Mass & Volume Lab: Measuring Volume

1. Mass & Volume Lab:Measuring Volume • Take out a piece of paper. Write the DQ: How does the volume of a substance relate to its mass? • Go to the lab stations • Discuss at least two ways to measure the volume of the metal cylinders at your lab station • Record notes on your paper.

2. Mass & Volume Lab • Causal Question: How do measures of mass and volume relate to one another?

3. Mass & Volume Lab • On your paper, complete the following: • Problem Statement/Research Question • Give a prediction for your experiment (graph) • Experimental Design • Identify the IV and Levels • Identify the DV for your experiment • State what things you will attempt to keep constant during your tests. • Experimental Method • List/bullet steps needed to measure your independent and dependent variables.

4. Mass & Volume Lab • Data Collection (take notes as you conduct the experiment) • Collect quantitative data in an appropriate table • Qualitative data underneath your table: • Notes on procedural steps, materials actually used for measuring mass & volume of assigned objects. • Relevant Observations made during data collection • Record data in class data table when done…

5. Mass & Volume Post-Lab • Using Logger Pro, Excel or a graphing calculator, plot class data for your metal type (orange or shiny). • Whiteboard a sketch of your plot. • Sketch graphs = label units on axes, sketch in data points or trends (you do not need #’s on axes, points don’t need to be exact) • Write the equation of the line (curve) with correct variables and units • i.e. relax there perfectionists!

6. Graph Info for Labs: • On your paper: • Sketch the graph (title, labeled axes, general trend shown) • Write equation describing linear fit (substitute appropriate variables and include units for slope and y-intercept) • For Lab Report: • Autoscale graph from Zero (0,0 origin) • Check point protectors in graph options • Uncheck connect points in graph options • Copy and paste graph to a Word Document and Save

7. Linear equations for Scientific plots: • Start with generic y = m x + b • Replace y, and x with chemistry variables from the graph axes; replace m and b with values from analysis of graph for slope and intercept. • What are the numbers missing? • Add Units!!!

8. Linear equations for Scientific plots: • Decide if b (y-intercept) is significant: • 5% Test: • (Y-max = largest y value from data table) • Rule: if intercept is less than or = 5% of max Y value, the intercept is negligible and you may drop it from the equation; • if intercept is greater than 5% of max Y value, it is significant and you must keep it as part of the final equation. • Write the final equation of the line

9. Mass & Volume Report • Data Collection: • Include Quantitative data you took as a group (RAW data). • Include Qualitative data • Use titles and headings! (include units and uncertainty) • Precision will be checked for. • Data Processing • Table with class data (indicated in title) for your metal only • Graph class data of only your metal (not both) • Line of best fit • Include equation under the graph and discuss it in the conclusion. • % error calculation

10. Mass & Volume Report • Conclusion • Make conclusions based on results. (i.e. what trend does the graph show? What relationship exist?) • Explanation/Justification: What does the slope of the line mean? What is it called? Was your slope value too high? Too low? Explain!

11. Mass & Volume Report • Evaluation (very important!) – make two paragraphs following the conclusions • Identify the limitations of the procedures and materials • Discuss how these limitations affect the results • How could these things be improved to better the experiment?