Density Lab Essay

Submitted By fionaharley
Words: 1625
Pages: 7
Open Document
Experiment: Density and the Treatment of Data

Purpose: To demonstrate the density characteristic at its given temperature and pressure. By measuring the liquid’s mass and volume, density can be determined with its physical property and its specific value.

Theory: The mass and the volume of any object can be measured. However, the separate measurements do not tell us how tightly packed the substance might be. If we compare the mass of the object to its volume, we obtain a relationship called density. The density was calculated by dividing the mass of the cube by its volume. The independent variable in this experiment is the volume of the liquid, while the dependent variable is the density of the material. Two important control variables in this experiment are the material and the shape of the test samples.

The Important reactions are:

Density = Mass of Substance__ Volume of Substance

Procedure:

1.) Determination of the density of a metal
• Obtain a metal slug then record its weight.
• Fill a 50mL using a graduated cylinder → record its weight; then roll the metal slug into the cylinder → record weight on the data. Repeat to get 3 trial samples.

2.) Calibration of pipets
• Measure the mass of a clean & dry 50mL Erlenmeyer flask with a stopper
• Using a pipet, measure 10mL of deionized water then pour into weighed flask /stopper.
• Repeat to get 3 trial samples. Obtain the water temperature → record necessary data.

3.) Determination of the density of a liquid
• Obtain about 40mL unknown liquid→ record the unknown number for the liquid.
• Using a pipet, measure 10mL of unknown liquid then pour into weighed flask /stopper and weight unknown liquid with it → record weight on the data.
• Repeat to get 3 trial samples. → record weight on the data.

Problems Encountered/Sources of Error:

A source of error in this experiment is the measurement of the volume of the water after dropping the metal slug. When the metal slug was dropped into the graduated cylinder water tended to splash out. This made the volume of the slug smaller than it really was and the density of the cube larger than the actual value.

Discussion of Results and Conclusions:

Based on the results of different liquids/substances that we used and the three trial samples; the result of this experiment show that changing the volume of a liquid does not affect the density of the material. Measurements will be performed on three samples of water to improve precision and accuracy. Mass will be measured with an electronic balance, in grams (g), and volume will be measured directly with a graduated cylinder, in milliliters (mL). Recall that when measuring liquid volumes, the graduated scale must be read from the lowest point of the curved surface of the liquid (the meniscus). The accuracy of the experimentally determined density of water will then be evaluated by comparison to the true, accepted density of water.

Post Lab Questions:

1. ) GIVEN: The initial mass is 34.5 kg = 3450g
Volume = 3450g * (mL / 13.6g) = 253.68mL

2.) Since the flask that we used initially was not completely dry, it may create some discrepancies in our data entry. Nevertheless, the Erlenmeyer flask has calibration lines every 50 mL between 200 and 500 mL. ; therefore, the error maybe within ±5%. To determine the size of the flask needed during an experiment, determine the maximum amount of liquid the flask needs to contain. Multiply that number by two and select a flask size that comes closest to that number.

3.) He had under estimated the weight of the bag of sand. Since the gold is much heavier in mass weight he was not successful in fooling the tomb. He could have put more sand into the bag to get the same weight as the gold but it may take him longer to gather more sand or he may need a whole lot of bags of sand to have a substantial weight as the gold.

4.)
Show More

Related Documents: Density Lab Essay

density lab Essay

Lab 1 : Density Objective : To determine an unknown metal by calculating its density. Abstract: An old riddle asks, “which is heavier, a pound if feathers or a pound of lead?” The answer to the question is obviously, the same. But even though they have the same mass, there is clearly something different about the small lead brick and the large bag of feathers. To answer this, you first have to understand the relationship between the substance’s mass and…

Words 364 - Pages 2

Coke Density Lab

In this lab, we explored density, which is defined as “the degree of compactness in a substance.” To calculate density, one would take the mass of an object and divide that number by the object’s volume. The higher the number after doing the calculation, the higher the density, meaning an object with a high density would be considered more compact or concentrated than an object with a lower density. This lab was designed to investigate the differences in densities between regular Coke and Diet Coke…

Words 537 - Pages 3

Lab Report On Density

I have completed this lab report in accordance with the NA Honor Code. X_______________________________________________________ An Introduction to Calculating Density Introduction: Purpose: To determine the density of different substances using mass and volume measurements that have been calculated. Also, to familiarize oneself with the materials in the laboratory and to investigate the precision of measurements using precision of error. Hypothesis: If the density of a solid and of a liquid…

Words 1492 - Pages 6

Lab 6 Exploring Density Lab Answers

. CHM130 Lab 6 Exploring Density Name: Nolan Strommer A. Data Tables Place your completed Data Tables here: Part IIIa (3 points) Volume of water in graduated cylinder (mL) 10 mL Mass of rubber stopper (g) 11.35 g Volume of water and rubber stopper (mL) 17 mL Part IIIb (6 points) Volume of water in graduated cylinder (mL) 8cm Mass of iron nail (g) 3.51g Volume of water and iron nail (mL) 8.3 mL Part IV (20 points) Type of Aluminum Foil Mass (g) Length (cm) Width (cm) Volume…

Words 1472 - Pages 6

Density Lab Outline Essay

Substances Using Density DUE DATE: March 12th, 2015. The purpose of writing a lab report is to provide a blueprint for another scientist to repeat your experiment and get the same results. A COPY OF THIS DOCUMENT incl. the finished PRE-LAB SECTIONis due on FORMAL LAB DAY! Written work should never be copied from other groups. Use your own words! Read skills section in back of text. Make sure you are familiar with using a graduated cylinder and an electronic balance and how to write a lab report (see…

Words 2481 - Pages 10

Chemistry Density Lab Essay

Renee Hairston POST-LAB 9/11/14 Determination of Unknown Density Lab Lab Partner: Kelsee Rieghman I. Objectives/Purpose During this particular lab experiment I expect to determine the density of both a liquid and a solid to find out what the unknown substances are by matching it’s density with one of the densities of the 3 metals listed in our packet, and also determine what the unknown liquid will be based on its density and the given information in our packet. II. Safety…

Words 576 - Pages 3

Essay on Whap: Volume and Density

Measuring Density Lab Anna Gerteisen 9/3/12 Introduction: Background Information “Mass is a measure of the amount of matter an object has”(Measuring Density Lab 1.) Different materials will have different mass, and there are multiple units that can be used to measure mass like grams, kilograms, pounds, or ounces. “Volume is the amount of space an object occupies”(Measuring Density Lab 1) Volume can also be measured in multiple units like liters, meters cubed, gallons, quarts, cubic centimeters…

Words 569 - Pages 3

Mass post lab Essay

Meredith Williams period 3 Smith Mass, Volume, and Density Lab September 22, 2014 Group: Meredith Williams, Marina Fernandez, Arjun Dharmait, and Ellen Lyons Station 1 Meredith Williams period 3 Smith V. Results and Conclusion Question 1. The Experiment completed in this lab demonstrates density of a substance is that density is smaller than the substances mass. Different substances have different densities because Density= mass/volume, so if the value of mass and volume…

Words 367 - Pages 2

Day of empire Essay

Micah Alberts Graphical Method for Calculating Density 9/10/14 I. Purpose To graphically determine the density of two different substances. Class data will be used so as to include multiple trials. II. Safety Proper safety precautions for this lab is to wear goggles, keep substance a safe distance from mouth and nose. III. Prelab Questions 1. Calculate the slope of the line in the graph above. Use the rise over run method. If you don’t know how, ask a friend or look it up…

Words 621 - Pages 3

Collage: Concentration and Percent Sugar Essay

Beverage Density Lab Data Table A. Density of Reference Solutions Solution Mass, g Sample Volume, mL Density, g/mL 0% Sugar 9.849g 10.00 .0985g 5% Sugar 10.05g 10.00 1.005g 10% Sugar 10.25g 10.00 1.025g 15% Sugar 10.49g 10.00 1.049g 20% Sugar 10.64g 10.00 1.064g Data Table B. Beverage Densities Beverage Mass, g Sample Volume, mL Density, g/mL Minute Maid Lemonade 10.38g 10.00 1.038g Ocean spray cranberry 10.34g 10.00 1.034g Results Table Beverage…

Words 396 - Pages 2