A) Discuss Density and Explain Why Some Substances Are Denser Than Others

NAME______DATE _____

REGENTS CHEMISTRY 9/11-17/08

LAB # 1 DENSITY

ABSTRACT: INTRODUCTION:

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.

D) Discuss the equation for calculating percent error, explain sources of error and the terms accuracy and precision.

A) List the masses and volumes from your lab.

CALCULATIONS:

B) Calculate the density of each metal cylinder with proper rounding of the answer.

DISCUSSION;

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.