Lesson 2 Determining Density Lesson 2 Introduction and Objectives, page 14. Lesson 2 Getting Started #1-2, page 15. Read and take notes on Useful Calculations, page 16 Inquiry 2.1, pages 16-17 (Student Sheet 2.1)

Volume Units: milliliter (mL), Volume – The amount of space matter occupies. Volume Units: milliliter (mL), cubic centimeter (cm3) 1 mL = 1 cm3 Volume of a block: V = l x h x w

Mass – The amount of matter in an object. Measure mass with a balance. Mass Unit: gram (g) Measure mass with a balance.

Density Units for density: Density = mass divided by volume or Density = m/v Units for density: g/cm3 or g/mL

How do you calculate the density of water? Brainstorm the steps with your partner. Write a rough draft of the steps in your notebook. Show your procedure to your teacher. Revise it if necessary. Write your procedure steps on Student Sheet 2.1. Collect your materials and carry out the investigation.

Method for finding the mass of 1 mL of water from 25 mL & 50 mL Mass of 25 mL water & GC – Mass of GC = Mass of 25 mL of water Mass of 25 mL water divided by 25 mL = Mass of 1 mL water (density) Mass of 50 mL water & GC – Mass of GC = Mass of 50 mL of water Mass of 50 mL water divided by 50 mL = Mass of 1 mL water (density)

Lesson 2 Determining Density Inquiry 2.2: Comparing the Densities of Different Substances Complete Student Sheet 2.2.

Mass of 1 cm3 (density in g/ cm3) (m/v) Lesson 2 Determining Density Table 1 Comparing Different Objects Substance Length (l) (cm) Width (w) (cm) Height (h) (cm) Volume (v) (cm3) (v = l x w x h) Mass (m) (g) Mass of 1 cm3 (density in g/ cm3) (m/v) White Plastic Block Clear Plastic Block Aluminum Block Wax Block

Lesson 2 Determining Density Create a page heading for: Inquiry 2.3 – Measuring the Densities of Irregular Objects. Use this notebook page to plan a “Story-Board” procedure for Inquiry 2.3: Use pictures and phrases to describe your steps. Use the same notebook page to plan a data table for Inquiry 2.3. Check your procedure and data table with Mr. Brown before you conduct the investigation. Complete Student Sheet 2.3.

Mass of 1 cm3 (density in g/ cm3) (m/v) Student Sheet 2.2 Data Table Rubric (5 points per row, 20 points for the table) Volume and mass are accurate, Density calculation is within .05 of answer. (5) Volume and mass are accurate, Density calculation is slightly inaccurate. (4) Volume or mass is not accurate, Density calculation is within .05 of answer. (3) Volume or mass is not accurate, Density calculation is inaccurate. (2) Data is mostly inaccurate or incomplete. (1) Substance Length (l) (cm) Width (w) (cm) Height (h) (cm) Volume (v) (cm3) (v = l x w x h) Mass (m) (g) Mass of 1 cm3 (density in g/ cm3) (m/v) White Plastic Block 5 2 50 47.8 .965 Clear Plastic Block 20 23.5 1.18 Aluminum Block 4 1 8 22.5 2.81 Wax Block 4.5* 2* 40.5* 36.2* .89*

- VObject Lesson 2 Determining Density = Inquiry 2.3: Create a procedure and a data table for Inquiry 2.3. Have your teacher approve your procedures and data table. Transfer the procedures and data table from your notebook to Student Sheet 2.3. Conduct the investigation. Clean up , return equipment.

- V Student Sheet 2.3 = Procedure Rubric 2. Put enough water in G.C. to cover object. Measure water level. 3. Place object in G.C. Measure new water level. 1. Use a balance to measure mass. 4. Subtract the difference. 5. Solve for density. Procedure Rubric All steps in order w/ pictures & words (10) All steps in order w/o pictures or words (7) Steps not in order w/ pictures & words (5) Steps not in order w/o pictures or words (3) D = Mass/Volume - = V 6. Repeat steps 1-5 for the other two objects.

Student Sheet 2.3 Data Table Rubric Density calculations are accurate, Table shows all data, has proper rows and columns that are neatly drawn with appropriate headings and labels. (10) Density calculations are accurate, Table shows all data, has proper rows and columns that are not neatly drawn with appropriate headings and labels. (8) Density calculations are not accurate, Table shows all data, has proper rows and columns that are neatly drawn but does not have headings and labels . (7) Density calculations are not accurate, Table shows all data, has proper rows and columns that are not neatly drawn and does not have headings and labels . (5) Table is mostly incomplete. (3) Object Mass (g) Volume (mL) Density (g/mL) Lag Screw 55.6 7 7.942 Copper Cylinder 55.5 6 9.233 Nylon Spacer 6.5 1.083 Answers are accurate if they are + or - .05 g/mL of values shown on this table.

Lesson 2 Determining Density Answer the “Reflecting On What You’ve Done” questions, #1a-f, on page 20 in your notebook. Lesson 2 Vocabulary. Read “Density as a Characteristic Property”, page 20. Read Mass or Weight?, page 21. Complete the worksheet: Mass or Weight?

Glossary Lesson 2: Characteristic Property: An attribute that can be used to identify a substance. A characteristic property is not affected by the amount or shape of a substance. Cubic centimeter (cm3): A unit used to measure volume, equal to 1 mL. Density: The mass of a known volume of a substance. Density is measured in g/mL or g/cm3. Displacement: To change the position of a substance by placing a more dense substance in it. Gram (g): A unit used to measure mass. Mass: The amount of matter in an object. Milliliter (mL): A unit used to measure volume, equal to 1 cm3. Volume: A measure of the space taken up by some matter Weight: A measure of the force of gravity.

Lesson 2 Determining Density Read: Archimedes’ Crowning Moment, page 22-23. Complete the worksheet.

Lesson 2 Determining Density Papers to paste in your notebook: Lesson 1: What is Matter? worksheet Lesson 2: Student Sheet 2.1 Student Sheet 2.2 Student Sheet 2.3

1 2 Lesson 2 Determining Density Which is more dense? Open Notebook Quiz: Lessons 1&2. Correct the quiz.

Lesson 2 Determining Density Performance Assessment: Student Sheet 2.4 – The Density of a Cork