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