Discovering Density



Honors Chemistry Chapter 3 Discovering Density Lab

Objective: To have students discover ways to calculate the density of various objects.

In this lab, you will be trying to find ways to measure the density of certain objects using some/all of the laboratory equipment provided. Groups must think of a procedure for each object and get teacher approval before beginning the experiment. Students must record all data in the proper format and show all calculations.

Requirements: Each student will hand in a lab report on a separate piece of paper containing:

At the top of the lab report should be:

Title

Purpose

Then there should be the following sections represented for each individual item.

Materials used – list only the materials needed for that trial.

Procedure (a separate procedure for each item – they may be different – also you may have to write 2 procedures for finding the density of an object if there are two ways of effectively and accurately finding the density). Please note – if a procedure for measuring is identical for a second or third substance you may write “Refer to the procedure for the __________,” instead of writing out the entire procedure.

Data tables – create a data table specific for that trial – make sure to measure correctly with proper estimation and significant figures.

Calculations – show your work and include units and proper significant figures.

For example – when you find the density of object x, you will have to write a materials section, then a procedure, followed by a data table and calculations. If there are two ways of finding density, then you will have to do another materials section, procedure, etc. Then you will have to repeat that process for the rest of the objects you will be testing. See the back of this page for a sample lab report

Caution! You will be using metal and glass in this lab. You must be careful when inserting any metal into a graduated cylinder. Please tilt the cylinder to the side and gently slide the pieces of metal until they delicately glide to the bottom.

Sample Lab report

Name

Title - ………

Purpose - ……….

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Object # 1 – Rubber ball – density trial 1

Materials # 1 - …….

Procedure # 1 - ………

Data Table 1 –

| | | | |

| | | | |

Calculations 1 - ………

Object # 1 – Rubber ball – density trial 2

Materials # 2 - …….

Procedure # 2 - ………

Data Table 2 –

| | | |

| | | |

Calculations 2 - ………

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Object # 2 – steel cylinder

Materials –

Procedure –

Etc.

Discovering Density Lab:

You are given 7 items: You must find the density of 4 of these objects. You may also do extra credit and do 1 additional object.

You may use any of the items on the density bar to find the density of the objects. You really don’t need anything more than what is in your density sample cup and what’s on the cart. You may also look around the lab and ask for other items to use if that is what you wish.

Please note: If you need more sample, ask for it.

Please note: If you don’t know what something is called, ask.

Please note: If you don’t know how to use a piece of equipment, ask.

Density Bar:

metal file lead fishing weights

string scoopula

balance hot plate

scissors pipette slide rule stop watch

water tweezers

thermometer stirring rod

aluminum block beakers (multiple sizes)

graduated cylinders (multiple sizes)

handbook of chemistry and physics

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