Mass & Volume Lab: Measuring Volume

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Presentation transcript:

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.

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

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.

Mass & Volume Lab Record data in class data table when done… 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…

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!

Graph Info for Labs: On your paper: For Lab Report: 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

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!!!

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

Mass & Volume Report Data Collection: Data Processing 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

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!

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?