Your Name: ______________________________________________________________

1 Purpose of this Lab

What is the goal of this lab? What question are you trying to answer, or what problem are you trying to explain? | | | | | | |To seperate a Neurotoxin and a Food Preservative under the same name, using calculations to figure out which is which. | | | | |

2 Hypothesis

After reading the lab instructions - but before starting the lab - record your best “educated guess” about what will happen in the experiment. Explain what lead you to this hypothesis. | | | | | | | | |I hypothesize that using precise calculations, I will figure out which is which. | |...

...FE 106
GENERAL CHEMISTRY
EXPERIMENT-1
DENSITY OF LIQUIDS
PREPARED BY BURAK COBAN
PURPOSE:
In this experiment we will learn how can we find the density of liquids and liquids of density how change effect of temperature, pressure, mass, volume and concentration. For this reason we will take NaCI solutions with different concentrations and we will measure theirdensities, so we will find out the effects of concentration on density of solutions.
THEORY:
Density is a physical property obtained by dividing the mass of a material or object by its volume (i.e., mass per unit volume).
Here is an old riddle:” What weighs more, a ton of bricks or a ton of feathers?” if you answer that they weigh the same, you demonstrate a clear understanding of the meaning of mass- a measure of quantity of matter. Anyone who answers that the bricks weigh more than the feathers has confused the concepts of mass and density. Matter in a bricks is more concentrated than in a feather – that is, the matter in brick is confined to a smaller volume. Bricks are denser than feathers. Density is the ratio of mass to volume.
Density= Mass (m) / Volume (V)
|Density of matter | d | g/ml |
|Mass of...

... Date
Lab: Denisty – Solids and Liquids
Part 1: Density
Background Information: The density of an object is how much “stuff”, or molecules, a
substance is made of. Density is how tightly packed the molecules are. To calculate the density
of a substance we need to know the mass (weight) of the substance and the volume (how much
space) of the substance. Mass is determined by weighing an object. Volume of regular shaped
objects is calculated by measuring length (L), width (W), and height (H) in centimeters (cm) and
then multiplying them. V = L x W x H. Density is calculated by dividing mass (in grams) by the
volume (in milliliters or cm
3
). D = M/V.
Part 2: Density of a regular shaped solid
Procedure: Use the materials at your station to complete the data table.
1. Measure the length of the object and record. Length = .
2. Measure the width of the object and record. Width = .
3. Measure the height of the object and record. Height = .
4. Calculate volume: V = L x W x H Volume = .
5. Use the scale to determine the mass of your object. Mass = .
6. Calculate the density of the object: D = M / V Density = .
Part 3: Density of a liquid
Procedure: Use the materials at your station to complete the...

...Introduction
In the densitylab unknown metals were weighed using beakers filled with water and an electronic scale. First the metal objects were weighed using an electronic scale. Then using water, the beakers were filled half way. Next, the metal objects were poured in. Then the amount of how much the water rose after the metal was put in is checked. Lastly, record the data and clean the objects used and put away.
Design
Research question: If mass and volume are correctly measured can the density of an unknown metal be calculated.
Variables:
Controlled: Water, Electronic Scale, Graduated Cylinder
Dependent: Density; Mass and Volume
Independent: Metal(s)
Method
Apron, Goggles, Electronic Balance, Beaker, Graduated Cylinder, water, unknown metal samples
Labeled Diagram
Uncertainties: Electronic Balance ± 0.01g
Hexagon ± 0.0mL Graduated Cylinder ± 1.0 mL
The independent variable is measured based off the how much the water rises.
The dependent variable is measured when the Initial Volume is subtracted from the final volume, which gives the density of the metal sample.
Controlling the Controlled Variables: The water and electronic scale were controlled. These materials were controlled because the amount of water put into the graduated cylinder could differ, and if the scale is not zeroed again after putting down the paper towel the mass could be...

...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.
Density of a cube:
Using a balance, record the mass of the cube to the nearest tenth of a gram. Then measure the length, width and height of the cube to the nearest hundredth of a cm. Last, calculate the volume of a cube using the formula L x W x H.
Density of a cylinder by water displacement:
Using a balance, record the mass of the cylinder to the nearest tenth of a gram. Then fill a graduated cylinder of water about half full. Record the volume to the nearest tenth of a mL. After that you carefully drop the cylinder in the graduated cylinder and record the new volume of water to the nearest tenth of a mL. The last thing you do is subtract the volume of the water you had at the beginning from the volume of water you had after adding the cylinder. This number is the volume of your cylinder.
Data:
Cube Cylinder
Mass of cube:10.4g Mass of cylinder: 29.1g
Length of cube:2.50cm...

...DENSITY OF LIQUIDS AND SOLIDS
by
Lab instructor:
Due date:
Results and discussion:
The purpose of the experiment was to determine the densities of the unknown liquid and solid as precisely and accurately as possible in order to identify them.
It was carried out first on distilled water in order to rule out systematic errors.
A 10 mL beaker was placed on a top pan balance and “tared”. The beaker was then removed and 10 mL of distilled water was pipetted into it before it was placed on the balance again. Thus, the mass of the water was obtained.
Five experimental trials were performed. The data and calculated results were tabulated (Table 1).
Table 1: Mass and Volume of Water and Density Calculations
Trial # Mass of water (g) Volume of water (mL) Density of water (g/ mL )
1 9.95 10.00 0.995
2 9.98 10.00 0.998
3 9.95 10.00 0.995
4 9.95 10.00 0.995
5 9.93 10.00 0.993
The densities were calculated using the relationship
Density (g/ mL) = (Mass (g))/(Volume (mL))
An example of such a calculation using the trial #1 data:
Density (g/ mL) = (9.95 (g))/( 10.00 (mL)) = 0.995 g/mL
The average of these five determined density values,
(0.995 g/( mL) + 0.998 g/mL + 0.995 g/mL + 0.995 g/mL + 0.993 g/mL)/5 = 0.995 g/mL
was considered to be the density of the distilled water....

...DensityLab
Partners: Betty Alcaraz Date: 9/10/13
Teacher: Wright Class: 7th period
Introduction/Purpose: To determine the densities of unknown substances.
Pre-Lab:
1. Which is heavier, a pound of feathers or a pound of lead?
a. A pound of lead.
2. What is the density of a mineral if 427 g of the mineral occupy a volume of 35.0cm3?
b. 12.2g/cm3
3. The water level in a graduated cylinder stands at 20.0 mL before and at 26.2 mL after a 16.74 g metal sample is lowered into the cylinder. What is the density of the sample?
c. 1.2 g/mL
Safety: Used goggles.
Materials: Triple Beam Balancer, Water, Beaker instead of graduated cylinder, solid metal block, and goggles.
Procedures: | Observations |
1. Measure Mass using Triple Beam Balance | |
2. Measure Volume by using water displacement method. Fill a 50 mL graduated cylinder about half full with water, measure the volume, and record volume of water alone in Data Table 1. Measure the volume and record the measurement as “volume of water+sample” IN Data Table 1. Find the “volume of the solid” subtract volume of the “water alone” from the “volume of water+sample”. | When the block was placed into the water, it rised. |
3. Determine Density. Use the mass and the volume of the solid to determine the density. | |
Data Analysis & Results:
Data Table...

...
Period 0
DensityLab
Purpose
The purpose of the lab is to find out the density of stoppers, the density of a 100% sucrose solution, and to figure out the density and the percentage of sucrose in the unknown solution. To find out the density, the mass and volume needs to be measured for all three. Then, the mass will be divided by the volume. To find out the percentage of sucrose in the unknown solution, there has to be a comparison between the density of the unknown solution and the densities of different percentages of sucrose solutions.
Results
Density of Stoppers
Trial
Mass of Stopper (g)
Volume of Stopper (mL)
Density (g/mL)
1
6.0
4.9
1.2
2
4.1
3.2
1.3
Average Density
1.3
Density of 100% Sucrose Solution
Trial
Mass of Sample (g)
Volume of Sample (mL)
Density (g/mL)
1
49.4
44.2
1.12
2
61.0
54.1
1.13
Average Density
1.13
Density of Solution
Trial
Mass of Sample (g)
Volume of Sample (mL)
Density (g/mL)
1
55.4
52.1
1.06
2
32.5
31.1
1.05
Average Density
1.06
Actual Density for Different Percentages
Calculations
To find the density of the stopper for the first trial, 6.0 g was divided by 4.9 mL, which equals 1.2 g/mL. The...

...PRE-LAB REPORT
Lab: Density of Liquids and Solids
Purpose of the experiment:
The purpose of this lab is to help understand how to resolve the density of liquids and solids. Also, the lab is supposed to teach us how to record lab data and how to measure volume and mass the correct way. Lastly, it’s designed to help us understand significant values and its relationship to measurements and data recording.
Lab Techniques:
One technique that will be used during this lab is comparing the accuracy (absolute & percent errors) of your calculated densities to accepted literature values. Also, learn how to determine the precision for each of your measurements and compare results. We will find out the density of water, hexane, zinc, lead, copper and know which is the densest compared to the others.
Lab Procedures:
1. Obtain the mass of your 100-mL graduated cylinder. Make sure it is dry before you weigh it out.
2. Add 20-25 mL of distilled water to the graduated cylinder. Measure the volume of the water very carefully.
After: Measure the combined mass using an electronic balance.
3. Add another 20-25 mL of distilled water to the graduated cylinder. Measure it carefully.
4. Repeat step 3 to obtain a third set of mass and volume measurements....

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