## Lab Report Essay

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9/26/13
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 is calculated then the solid will be denser than the liquid. Theory: This experiment involves analyzing quantitative data that has been measured. Significant figures were calculated in order to show the precision of the experiment. Also, students compared two densities together by finding the measurements of the mass and volume. The equation for calculating density is mass divided by the volume. Density itself is the quantity or mass of an object in a given space (volume). Mass is the amount of matter in an object and volume is the amount of space it occupies. This lab looks at density of water, alcohol (ethanol), and a metal (copper). Percent error is used to calculate how precise and instrument is. The accepted value is subtracted from the experimental value and then divided by the accepted value. The smaller the number the more precise. A negative indicates less than the value and positive is over the value. Variables: The independent variable is the volume of the liquid. The dependent variable is the mass that is changing with the volume. For the metals it is actually the opposite. The independent variable is the mass with the metal, so therefore the dependent variable is volume of the liquid in the cylinder. The controlled variables are the scale and the significant figures, the room temperature, the...