Introduction:
Density is the concentration of molecules within an object on relation to its size. The formula for measuring density is mass/volume. In the experiment preformed for this lab report, calculating the density of a regular object (a wooden block) and two other irregular objects (zinc and tin) were found by a process known as water displacement. The purpose of this experiment was to prove that the density of an object remains the same no matter how much of it you have.

Materials:
1.
2. A wooden block
3. A graduated cylinder
4. Sink with running water
5. Ruler
6. A sample of zinc
7. A sample of tin
8. Electronic balance
9. Pencil/ pen and tables to record the data

Methods:
A. Finding the density of a regular solid
1. Measure the length, width and height of the wooden block, record the data in your table 2. Multiply the length, width, and height to find the volume of the block, record in your table. 3. Use the electronic balance to find the mass of the block. 4. Find the density of the block by dividing the mass by the volume. 5. In this experiment, the density was measured by g/cm3. B. Finding the density of a liquid

1. Measure the mass of the graduated cylinder on the electronic balance and write the number down. Remove the cylinder from the balance. 2. Fill the cylinder with 20mL of water and record this number in your data table. 3. Place the cylinder with the water in the electronic balance, this number will be the mass of the cylinder and the water, however, only the mass of the water is needed so you must subtract the mass of the cylinder from the first step. 4. Divide the mass by the volume of the water so you are left with the density of the water. Record this number in your data table rounded to the nearest whole number. 5. Repeat steps 2-4 with 40mL and then 60mL of water.

...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)...

...
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...

...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...

...
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...

...Ashley Robins
9/13/11
Honors Chemistry
Period 4
DensityLab
Purpose:
1. To determine the density of a solid using different laboratory techniques for measuring volume.
2. To use the intensive property of density to identify an unknown substance.
Procedure:
1. Obtain a bag marked with a number containing a cube and a cylinder from the teacher. Record the number on the bag in the data table....

...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
!
!...

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