Oct. 1, 2012 AGENDA: 1 – Bell Ringer 2 – Cornell Notes: Chemical & Physical Properties; Density 3 – Demos 4 – Start Homework Today’s Goal: Students will.
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Oct. 1, 2012
AGENDA:1 – Bell Ringer2 – Cornell Notes:
Chemical & Physical Properties; Density
3 – Demos4 – Start Homework
Today’s Goal:Students will be able to calculate density of substances.Homework1. Turn in missing work
TODAY!2. Density Questions3. Come after school to
make up last Friday’s QUIZ 3 if you were absent that day (9/28/2012).
Monday, Oct. 1
Objective: Students will be able to calculate density of substances.
Bell Ringer:Why is a backpack full of gym
clothes lighter than the same backpack full of books?
4 MINUTES REMAINING…
Monday, Oct. 1
Objective: Students will be able to calculate density of substances.
Bell Ringer:Why is a backpack full of gym
clothes lighter than the same backpack full of books?
3 MINUTES REMAINING…
Monday, Oct. 1
Objective: Students will be able to calculate density of substances.
Bell Ringer:Why is a backpack full of gym
clothes lighter than the same backpack full of books?
2 MINUTES REMAINING…
Monday, Oct. 1
Objective: Students will be able to calculate density of substances.
Bell Ringer:Why is a backpack full of gym
clothes lighter than the same backpack full of books?
1minute Remaining…
Monday, Oct. 1
Objective: Students will be able to calculate density of substances.
Bell Ringer:Why is a backpack full of gym
clothes lighter than the same backpack full of books?
30 Seconds Remaining…
Monday, Oct. 1
Objective: Students will be able to calculate density of substances.
Bell Ringer:Why is a backpack full of gym
clothes lighter than the same backpack full of books?
BELL-RINGER TIME IS
UP!
Oct. 1, 2012
AGENDA:1 – Bell Ringer2 – Cornell Notes:
Chemical & Physical Properties; Density
3 – Demos4 – Start Homework
Today’s Goal:Students will be able to calculate density of substances.Homework1. Turn in missing work
TODAY!2. Density Questions3. Come after school to
make up last Friday’s QUIZ 3 if you were absent that day (9/28/2012).
Monday, Oct. 1
Objective: Students will be able to calculate density of substances.
Bell Ringer:Why is a backpack full of gym
clothes lighter than the same backpack full of books?
Week 4
Weekly Agenda
Monday 10/1 – Chemical & Physical Properties; Density
Tuesday 10/2 – (7th pd) PracticeWednesday 10/3 – (all pds)
Accuracy & PrecisionThursday 10/4 – Density LabFriday 9/28 – Review and QUIZ
4
CHAMPS
C – Conversation – No Talking – Take notes
H – Help – RAISE HAND for questionsA – Activity – Cornell Notes: Chemical
& Physical Properties; DensityM – Materials and Movement –
Pen/Pencil, Notebook or PaperP – Participation – Complete your
notesS – Success – Write three questions
and summary about notes. Answer HW questions.
Cornell Notes: Please take out your notebook and properly set up your
paper.Topic: Chemical &
Physical Properties; Density
Date: 10/1/2012
Physical and Chemical Properties
Physical properties: Characteristics that
can be measured or observed without changing the object’s composition
Chemical Properties: Ability of a
substance to change into one or more new substances (chemical reaction)Examples:
Density, Color, Melting, Boiling, (Phase Changes), Cutting, Folding,
Crushing
Examples:Chemical Reaction:1) Gas evolves (comes
off)
2) Color change3) Temperature
change
Density
Density is a physical property of matter that is unique for each substance. For example:
The density of gold is 19.32 g/mL. The density of pure water is 1.00 g/mL.
Density is defined as theamount of mass per unit volume
Density = _mass (g)_ or D = m volume (mL) V
Units = g/mL
Measuring Density (D = m/v) To find an object’s…
Mass (grams) Use a balance or scale Volume (mL)
If the object has a regular shape, you can simply measure the sides and use geometry to calculate volume.
If the object has an irregular shape, you can measure volume by the displacement of water in a graduated cylinder.
Vobject = Vwater with object – Vwater without
object
Practice: Which is more dense?
Grape Foam Block
Practice:Calculate the Density of…
1. …an object with a mass of 50g and a volume of 5mL.
2. …an object with a mass of 8g and a volume of 16mL.
3. …an object with a volume of 3mL and a mass of 12g.
4. Which of these objects will float in water? (water’s density = 1.00 g/mL)
Practice: Check your answersCalculate the Density of…
1. …an object with a mass of 50g and a volume of 5mL. D=50g/5mL=10g/mL
2. …an object with a mass of 8g and a volume of 16mL. D=8g/16mL=0.5g/mL
3. …an object with a volume of 3mL and a mass of 12g. D=12g/3mL=4g/mL
4. Which of these objects will float in water? (water’s density = 1.00 g/mL) Object #2 will float, 0.5g/mL < 1g/mL
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