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Science Lab

Essay Topic:

Purpose: To find out the densities and to find out the name of the unknown metals.(Based on the extensive and intensive properties) Check up the words mass, volume, density, extensive properties, and intensive properties.Where do the units for mass and volume) come from and what do they mean? What is the density of distilled water? What is Archimedes principle? Does temperature affect the density of a solid? Liquid? Gas? Materials: Safety glasses, 10, 25 or 50 mL graduated cylinders

Distilled water Metal Samples W, X,Y &amp; Z Procedure: 1.

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Class split into 5 groups. Every group will get data for four metals and tell it to the class 2. Choose a metal sample for every group then pass it around between groups. 3. Set a number of your metal sample and record the mass in the table. 4. Get a gradated cylinder with distilled water, but not to much to make it over flow when sample is put in. Record the amount of water in the cylinder accurately 5.

Then tip the cylinder to about 45 degrees then put sample into it slowly, DON’T spill any water or have to restart. Make sure no air bubbles are clinging. Then take down final volume of water cylinder. 6. Dump the water out, then dry sample off. 7. Repeat this over with the other metal samples. * Hypothesis: * My hypothesis is that even though I will find the densities and names of the unknown metals its not going to be accurate because some water will spill out.

Many people are going to come up with the different names because they aren’t care full enough. Mass of metal | | | | | | Initial volume of water | | | | | | Final volume | | | | | | Volume of metal | | | | | | ExperimentalDensity of metal | | | | | | Group Data| | | | | | | Metal W| Metal X| Metal Y| Metal Z| | Class Data: Mass and Volumes of each groups’ metal samples| Lab Group| Metal W| Metal X| Metal Y| Metal Z| 1| | | | | | | | | 2| | | | | | | | | 3| | | | | | | | | 4| | | | | | | | | 5| | | | | | | | | Total *| | | | | | | | | Class Exp.

Density *| | | | | * 1. Show an example of how your group calculated the experimental densities of your group samples and the class samples. 1. Graph the class data using mass as the x axis and volume as the y axis, (title the graph and make a legend or key for the various metal samples). 1. Compare your group’s experimental density to that of the class’s experimental density from the graph and make comment as to their relative accuracies. 1.

Research the possible identities of the metals based on their extensive properties (density, radioactivity, heat capacity, conductivity, lethal exposure/dosage, etc. ) and intensive properties (color, texture, luster, magnetism, reactivity, etc. ). 1. Make a claim as to the identity of the various metals based on their extensive and intensive properties. Calculate the % error for each of your claims for both your group’s experimental values and the class’s. Show an example of each type of calculation and make a table representing the organized results. *

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