Help with science lab!

Help with science lab!

Measurement and Density Your Name: ______________________________________________________________ Purpose of this Lab What is the goal of this lab? What question are you trying to answer, or what problem are you trying to explain? Hypothesis After reading the lab instructions – but before starting the lab – record your best “educated guess” about each experiment: Experiment 1: Which method of finding the density give you the least percent error and why? Experiment 2: After completing the first experiment, answer this question. Which block do you think has the highest density and why? Experimental Design List the materials used in this lab, and write a brief explanation of the procedures you followed. (You do not need to retype the procedure; simply summarize your procedures you used.) Materials: Procedures: © KC Distance Learning Data On the following pages record the data you collect in the lab. Show all calculations performed in the data analysis. Calculating Percent Error In most cases, the values you obtain through experimentation will be slightly different from the documented accepted values. Using very precise measuring devices and utilizing the measuring devices correctly reduces the amount of error. The calculation for % error is similar to the calculation you would use to determine your average on an exam. The formula for % error is listed below. Calculate the % error for each substance in experiments 1 and 2.

The accepted values are given in the table below (standard densities). The experimental values are the values you found in the lab. Percent Error = Experimental Value – Accepted Value x 100 Accepted Value Experiment-1 Measuring densities of the cubes using water overflow method. Mechanical Balance No. Red Cube Green Cube Blue Cube 1 Graduated Cylinder No. Red Cube Green Cube Blue Cube 1 2 3 4 5 Average Volume Cube Mass (in grams) Volume (cm3 ) Density( g/ cm3 ) =Mass/Volume Element Present Red Green Blue Element Standard Density (g/cm3 ) Calculated Density (g/cm3 ) Iron 7.8 Copper 8.9 Zinc 7.1 © KC Distance Learning Experiment-2 Measure densities of the cubes using Vernier Calipers and Digital Weighing balance. Digital Balance No. Red Cube Green Cube Blue Cube 1 2 3 4 5 Average mass Vernier Caliper No. Red Cube Length (L) Width (W) Height (H) L x W x H 1 2 3 4 5 Average Volume

Green Cube No. Length (L) Width (W) Height (H) L x W x H 1 2 3 4 5 Average Volume

Blue Cube No. Length (L) Width (W) Height (H) L x W x H 1 2 3 4 5 Average Volume

© KC Distance Learning Cube Mass (in grams) Volume (cm3 ) Density( g/ cm3 ) =Mass/Volume Element Present Red Green Blue Element Standard Density (g/cm3 ) Calculated Density (g/cm3 ) Iron 7.86 Copper 8.96 Zinc 7.13 © KC Distance Learning Data Analysis Analyze the data you collected in the lab. Support your calculated densities by showing the calculations that lead you to your results. Calculate your percent error and compare your percent error from experiment 1 to your percent error in experiment 2. Don’t forget to include all of your density and percent error calculations in this section of the report. © KC Distance Learning Conclusion After conducting the experiment, how would you now explain the problem(s) or answer the question(s) raised when you described the purpose of the lab? Do your results support your hypothesis? Why or why not? Be sure to base your answer on the data you collected. Consider whether your conclusion is the only explanation for the data you collected, or if there could be alternate explanations.

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