Warm Up
8-21-15
Direction: Copy down the questions and provide
answers.
1. What kind of change is mixing soil with water to
create mud? Explain why.
2. What kind of change is baking
bread? Explain why.
3. Can you fit more atoms of water or iron in this
box ? Explain why.
Agenda
Quiz Lab Safety
Notes Unit 1-2
Lab Food dye and volume
Homework
Extra credit online due before
9PM tonight
Safety Quiz
• Do not write on the QUIZ
• Bubble in your ID # and write your name on
the scantron
• Bubble in the version #
White = version 1
Pink = version 2
• Write in complete sentences for the free
response (#13-17)
Unit 1-2
Describing Matter
• Volume: the amount of space something takes
up
-solids = the height length width of the object
-liquids = use graduated cylinder
Meniscus
Describing Matter
• Mass: The amount of matter contained in that
object. Mass can be measured using a balance
(for most objects)
– Mass is not weight!
– Weight is the force produced by gravity acting on
a mass. This can be different in different places.
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.
Units of Measurement
-Since 1960 scientists world-wide have used the SI
system of measurement.
-SI = Système international d'unités
Quantity
Distance or
Length
Mass
Temperature
Amount of
Substance
Unit
Abbreviation
Meter
m
gram
Kelvin
Mole
g
K
mol
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
Conversion Factors
Other Frequently Used Units
– Length
• 2.54 cm = 1 inch
– Mass
• 0.4536 kg = 1 pound
– Volume
• 1 cm3 = 1 mL
Converting SI Units
Example 1
• Express 4 km in meters
– Given: 4 km
– Find: meters (m)
– Plan (conversion factor): 1 km = 1000 m
– Solve:
1000 m
4 km x
= 4000 m
1 km
Example 2
• Express 100 centigram in kilograms
– Given: 100 cg
– Find: centigrams (cg)
– Plan (conversion factor): 100 cg = 1 kg
– Solve:
100 cg
1gx
= 100 cg
1g
Example 3
• Convert 12 kilometers to millimeter
Individual Practice
• Use the stair-step as a tool to guide you
through the Unit 1-2 Conversion Factors
Worksheet
Volume Lab
Part 1: Measure out drops of water into the 10 ml
graduated cylinder and record the volume
# Drops
Volume (ml)
drops/ml
ml/drop
50
100
150
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
Yellow =
Blue =
Red =
Green =
Clean up Procedure
• Rinse everything out in the sink
• Put the equipment in the front
• Clean your lab table
Homework
• Finish the Lab handout