Mass & Volume Lab: Measuring Volume We are making new groups We are making new groups Take out your lab notebooks. Write the DQ: How does the volume of a substance relate to its mass? Take out your lab notebooks. Write the DQ: How does the volume of a substance relate to its mass? Go to the lab stations Go to the lab stations Discuss at least two ways to measure the volume of the metal cylinders at your lab station Discuss at least two ways to measure the volume of the metal cylinders at your lab station Record notes in your lab notebook. Record notes in your lab notebook.

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

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

8/13/15 Place Unit 1A HW Packet in the basket Place Unit 1A HW Packet in the basket Period 2 – Turn in your citizenship paper and health info paper, if you have not yet done that Period 2 – Turn in your citizenship paper and health info paper, if you have not yet done that Go to the lab station and work on your procedures for the mass and volume lab. Go to the lab station and work on your procedures for the mass and volume lab.

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

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

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

Discussion Points How would you describe the relationship between these two variables? How would you describe the relationship between these two variables? What is the physical meaning of the slope? What are the units for slope? What is the physical meaning of the slope? What are the units for slope? Should this metal always have the same slope? Should this metal always have the same slope? What are the units for the y-intercept? What are the units for the y-intercept? Theoretically, should there be a y-intercept? If not, why is there a y-intercept? Theoretically, should there be a y-intercept? If not, why is there a y-intercept?

Linear equations for Scientific plots: 1.Start with generic y = m x + b 2.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? What are the numbers missing? Add Units!!! Add Units!!!

Linear equations for Scientific plots: 3.Decide if b (y-intercept) is significant: 5% Test: 5% Test: (Y-max = largest y value from data table) (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; 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. if intercept is greater than 5% of max Y value, it is significant and you must keep it as part of the final equation. 4.Write the final equation of the line

Percent Error How far off the results are from the actual value How far off the results are from the actual value Percent error = |observed – actual| X 100 Percent error = |observed – actual| X 100 actual actual

Mass & Volume Report Experimental Background Experimental Background Complete all sections Complete all sections Apparatus and Method sections: Apparatus and Method sections: Include materials. Include materials. Labeled apparatus sketch in ink Labeled apparatus sketch in ink Detailed procedures, as developed and used by your group (include any refinements) Detailed procedures, as developed and used by your group (include any refinements)

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

Mass & Volume Report Conclusion Conclusion Make conclusions based on results. (i.e. what trend does the graph show? What relationship exists? How was it modeled?) Make conclusions based on results. (i.e. what trend does the graph show? What relationship exists? How was it modeled?) Explanation/Justification: What does the slope of the line mean? What is it called? Was your slope value too high? Too low? Explain! 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 Evaluation (very important!) – make two paragraphs following the conclusions Identify the limitations of the procedures and materials Identify the limitations of the procedures and materials Discuss how these limitations affect the results Discuss how these limitations affect the results How could these things be improved to better the experiment? How could these things be improved to better the experiment?