Lab 4 : Density Inquiry

This column shows how chemicals form layers according to their densities. The lowest density is at the top.

This video will help you to get ready for the density lab.

Name : _______________________Period:_______ Date:__________

LAB 4 Density Inquiry : The Main Lab Activity

General Directions: You will work within your lab group, following the procedure. Each person will submit a hand-written lab report. Most work should be recorded in your lab notebook. One graph will be submitted in Google Classroom.

Record which kit you have been given: Kit # ________

A. Rectangular Blocks :

Density can be used to identify substances.

Do the following in Data Table A:

1. Calculate the volume of each rectangular block in cubic centimeters, cm3 V = L x W x H.

Show your measurements and calculations IN THE DATA TABLE ,with the proper units and the correct number of decimal places based on the measuring tool. Show the length , width and height as part of the work for the calculation. ( A, B, C ,D )

2. Measure the mass of each block and record it on the data table with proper units and correct decimal places.

3. Calculate the Density of each block. Density = Mass divide by volume. The number of decimal places in the record is important. Round the number based on the tools used. Record the lowest number of decimal places which the tool measured. ( Hint : The balance has the lowest.)

EACH PERSON should do at least two measurements and calculations. Measure a block and check the measurements of your partner. Make a table like this for four blocks in your lab notebook ( SHOW UNITS) :

Data Table A : Rectangular Blocks

Is it Copper? Silver? Aluminum?

Make a Table like this in your lab notebook :

Data Table A Part 3: Evidence and Identification

These are all metals. Choose from this list : Tin, Copper, Gold, Silver, Aluminum, Brass, Iron, Lead, Nickel, Zinc, Titanium, Uranium

B. Get a piece of foil. Trim it to be a large square if it is irregularly shaped. It needs to be larger , so that the mass is great enough to be measured. Measure the Length and Width...The height is 0.0015 cm ( Revised 2021) Get the mass of the piece and calculate the density.

Data Table B : Foil Density ( Make a data table based on this:)

Volume:

_______________

V=L x W x H

____________

What material is it?

_____________

Mass:

________________

What evidence is there for its identity?

Qualitative :________

Quantitative:_______

Density:

_____________

C. Each group has been given a cube. Figure out what makes it up. Prove it. Write out your claim, evidence and reasoning.

Write the number for your cube. _________ ( Each one is different.)

Data Table C : Cube Density and Identification

D. I.D. Challenge : Each person will be given a colored cylinder. Your mission is to identify the substance and provide proof of I.D. Record the color and measurements for your cylinder. Record ONLY YOUR WORK, the group data is not needed.

Table D : Identification of the Cylinder

Cylinder and cube ID Chart: information

E. The "Gold Star: Challenge : Receive a gold star on your lab report and special recognition if you complete this part correctly. ( Part E is optional.)

This can be attempted only after Mr. Ulmer has reviewed your completed Lab Report for A -D. Mr. Ulmer has a sample for you to analyze. IS IT GOLD?

1. You must first submit a written "Claim" and suggested method for collecting "Evidence".

2. If you method is approved, you will be allowed to test the sample.

3. You will be allowed to submit one report that documents your claim, evidence and reasoning for "IS IT GOLD?"

LAB 4 Density Inquiry : Rubric

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