NAME_________________________________Block_____________
Lab Partner's Name: ______________________________
TITLE: DENSITY....PART
1 Date:__________________
INTRODUCTION:
Density is defined as the ratio of the mass to the volume occupied by a substance. Volumes of liquids are measured directly in a graduated cylinder by displacement. The initial volume of water is recorded. An object is placed in the water and then the final volume is recorded. The difference in the volume is equal to the volume of the object.
The volume of a regularly shaped object may be calculated by measuring the dimensions of the object and then using a formula for volume to calculate the volume.
The volume of a rectangular solid = length x width x height
The volume of a cylinder =
 r
2
x h
The volume of a sphere = 4/3
 r
3
The mass of an object is measured on a balance and is expressed in the units called grams. The important part of this lab is to correctly measure data and recording the data with the correct number of significant figures. From the data collected, the density of the object will be calculated. Review the rules for significant figures when doing calculations.
The equation for density is: DENSITY = Mass/Volume
Make sure you have units for all measurements. Make sure you record the data using the correct number of significant figures.
PURPOSE: To collect quantitative data using the correct number of significant figures and units. To practice calculations for density and to express the final answers in the correct number of significant figures.
EQUIPMENT : Balance, centimeter ruler, 100 mL graduated cylinder, Objects
A,B,C,D,E.
PROCEDURE:
1. Measure and record the dimensions of each of the metal objects A,B,C,and D.
Record the measurements on the data table on the back of this sheet. This includes length, width, height, diameter, etc... of each object if appropriate. Be sure to include the correct number of significant figures in the measurements and the correct units.
2. Measure the mass of each of the objects A,B,C, D, and E and record this on the data table.
3. Using the method of water displacement, place approximately 50 mL of water in a
100 mL graduated cylinder. Measure the volume of the water before placing an irregular object into the water. Record the measurement using the correct number of significant figures and correct units in the data table on the back side of this sheet.
4. Place object E into the water. Measure and record the final volume of water using the correct number of significant figures and correct units in the data table.

5. Calculate the density of each of the objects, be sure to use units when arriving at the final answer. Round off all calculations to the correct number of significant figures.
Your instructor will help you with this.
DATA TABLE:
Metal
Object
Object E: Irregular shape: Displacement method
Mass of object________________
Initial Volume of water in graduated cylinder:____________
Final Volume of water in grad cylinder after object placed in it:___________
CALCULATIONS :
1. Calculate the density of each object. Show all work on a separate sheet of paper .
Then transfer the calculated densities into the table below.
OBJECT DENSITY (express in correct significant figures and units)
A
B
C
D
E
2. Why is it important to indicate the temperature when expressing the density of an object? (Think about how temperature affects an object. What does it change?)
3. Which objects should sink in water? (A, B, C, D, E) Why? (Hint: What is the density of water?)
4. Now staple your calculation sheet to this lab sheet before turning in. Make sure you have your name, block, and date on all papers, even if they are stapled together.