<p>NAME______DATE _____</p><p>REGENTS CHEMISTRY 9/11-17/08</p><p>LAB # 1 DENSITY</p><p>ABSTRACT: INTRODUCTION:</p><p>A) Discuss density and explain why some substances are denser than others. B) Discuss the rules for determining significant figures in a measurement. C) SKILLS…. Write instructions for rounding in the following operations; give two examples each with stepwise instructions for the rounding. a. Addition b. Subtraction c. Multiplication d. Division.</p><p>D) Discuss the equation for calculating percent error, explain sources of error and the terms accuracy and precision.</p><p>DATA:</p><p>A) List the masses and volumes from your lab.</p><p>CALCULATIONS:</p><p>B) Calculate the density of each metal cylinder with proper rounding of the answer.</p><p>DISCUSSION;</p><p>A) Discuss percent error in your density measurements. Discuss why the elements (iron, copper, aluminum) and a constant density while the brass (a mixture called an alloy) my have variable densities between samples.</p>