Introduction:
The purpose of this lab will be to investigate the concepts of accuracy and precision for quantitative measurements using density as an example. The density of a sample will be found experimentally and compared to a known value. The relationship of averages and different analysis techniques to percent error will also be explored. Density is a characteristic of a substance which can qualitatively be described as the amount of matter (mass) squeezed into a given space (volume). The density of substance remains the same no matter the size of the sample at a given temperature. Quantitatively, density can be expressed as the mass of a substance per unit volume, and the volume of a cylinder can be expressed as π times the radius squared times the height. (Density=Mass/VolumeV = π(Diameter/2)^2 x Height)*

*Microsoft Word Starter 2010 does not allow creation of equations. This was the best alternative Materials:
Density sample cylinders; metric ruler; Electronic balance
Procedure:
Measure the mass, height, and diameter of five different cylinders from the substance as precisely as possible to ensure the correct measurements are recorded. Data Table:
Cylinder #| Mass (grams)| Height (centimeters)| Diameter (centimeters)| 2| 12.82g| 4.60cm| 1.55cm|
4| 16.51g| 5.60cm| 1.10cm|
8| 21.37g| 7.60cm| 1.60cm|
10| 24.09g| 8.60cm| 1.10cm|
14| 29.80g| 10.70cm| 1.10cm|

Analysis:
Graph -
Mass and Volume of Blue Cylindrical Objects
Mass and Volume of Blue Cylindrical Objects

Mass (g)
Mass (g)
Volume (cm^2)
Volume (cm^2)
`

Average Density Data Table -
Average Density (g/cm^3)| Team Average Density (g/cm^3)|
2.495 g/cm^3| 1.647 g/cm^3|

...
DENISTY LAB
2/25/13
Chemistry H.
Mrs. Halme
Objective: Your task is to determine the density of 3 known metals: Zinc, Copper, and Lead. They are each marked. You must then calculate the density of an unknown metal and determine its identity based on your data from your known samples.
Reagents: None
Equipment:
Lead
Copper
Zinc
Triple Beam Balance
Graduated cylinder
Unknown metal (Magnesium)
Beaker...

...
The Density Challenge: A Complete Inquiry Activity
Introduction
Density has been an important part of science for a very long time. Density was discovered by Archimedes, a Greek mathematician, around 250 BC while determining whether a craftsman had replaced some of the gold in the King of Syracuse’s crown with silver. Density is the compactness of a substance. The new concept of density...

...Regents Chemistry
Quarter 1 Midterm Review
1. The percent by mass of oxygen in Na2SO4
(formula mass = 142) is closest to
1) 11%
3) 45%
2) 22%
4) 64%
2. Given the unbalanced equation:
__Al(s) + __O2(g) → __Al2O3(s)
3.
4.
5.
6.
7.
balance the equation using smallest whole
number coefficients.
The percent by mass of aluminum in Al2O3 is
approximately
1) 18.9
3) 47.1
2) 35.4
4) 52.9
What is the approximate percent composition by
mass of CaBr2...

...!
Name: Laura Romero
!
5.04H: Gas Stoichiometry Lab Worksheet
Data and Observations:
Present all relevant data in a data table below. Include an observations section for any
observations that you made during the lab. (5 points)
Data Table
Mass of magnesium strip (grams)
0.032 g
Volume of gas collected (mL)
30mL
Barometric pressure (atm)
1.1 atm
Room Temperature (°C)
22 °C
Vapor pressure of the water (torr)
19.8 torr
!
!...

...Part I: Density of Unknown Liquid
Trial 1
Trial 2
Trial 3
Mass of Empty 10 mL graduated cylinder (grams)
25.55
25.56
25.55
Volume of liquid (milliliters)
8.8
8.65
8.5
Mass of graduated cylinder and liquid (grams)
30.65
30.62
30.565
Part II: Density of Irregular-Shaped Solid
Mass of solid
(grams)
39.537
38.515
40.975
Volume of water (milliliters)
50.01
49.9
52.4
Volume of water and solid (milliliters)
54.9
54
57...

...2014
Period 4
Lab #1: Density Determinations for Solutions
Theory:
The density of a sample of matter is very useful when trying to find the identity of an unknown substance. The units of density are quoted in (g/mL) for liquid samples of matter. For that reason if the volume is known of a liquid, determining its density is easily determined by weighing it accurately.
Density can also be used as a tool...

...Ciara Clark and Caroline Bedenbaugh 4A
DensityLab
Objective
: The purpose of this lab is to observe and explore the relationship of a substance’s
volume vs. its mass, and to calculate an object's density by using the relationship of its mass
and volume.
Data Tables
:
Data: Density of Water
Run
Mass of graduated
cylinder
volume of water added
mass of water
1
25.28 g
0.00 mL
0.00 g
2
26.15 g
1.00 mL
0.87 g
3...