Density Overview

Hours: 1st and 2nd

START HERE

Density “To Do List” – may not complete all of this today Complete the Bell Ringer Create procedure for lab Create table for lab Collect data Create graph Finish follow-up questions

Important Reminders – 1st and 2nd Hour

Mystery Chemicals Chart and Analysis should have been turned in

Online Blog Posting – Due Wednesday

Upcoming Vocabulary Quiz – Wednesday

Week of September 23rd

Bell Ringer: 9.23.13 Using the following measurements, calculate the

density of the object.

Object Mass

Unit: g

Initial Volume

Unit: mL

Final Volume

Unit: mL

Actual VolumeFinal - Initial

Unit: mL

Density (Mass÷Volume)

Unit: g/ml

Gold Necklace

38.6 45.3 47.3 ??? ???

Bell Ringer: Solution

First, find the volume of the the gold necklace What do you need to do?

Final Volume – Initial Volume = Actual Volume

47.3 – 45.3 = 2 ml

Second, find the density What information do you need?

Mass and Volume Density = Mass / Volume

Density = 38.6 grams / 2 ml = 19.3 g / ml

Learning Targets

What are we learning? I can determine the density of an object.

How will we know we were successful? I created a procedure and developed a chart to

organize my data for the density lab (Day 1). I completed the analyzing and concluding questions

for the density lab (Day 2).

Density Review

Ratio between mass and volume

How much stuff is in a given space

How do you find density?

http://www.youtube.com/watch?v=VfMDC4guXZg

Density Lab Intro

How to… Reading a Graduated Cylinder

Read the bottom of the curve Record out one decimal

Example: 44.4 ml

Triple Beam Balance Review Check unit – grams Make sure the scale reads – 0 g

Density Lab

Prediction: Predict what would happen when you determine the density of

the objects you have. For example, If you think the density will be different. If you think it will be the same, explain why? Examples:

The density of the 3 objects are going to be different because… The density of the 3 objects are going to be the same because…

Density Lab Supplies: Graduated Cylinder, 3 metal objects, Beaker, and

Triple beam balance

Procedure:

1. Write directions for finding Volume of an object.

2. Create chart to organize data

3. Get directions and chart initialed by me

4. Find Volume of each object ( record in chart)

5. Find Mass of each object (record in chart)

6. Calculate Density

Procedure

How would you find the volume of the 3 objects?

1. Using the graduate cylinder, add water

2. Measure INITIAL volume and record

3. Add object carefully

4. Re-measure the volume and record

5. Calculate the volume of the object by:Final Volume – Initial Volume = Actual Volume of Object

Density Chart

Object Mass

Unit: g

Initial Volume

Unit: mL

Final Volume

Unit: mL

Actual VolumeFinal - Initial

Unit: mL

Density (Mass÷Volume)

Unit: g/ml

Wire(small)

Tube(medium)

18 Pennies(Large)

Hours: 3rd, 5th,and 6th

START HERE

Today’s Tasks Complete the Bell Ringer Finish any measurements

Check with each class to see where they are at Create graph Finish follow-up questions

Important Reminders – 3rd, 5th and 6th

Recently Graded: Mystery Chemicals Chart and Analysis should have

been turned in Bell Ringers – Week of September 9th

Upcoming Vocabulary Quiz – Wednesday

Bell Ringer: 9.23.13

Using the following measurements, calculate the density of the object.

Object Mass

Unit: g

Initial Volume

Unit: mL

Final Volume

Unit: mL

Actual VolumeFinal - Initial

Unit: mL

Density (Mass÷Volume)

Unit: g/ml Gold Necklace

38.6 45.3 47.3 ??? ???

Bell Ringer: Solution

First, find the volume of the the gold necklace What do you need to do?

Final Volume – Initial Volume = Actual Volume

47.3 – 45.3 = 2 mL

Second, find the density What information do you need?

Mass and Volume Density = Mass / Volume

Density = 38.6 grams / 2 ml = 19.3 g / ml

Learning Targets

What are we learning? I can determine the density of an object.

How will we know we were successful? I created a procedure and developed a chart to

organize my data for the density lab (Day 1). I completed the analyzing and concluding questions

for the density lab (Day 2).

Analyzing the DATA…

Looking at the measurements, what were the 3 main variables of the three different size objects? Mass Volume Density

Your goal is to create a graph showing how these changed. You will have 3 different colored lines.

Analyzing the Data

Using Notability, open your lab notes so far.

Click the “Wrench” button on the upper right hand corner to change the type of paper.

Choose the graphing paper (smallest option) – First one reading left to right

Analyzing your DATA: Setting up the graph

Objects

Mas

s, V

olum

e, o

r Den

sity

(

g)

(mL)

(g

/ml)

Small Medium Large(Wire) (Tube) (Pennies)

Key:MassVolumeDensity

60

40

20

Follow-Up Questions

Download the questions by going to my teacher webpage Go to “Spring Lake Park” webpage

Search the site… Type in: Streitz Go to the “Guest Materials” Page

Click on the appropriate document 3rd, 5th and 6th

Density Handout - General 1st and 2nd

Density Handout - Honors

Done Early…

Practice calculating density with minerals Go to: http://bit.ly/16kKXaB Choose different minerals to test

Record mineral number Include your measurements to figure out the density