Homework Due Tomorrow: 1. Density Lab Results Section (pages 7-9) 2. Density HW (for partial credit) 3. Classroom Materials (for partial credit) 4. Progress

Homework Due Tomorrow:

1. Density Lab Results Section (pages 7-9)2. Density HW (for partial credit)3. Classroom Materials (for partial credit)4. Progress Reports (for partial credit)

Oct. 9, 2012

AGENDA:1 – Bell Ringer2 – Density Lab3 – Density Lab

Results Section4 – Exit Ticket

Today’s Goal:Students will be able to calculate density of substances.Homework

1. Density Lab Results Section

(pages 7-9)

2. Density HW (for partial credit)

3. Classroom Materials (for partial credit)

4. Progress Reports (for partial credit)

CHAMPS for Bell Ringer

C – Conversation – No Talking H – Help – RAISE HAND for questionsA – Activity – Solve Bell Ringer on

binder paper. Homework out on desk

M – Materials and Movement – Pen/Pencil, Notebook or Paper

P – Participation – Be in assigned seats, work silently

S – Success – Get a stamp! I will collect!

Tuesday, Oct. 9th

Objective: Students will be able to calculate density of substances.

Bell Ringer:1. What is the equation for

density?2. How do you calculate the

volume of an object?

Have your:3. Density homework4. Classroom Materials5. Progress Reportout on your desk.

4 MINUTES REMAINING…

Tuesday, Oct. 9th







Tuesday, Oct. 9th







Tuesday, Oct. 9th






1minute Remaining…

Tuesday, Oct. 9th






30 Seconds Remaining…

Tuesday, Oct. 9th






BELL-RINGER TIME IS

UP!

Tuesday, Oct. 9th






Shout Outs

Period 1 – Leonard StewardPeriod 2 – Rashad BekkiPeriod 3 – Shakayla Johnson

Oct. 9, 2012

AGENDA:1 – Bell Ringer2 – Density Lab3 – Density Lab

Results Section4 – Exit Ticket

Today’s Goal:Students will be able to calculate density of substances.Homework

1. Density Lab Results Section

(pages 7-9)

2. Density HW (for partial credit)

3. Classroom Materials (for partial credit)

4. Progress Reports (for partial credit)

Week 4

Weekly AgendaMonday – DensityTuesday – Density LabWednesday – Phases of MatterThursday – Phase ChangesFriday – Quiz 3

CHAMPS for Lab

C – Conversation – Whisper to partner only.

H – Help – RAISE HAND for questionsA – Activity – Follow directions, take

notes.M – Materials and Movement –

Pen/Pencil, Packet, P – Participation – Complete pages 7-

9S – Success – Start when directed,

follow teacher’s directions

Introduction

Introduction: Density is a physical property of matter that is unique for every different substance. Chemists use density to identify the identity of different substances. Chemists also calculate the percent error in their measurements to help to determine the accuracy of their measurements. In this lab, you will be characterizing the density of two different objects. You will then examine the accuracy of your measurement skills by calculating the percent error.

Purpose: To determine the density of various objects and to calculate percent error.

Materials: Wood block, ruler, electronic balance, graduated cylinder, metal rod, water, calculator.

Equations Needed: Volume of Object = Final Volume of H2O – Initial Volume of H2O Density = mass (with object) (without object) Volume

Part 1

Procedure (Part 1):

1. Measure the length, width and height of the wooden block. Record in data Table 1. 2. Calculate the volume of the block using the equation V= L x W x H. The units of volume are

cm3=mL. Record in Table 1. 3. Using the electronic balance, determine the mass of the wooden block in grams. Measure to

the tenths place (0.1 grams). Record in Table 1. 4. Calculate the density of the block using the equation D = mass/volume (g/mL). Record in Table

1. 5. Calculate the percent error of the wood block vs. the actual density provided by the teacher.

Part 1

Object Length (cm) Width (cm) Height (cm) Volume (cm3= mL)V = L x W x H

Mass (g) Density = Mass Volume (Units = g/mL)

Wood Block

Table 1. Measurement and Calculations for Density of Wood Block

Wooden Block Densities

Wooden Blocks

Identifier Wood

Actual Density (g/mL)

A Balsa 0.13B Balsa 0.13C Oak 0.75D Lignum 0.18E Oak 0.75F Lignum 0.18G Hemlock 0.48H Hemlock 0.48I Pine 0.43J Pine 0.43K Poplar 0.63L Poplar 0.63M Maple 0.75N Maple 0.75

Part 1

Percent Error Calculation:

Error = Actual Value – Measured Value

Error = --- =

Percent Error of Wood Density = ________Error_______ x 100% Actual Density of Wood

Actual Density of Wood = (from teacher)

Measured Density of Wood = Error =

Part 1

Percent Error of Wood Density = ____________________________________ x 100% =

Absolute Value of Error = (number is always positive)

Actual Density of Wood = (from teacher)

Part 2

Procedure (Part 2):

1. Determine initial volume of water in the graduated cylinder. Record in Table 2. 2. Carefully place metal rod in graduated cylinder, measure new final volume. Record in Table 2. 3. Using the electronic balance, determine the mass of the metal rod in grams. Record in Table 2. 4. Calculate the density of the metal rod, using the equation D = mass/volume (g/mL). Record in

Table 2. 5. Calculate the percent error of the measured density of the metal rod vs. the actual density

provided by the teacher.

Part 2

Object Initial Volume (mL) of Water in Graduated Cylinder

Final Volume (mL) of Water + Object in Graduated Cylinder

Final – Initial Volume of water(Volume of metal rod)

Volume (mL) of metal rod

Mass (g) Density = Mass Volume (Units g/mL)

Metal Rod

Table 2. Measurement and Calculation for Density of Metal Rod

Part 2

Metal RodsColor Metal

Density (g/mL)

yellow copper 8.96

grey aluminum2.70

Part 2

Percent Error Calculation:

Error = Actual Value – Measured Value

Error = --- =

Percent Error of Metal Density = ________Error_______ x 100% Actual Density of Metal

Absolute Value of Error = (number is always positive)

Actual Density of Metal = (from teacher)

Measured Density of Metal = Error =

Part 2

Percent Error of Metal Density = ____________________________________ x 100% =

Actual Density of Metal = (from teacher)

Homework Due Tomorrow:

1. Density Lab Results Section (pages 7-9)2. Density HW (for partial credit)3. Classroom Materials (for partial credit)4. Progress Reports (for partial credit)

Documents

Homework Due Tomorrow: 1. Density Lab Results Section (pages 7-9) 2. Density HW (for partial credit) 3. Classroom Materials (for partial credit) 4. Progress