1. Measurement and Data Collection
Pre-AP Biology

2. Bellwork
You are making a 10% gelatin solution by adding 10 g of gelatin to 100 mL of water and heating to 70oC. What measurement tools would you use to make this solution?
Be ready to share
11/24/2018

3. Objectives Define the international system of units
Calculate conversions between metric units
Identify scientific tools in the laboratory used for measurement

4. Purpose
Your experimental results will not mean very much if you don’t have a way to attach numbers or non-opinion descriptions to them.
The numbers collected must be expressed in units that have the same meaning world-wide
Scientists have developed tools to assist in data collection
Proper organization of the data allows the scientist to determine what the data really means.
11/24/2018

5. International System of Units-Metric System
Scientists use the metric or SI systems of units for the measurement of physical quantities-length, volume, and mass
This system of measurement is used world-wide
The metric system is a decimal system of measurement that is scaled on multiples of 10
Prefixes are used in front of the units to indicate powers of ten

6. Metric System Measurement Base Unit Symbol Mass gram g Length meter m
Volume
liter L

7. Metric Prefixes Prefix Symbol Power tera- T 1012 deci- d 10-1 giga- G
109
centi- c
10-2
mega- M
106
milli- m
10-3
kilo- k
103
micro- 
10-6
hecto- h
102
nano- n
10-9
deca- da
101
pico- p
10-12

8. Metric Conversions
When converting between metric units, follow these rules
Always convert to base units first
Ex. To convert cmkm
must first convert cm to m then to km
Make conversions using the prefix definition
Ex. Use the conversion 1 cm = 102 m
rather than 1 m = 100 cm

9. Example
Conversion of 6.5 km to m
Start with what?

10. Why do I need to learn this method?
You need to fill your swimming pool with your garden hose. The hose releases 1L of water per minute. Your pool holds 1000 kLof water. How long will it take to fill your pool?
Can you answer this by moving the decimal point?

11. Example
Conversion of 6.5 km to mm

12. Practice Problem-complete on note-taker
435 mL  L

13. Practice Problem-complete on note-taker
5.39 g  mg

14. Measurement tools used in Biology

15. Reading a Meter Stick
Meter Stick – major scale division represent centimeters
Each cm is further divided into minor scale divisions-0.1 cm or 1 mm divisions

16. Reading volume in a graduated cylinder
Graduated cylinder is marked off in equal units of volumes
Usually they are graduated in mLs
Most graduated cylinders have
Major scale divisions – associated with numbers
Minor scale divisions between the numbers
Read the volume at the bottom of the meniscus

17. Use of balance for determining mass
In this class, an electronic balance will be used for measuring mass
Zero the balance by hitting the Tare button before each measurement
Place object on stainless steel tray
Read the value for mass
If you get the tray dirty, please clean it off

18. Closure Activity
Name two measurement tools discussed in the notes today and explain how they are used in measurement.

19. Measurement Lab

20. Constructing well organized Data Tables

21. Example of a Good Data Table-
Effect of fertilizer on plants
Date
Height in cm of plant
Appearance of leaves
4/5/11 10
Leaves are green and there are 2 areas of light green new leaves
4/6/11
All leaves are green and there are 3 areas of light green new growth
4/7/11 11
The plant has 3 areas with light green leaves. The leaves appear to be larger
4/8/11 13
Plant is more spread out and has 5 areas of light green leaves
4/9/11 16
Plant has 5 areas of light green leaves
11/24/2018

22. Think-Pair-Share
Examine the example data table. Write down key characteristics of a data table on your note-taker. Share with a partner
3. Think-pair-share
teacher presents a question
teacher gives wait time for student to form answer
teacher instructs students to share their answer with a partner
teacher calls on non-volunteers to share with the class 3

23. Data table characteristics
Title
Clear labels
Dates
Column/row labels
Units are included
Easy to view
Straight lines
All data can be displayed
11/24/2018

24. PROPERTY OF PIMA COUNTY JTED, 2010
Minute Paper- think back to the bellwork
You have one minute to write down qualitative and quantitative data in the form of a data table that you might take on the new species of plant
Be prepared to share.
29. Minute paper or Quick Write
teacher provides a prompt from the lesson
students have one minute to write down a summary of the key points
students compare with a partner
teacher uses a strategy to check all
PROPERTY OF PIMA COUNTY JTED, 2010 24