1. Warm Up
Direction: Copy down the questions and provide answers.
What kind of change is mixing soil with water to create mud? Explain why.
Explain why making coffee is not
a chemical change
Can you fit more atoms of water or lead in this box ? Explain why.
Agenda
Turn in Lab Mass
Quiz Lab Safety
Notes Unit 1-3
Lab volume
Homework
Sign syllabus by 4PM today
Aug 18 - Extra credit online due before 10PM

2. Safety Quiz Do not write on the QUIZ
Bubble in your ID # , version # and write your name on the scantron
Write your answers on the back for (#15-19)

3. Unit 1-3 Describing Matter

4. Unit 1-3 Describing Matter
Pick an object in the room, write a couple of words to describe it and we will try to guess the object you picked.
Describe using physical properties:
Mass, Volume, Color, Texture etc..

5. Unit 1-3 Describing Matter
Mass: The amount of matter contained in that object.
Mass is not weight!
Weight is the force produced by gravity acting on a mass. This can be different in different places.

6. Describing Matter Volume: the amount of space something takes up
solids = the height x length x width of the object
liquids = use graduated cylinder
Meniscus

7. Units of Measurement
Quantity: Something that has magnitude, size, or amount
Unit: a quantity adopted as a standard of measurement
-For meaningful descriptions, all quantities must be labeled with units.

8. Units of Measurement
-Since 1960 scientists world-wide have used the SI system of measurement. -SI = Système international d'unités
Quantity
Unit
Abbreviation
Distance or Length
Meter m
Mass
gram g
Temperature
Kelvin K
Amount of Substance
Mole
mol
usa, liberia, myanmar (has a weird system) are the only countries that doesn’t use the metric system SI = Interternational system of units

9. Conversion Factors
A conversion factor is a ratio that is derived from the equality of two different units and can be used to convert from one unit to the other
Example: 1 kg = 1000 g

10. Conversion Factors Other Frequently Used Units Volume 1 cm3 = 1 mL
Length
2.54 cm = 1 inch
Mass
kg = 1 pound

11. Converting SI Units Smaller unit Bigger unit
King Henry Died By drinking chocolate milk (mnemonic for remembering the prefixes)
Bigger unit

12. Example 1 Express 4 km in meters Given: 4 km Find: meters (m)
Plan (conversion factor): 1 km = 1000 m
Solve:
4 km x
1000 m
= 4000 m
1 km

13. Example 2 Express 100 centigram in kilograms Given: 100 cg
Find: centigrams (cg)
Plan (conversion factor): 100 cg = 1 kg
Solve:
1 g x
100 cg
= 100 cg
1 g

14. Example 3 Convert 12 kilometers to millimeter 4 km in meters
100 centigram in kilograms
Students solve, call on 3 for answers.

15. Individual Practice
Use the stair-step as a tool to guide you through the Unit 1-2 Conversion Factors Worksheet

16. Volume Lab
Part 1: Measure out drops of water into the 10 ml graduated cylinder and record the volume Part 3: -Measure 3ml of colored water from the tube to the 10ml-graduated cylinder -Drop bleach into your color graduated cylinder until it is cleared & record the # of drops
# Drops
Volume (ml)
drops/ml
ml/drop 50
100
150
Yellow =
Red =
Blue =
Green =

17. Clean up Procedure Return the unused bleach
Rinse everything out in the sink
Put the equipment in the front
Clean your lab table

18. Assignments
Summary at least 3 sentences and answer why is it important to include units in your measurement?
Finish lab due next class