) Volumes Tools: Ruler and Meter Stick
Units: mm, cm, m (don't use inches in science)
How to use: measure from tip to tip, as specifically as possible. Lengths Masses Tools: Balance/Scale
Units: grams, milligrams

How to use: for powders, use a weighing boat. Place the boat on the scale first to "tare" or "zero" it, then add the solid. (don't use pounds (lbs) in science) - There will be 3 rounds
- Your table will have 5 minutes to record the measurements of the masses, volumes and lengths of the substances at your table.
- Your goal is to be both precise AND accurate
- Before your agent team can successfully complete your mission, you need to look at some lab equipment profiles... For each round:
- You'll have 5minutes to read and record all the measurements
- Create a table like this in your notes Ex: 4km = ____m Notes: The Metric System How do you use the "ladder method"?
1. Determine your starting point
2. Count the "jumps" to your ending point
3. Move the decimal the same number of jumps in the same direction Starting Point Ending Point How many jumps does it take?
4._._._ = 4000m 1. 1000mg = ____g
2. 14km = ____m
3. 1L = ____mL
4. 109g = ____kg
5. 160cm = ____mm
6. 250m = ____km Try These in your notes 7. 56cm ____ 6m
8. 7g ____698mg Convert Compare using <, > or =. - Qualitative/Quantitative Data
- Lab Expectation
- Procedures
- Lab Equipment (Name, Function)
- Units and Measurement
- Conversions
- Active Reading Quiz on Thursday: Have Inquiry Investigation #2 Pre-Lab on your desk. DO NOT TURN IT IN!!! Catalyst: Marielle did an experiment on how much kool-aide dissolves in water. After 4 trials, she got the data: 4.0mg, 4.1mg, 4.4mg and 4.2mg. The true value was 4.6. Was her data precise or accurate? Explain. Sept. 18 - Daily News Artifact (DNA): “One Day, Growing Spare Parts Inside the Body” - A surgeon is working on a different method of organ regeneration, so far only in animals — using another part of the body to nourish the replacement as it grows and is ready for transplanting. – Sept. 17, NY Times Quote of the Day: "Your life is your message to the world, make sure it's inspiring" - Unknown WRITE THE QUESTION AND ANSWER!!!
1. What are the units of mass?
2. What is the goal of the lab?
3. What 3 materials will you be provided with?
4. What is the equation for density?
5. If the density of an object is 12g/L and the mass of it is 48g, what is its volume? Lab Quiz Write the correct abbreviation for each metric unit.

1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____
2) Meter _____ 5) Millimeter _____ 8) Centimeter _____
3) Gram _____ 6) Liter _____ 9) Milligram _____
Try these conversions, using the ladder method.

10) 2000 mg = ___ g 15) 5 L = ___ mL 20) 16 cm = ___ mm
11) 104 km = ___ m 16) 198 g = ___ kg 21) 2500 m = ___ km
12) 480 cm = ___ m 17) 75 mL = ___ L 22) 65 g = ___ mg
13) 5.6 kg = ___ g 18) 50 cm = ___ m 23) 6.3 cm = ___ mm
14) 8 mm = ___ cm 19) 5.6 m = ___ cm 24) 120 mg = ___ g Homework: - Work in groups of 3 - Choose WISELY. I still have the power to switch people.
- Each member of the group should make their own solution in a beaker, and then mix all three to see if layers form.
- Hint: Higher density solutions will sink to the bottom.
-Record ALL trials and observations Lab Today IF you did not turn in your contract/HW/got less than an 80% on the quiz, please do the following:
- In the chemistry text book, define the terms: solution, mixture and density.
- Explain each step of the scientific method.
- When done, observe other groups - but DO NOT TALK TO THEM. Only write down what you see. Be as specific as possible. Catalyst (Do Now): Convert the following:
1. 4.5m = ____km
2. .03hg = ____mg
3. 5.5cL = ____L
4. 4.046kg = ____g Lab Expectations... 1. Always wear gloves, goggles and close-toed shoes.
2. Do not start the lab until told to do so by your teacher.
3. No fooling around/playing in the lab.
4. No eating/drinking/grooming/lip gloss in the lab.
5. Wear glasses instead of contacts if possible and tie back long hair.
6. Respect yourself, your peers, our materials and equipment.
7. Handle equipment carefully and deliberately. Do not snatch/throw anything.
8. Keep your work area clean before, during and after lab. - You are responsible for cleaning up your station!
9. The lab is not over until everything has been properly cleaned and put away.
10. If there is broken glass, a spill, an injury or accident, let your teacher know ASAP! pg. 3 - Answer pre-reading questions
pg. 4-9 - Read Section 1 and take notes
pg. 9 - Answer questions 2, 3, 5, 6, 7, and 10
Look up the definitions of:
- mass
- volume
- density
- solution
- mixture
- reaction
-physical change
WHEN DONE: STUDY FOR QUIZ TOMORROW!!!! Book Work: Catalyst (Do Now):
1. What are the units for mass?
2. Cayla has thirty meters of fabric for a set she is designing. How many kilometers, centimeters and millimeters does she have?
3. Is the observation" There are 4 grams of solid in the beaker" a qualitative OR quantitative observation? Catalyst (Do Now)
- So...should DHMO be banned? Why/why not?
- What is DHMO?
- Can we believe everything we read/hear? Catalyst: What types of things does the Science ACT test? What do you think makes it a challenging test? The ACT Science section is a SCIENCE REASONING TEST.
What does that mean?
They want to see HOW you THINK.

4 sections
English (45min) – 75ques
Math (60min) – 60ques
Reading (35min) – 40ques
Science (35min) – 40ques The Science ACT
3 Interpretation of Data (IOD) Passages
5 questions/ passage analyzing data
3 Scientific Investigation (SIN) Passages
6 questions/ passage examining an experiment
1 Evaluation of Models (EMI) Passage (AKA “Dueling Scientists)
7 questions/ passage comparing perspectives/hypotheses The Science Reasoning Test No calculator
35min, 40ques, 7passages (ONLY 5min/passage!!)
7 passages are broken up as follows: This is a “THINKING” test.

T or F? “I will do poorly on the ACT Science Section because I am bad at science.

T or F? There is a penalty for a wrong answer.

So...If you have a strategy – you can answer ANY QUESTION.
Thought process:
What is the question asking me?
Where do I need to go to answer the question?
What am I looking for (KEY TERMS, KEY DATA from the question)?
What is the answer? True or False
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