Mass & Volume LabMass & Volume Lab In your lab notebooks, complete the following:In your lab notebooks, complete the following:

Problem Statement/Research QuestionProblem Statement/Research Question Give a prediction for your experimentGive a prediction for your experiment Experimental Design Diagram:Experimental Design Diagram:

Identify the IV, Levels, and trials in format outlined on the Identify the IV, Levels, and trials in format outlined on the handouthandout

Identify the DV for your experimentIdentify the DV for your experiment State what things you will attempt to keep constant during State what things you will attempt to keep constant during

your tests.your tests.

Experimental MethodExperimental Method List/bullet steps needed to measure your independent and List/bullet steps needed to measure your independent and

dependent variables.dependent variables.

Mass & Volume LabMass & Volume Lab Data Collection (Data Collection (take notes as you take notes as you

conduct the experimentconduct the experiment)) Collect quantitative data in an Collect quantitative data in an appropriate appropriate

tabletable Qualitative data underneath your table:Qualitative data underneath your table:

Notes on procedural stepsNotes on procedural steps, materials , materials actually used for measuring mass & actually used for measuring mass & volume of assigned objects. volume of assigned objects.

Relevant Relevant ObservationsObservations made during made during data collectiondata collection

Record data up front when done…Record data up front when done…

Mass & Volume ResultsMass & Volume Results Share data with groups who studied Share data with groups who studied

the same metal (i.e. orange metal, the same metal (i.e. orange metal, shiny metal) by posting information on shiny metal) by posting information on the paper @ central lab station.the paper @ central lab station.

Using a computer, plot all points (so Using a computer, plot all points (so we have more trials).we have more trials).

Whiteboard a Whiteboard a sketchsketch of your plot. If of your plot. If you notice a trend, draw it!you notice a trend, draw it! Sketch graphs = label units on axes, Sketch graphs = label units on axes,

sketch points or trends (you do not need sketch points or trends (you do not need #’s on axes)#’s on axes)

Mass & Volume Post-LabMass & Volume Post-Lab Using a computer, plot class data for Using a computer, plot class data for

your metal type (orange or shiny).your metal type (orange or shiny). Get a line of best fitGet a line of best fit Whiteboard a Whiteboard a sketchsketch of your plot. of your plot.

Sketch graphs = label units on axes, Sketch graphs = label units on axes, sketch in data points or trends (you sketch in data points or trends (you do not need #’s on axes, points do not need #’s on axes, points don’t need to be exact)don’t need to be exact)

Line of best fitLine of best fit i.e. relax there perfectionists!i.e. relax there perfectionists!

Graph Info for Labs:Graph Info for Labs:

In Notebooks:In Notebooks: Sketch the graph (title, labeled axes, general Sketch the graph (title, labeled axes, general

trend shown)trend shown) Write equation describing linear fit (substitute Write equation describing linear fit (substitute

appropriate variables and include units for slope appropriate variables and include units for slope and y-intercept)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 optionsCheck point protectors in graph options Uncheck connect points in graph optionsUncheck connect points in graph options Copy and paste graph to a Word Document and Copy and paste graph to a Word Document and

SaveSave

Linear equations for Scientific Linear equations for Scientific plots:plots:

1.1. Start with generic y = m x + b Start with generic y = m x + b

2.2. Replace y, and x with chemistry Replace y, and x with chemistry variables from the graph axes; variables from the graph axes; replace m and b with values replace m and b with values from analysis of graph for slope from analysis of graph for slope and intercept.and intercept.

What are numbers missing?What are numbers missing? Add Units!!!Add Units!!!

Linear equations for Scientific Linear equations for Scientific plots:plots:

3.3. Decide if b (y-intercept) is significant: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 5% of max Y value, Rule: if intercept is less than 5% of max Y value,

the intercept is negligible and you may drop it the intercept is negligible and you may drop it from the equation; from the equation;

if intercept is greater than 5% of max Y value, it is if intercept is greater than 5% of max Y value, it is significant and you must keep it as part of the final significant and you must keep it as part of the final equation. equation.

4.4. Write the final equation of the lineWrite the final equation of the line

%100max

Y

b

Mass & Volume ReportsMass & Volume Reports

Problem StatementProblem Statement Complete all sectionsComplete all sections

Experimental Design section:Experimental Design section: Include materials.Include materials. Labeled apparatus sketchLabeled apparatus sketch Detailed procedures, as developed and Detailed procedures, as developed and

used by your group (include any used by your group (include any refinements)refinements)

Mass & Volume ReportsMass & Volume Reports Data Collection:Data Collection:

Include Quantitative data you took as a group (RAW Include Quantitative data you took as a group (RAW data).data).

Include Qualitative dataInclude Qualitative data Use titles and headings! (include units)Use titles and headings! (include units) Precision will be checked for.Precision will be checked for.

Data Processing (Graph)Data Processing (Graph) Graph class data of only your metal (not both)Graph class data of only your metal (not both) Line of best fitLine of best fit 4 step process for writing equation (including 5% 4 step process for writing equation (including 5%

test). Include equation in data section and discuss test). Include equation in data section and discuss it in the conclusion.it in the conclusion.

% error calculation% error calculation

Mass & Volume ReportsMass & Volume Reports

ConclusionConclusion Make conclusions based on results. (i.e. Make conclusions based on results. (i.e.

what trend does the graph show? What what trend does the graph show? What relationship exists? How was it relationship exists? How was it modeled?)modeled?)

Explanation/Justification: What does the Explanation/Justification: What does the slope of the line mean? What is it slope of the line mean? What is it called? Was your slope value too high? called? Was your slope value too high? Too low? Explain!Too low? Explain!

Mass & Volume ReportsMass & Volume Reports

Evaluation (very important!)Evaluation (very important!) Procedure – what went well? Poorly? Be Procedure – what went well? Poorly? Be

critical of your procedures.critical of your procedures. Apparatus and materials. Were they Apparatus and materials. Were they

appropriate? What would be better?appropriate? What would be better? How could these things be improved to How could these things be improved to

better the experiment?better the experiment?