Density+Lab

Chemistry Name________________________________________ ** DENSITY LAB  ** **__Abstract__** - Density is defined as mass divided by volume. It is an intensive property, thus the density can be calculated given any sample size. **__Purpose__** -The purpose of this lab is to calculate the density of the material used in the U.S. penny. Graduated cylinder Balance Pennies 1. Determine how many pennies your group will use as a sample size. (Each lab group will have a different number). 2. Measure the mass of the sample and record data. // **(to determine mass, simply weigh the pennies)** // 3. Pour about **l0 mL** of water in the graduated cylinder. 4. Record actual measurement of water. 5. Place pennies in the water in the graduated cylinder 6. Record the measurement of water + pennies in the graduated cylinder. (**//how high is the water line with the pennies in the water?)//** 7. Calculated the volume of the pennies. Volume (water + pennies) – Volume (water) 8. Calculate the density of the penny material **//(mass of sample – column 2 divided by volume of sample – column 5)//** 9. Return pennies and obtain another sample of pennies (same quantity, different pennies). 10. Repeat procedure until the data for 5 samples has been obtained. Number of pennies in sample __________________________ ** Mass of Sample (g) ** || ||  ||  ** 10 ** ||   ||   ||   ||  ||   ||  ** 10 ** ||   ||   ||   ||  ||   ||  ** 10 ** ||   ||   ||   ||  ||   ||  ** 10 ** ||   ||   ||   ||  ||   ||  ** 10 ** ||   ||   ||   || 11. Calculate the average density of the material and compare data with other lab groups. //(add all the Density of Sample totals, and divide them by the number of Samples used)// Average Density _______________________________________________________ ** Group Number ** || ||  ||   ||  ||   ||   ||  ||   ||   ||  ||   ||   ||  ||   ||   ||  ||   ||   || Based on the data that was obtained; write a short paragraph explaining your results and how it pertains to density and intensive/extensive properties. (Note: if it looks like there might be some error in your data, indicate as such and possible causes. effects of those errors).
 * __ Apparatus and Materials __**
 * __ Procedure __**
 * __ Data and Calculations __**
 * Sample # ** ||
 * Sample # ** ||
 * Vol. of Water (mL) ** ||
 * Vol. of Water and Sample (mL) ** ||
 * Vol. of Sample (mL) ** ||
 * Density of Sample (g/mL) ** ||
 * Number of Pennies in Sample ** ||
 * Average Density of Sample ** ||
 * __ Conclusion __**