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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Presentation transcript:

Oct. 1, 2012 AGENDA: 1 – Bell Ringer 2 – Cornell Notes: Chemical & Physical Properties; Density 3 – Demos 4 – Start Homework Today’s Goal: Students will be able to calculate density of substances. Homework 1. Turn in missing work TODAY! 2. Density Questions 3. 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 Ringer 2 – Cornell Notes: Chemical & Physical Properties; Density 3 – Demos 4 – Start Homework Today’s Goal: Students will be able to calculate density of substances. Homework 1. Turn in missing work TODAY! 2. Density Questions 3. 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 – (7 th pd) Practice Wednesday 10/3 – (all pds) Accuracy & Precision Thursday 10/4 – Density Lab Friday 9/28 – Review and QUIZ 4

CHAMPS C – Conversation – No Talking – Take notes H – Help – RAISE HAND for questions A – Activity – Cornell Notes: Chemical & Physical Properties; Density M – Materials and Movement – Pen/Pencil, Notebook or Paper P – Participation – Complete your notes S – 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 change 3)Temperature change

Density  Density is a physical property of matter that is unique for each substance.  For example: The density of gold is g/mL. The density of pure water is 1.00 g/mL.  Density is defined as the amount 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. V object = V water with object – V water 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 answers Calculate 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