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Objective: To explore the initial steps of the scientific process in order to identify experimental variables and analyze procedures.

CSI Note: What is the difference between the independent variable and the

dependent variable?

Drill: 1. Write your name on the back of each data chart.2. Get a new lab from the SET. 3. Read the CSI Note and the Objective.

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Every Experiment begins with a research question.

Research QuestionWhat is the effect of the volume of a substance on the mass of the same substance?

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The research question includes variables that can change during the investigation. These variables are called the independent variable and dependent variable. The independent variable is the variable that is being controlled or manipulated. The dependent variable is the variable that reacts to the independent variable. It is often measured during the experiment or calculated from measured data.

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Ex. Problem Question: How does the angle of light affect the growth of plants?

Independent Variable: the angle of light (This is what the scientist is controlling.)

Dependent Variable: the growth of plant (This is what is being measured or calculated, and is based on the independent variable.)

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Identify the independent variable in the research question.

The volume of a substance.

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Identify the dependent variable in the research question.

The mass of the same substance.

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Writing the HypothesisA hypothesis is a possible answer to the research question. The hypothesis should include the predicted change that will occur when testing each variable. The hypothesis is written as follows. If ________________, then _______________ (The change the scientist controls (The change that results - the independent variable) -the dependent variable)  

because ______________________________. 

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Look at the problem question and write a hypothesis for this investigation.

If the volume of a substance is (increased/decreased), then the mass of that substance will ____________, because _______________________.

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Procedures include the steps you will take to test

the variables and complete the investigation.

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..\Luanne Cartoon - Ordering procedures.doc

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Explain why it is important to create procedures that are listed chronologically (in order according to time). Support your answer using prior knowledge of performing tasks.

There is a natural order for things. If you don’t follow a proper order, things won’t work out correctly.

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Lab Procedures Set 1 

a. Mass the empty graduated cylinder.b. Record the mass of the empty graduated cylinder In Chart 1, “The Effect of Volume on Mass of An Unknown Liquid.”c. Pour a volume of about 10 mL of mystery liquid into the graduated cylinder. Read and record the volume in Chart 1.d. Mass the graduated cylinder and the mystery liquid.e. Record the mass in Chart 1.f. Calculate the mass of just the liquid, and record the mass in Chart 1. (Subtract cylinder mass.)g. Repeat steps C-F for about 20, 30, 40, and 50 mL of mystery liquid.

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Lab Procedures Set 2

 First I should mass the empty graduated cylinder and recorded the information in Chart 1, “The Effect of Volume on Mass Of An Unknown Liquid.” Then, I poured a volume of about 10 mL into the graduated cylinder. Next, I massed the filled cylinder. After that I calculated the mass of just the liquid and recorded that mass on the chart. I repeated these steps for about 20, 30, 40, and 50 mL of liquid.

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Which set of procedures do you like the best? Justify

your response.

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EXIT SLIP

Variables

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Homework

Finish anything not completed in class.

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