Virtual Lab - Rates of Reaction

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Before we begin- some instructions:

Virtual Lab - Rate of Chemical Reactions

The slides should guide you through, but if you get lost- this button will always bring you back to the main lab where you can navigate to where you need to be.

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Click the pencil here to draw on the slide. You'll need this to record your data. When you unclick it- the drawings disappear. They reappear when you click it again. Try it out!

Virtual Lab - Rate of Chemical Reactions

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Virtual Lab - Rate of Chemical Reactions

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Check the bulletin board to see what we're working on today.

Welcome to the lab!

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Check your lab notebook for the materials and procedure

Lab investigation about rates of chemical reactions

Today's Agenda:

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What is Surface Area?

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What is Alka Selzter?

Next Page:

It is a measurement of how much surface is exposed on an object.

What is surface area?

If you break an object into smaller pieces, you increase the surface area. This is because there are more pieces of the same amount of substance, therefore more surface area has been created.

What is surface area?

This is the chemistry of the reaction

Alka seltzer is an antacid that mainly consists of baking soda, citric acid, and asprin. People take it for heartburn or upset stomach. The baking soda & citric acid react together when mixed with water. The asprin is a pain reliever.

What is Alka Selzter?

In this notebook you will find your lab materials and procedure. You can record your data here intially but you will also need to write it in your lab report. You will also record your observations, data analysis & conclusion in your lab report.Answer the pre-lab questions and then to perform the experiment, go back to the main lab and find the area with your materials. (You can navigate to the different trials in the "Record Data" section)

Conclusion

Data Analysis

Record Data

Experiment / Observations

Lab Procedure

Lab Materials

Pre-Lab Thoughts

Science Lab Notebook

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Answer/record this on your lab report to be handed in!

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3. In this experiement, we will be doing multiple trials of the same thing. (We will be testing the same thing a few times). Why do you think this is important?

* To learn more about what alka seltzer is- go back to the lab and do research on the computer

1. What do you know about alka selzter? Do you know what it is or what it does in water? Write down your prior knowledge without researching.

2. Do you have any ideas about what could influence the rate of a chemical reaction? (For instance- make it go faster or slower?)

Pre Lab Questions to be answered:

Today we are going to investigate what variables influence the rate of a chemical reaction. The chemical reaction we will observe is dissolving alka-seltzer tablets in water. ** Answer these pre-lab questions on your lab report before you continue onto the experiment.

Today's Lab:

Today we are going to investigate what variables influence the rate of a chemical reaction. The chemical reaction we will observe is the dissolving of alka-seltzer tablets in water. We will record our data, study our findings, and come to a conclusion about what can influence the rate of a chemical reaction.

Today's Lab:

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Gather Materials

Timer

Beakers

Water

9 Alka Seltzer tablets

Materials

Today we are going to investigate what variables influence the rate of a chemical reaction. The chemical reaction we will observe is the dissolving of alka-seltzer tablets in water. We will record our data, study our findings, and come to a conclusion about what can influence the rate of a chemical reaction.

Today's Lab:

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Gather Materials

Timer

Beakers

Water

9 Alka Seltzer tablets

Materials

Check off the materials and go back

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For each condition, perform 3 trials of the following: 1. Drop substance into container. 2. Add 150 ml of room temperature water.3. Observe until tablet completely dissolves. (Hint- This can be when you don't see the tablet anymore, or if the majority of the bubbling has stopped (i.e. the reaction finished). 4. Record the time in seconds in the data table.

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Three conditions of substance: Whole, Broken (pieces), Crushed (powder)

Procedure

Investigation Question: How does surface area affect the rate of a chemical reaction?The variable we will be focusing on is surface area. Check the lab computer for some more information on surface area.

Today's Lab:

Trial 3

Trial 2

Trial 1

Trial 3

Trial 2

Trial 1

Trial 3

Trial 2

Trial 1

Crushed Tablet

Broken Tablet

Whole Tablet

Crushed Tablet

Broken Tablet

Whole Tablet

Conditions:

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Time to Dissolve (s)

Substance

Data - Part 1

Investigation question: How does surface area affect the rate of a chemical reaction?We will do three trials of each condition and get the average for a represenatative value. (you can navigate to the trials by clicking them in the table)When you are done recording your data, continue to the data analysis section to see how we will work with our data.

Today's Lab:

Time to Dissolve (s)

Substance

Crushed Tablet

Broken Tablet

Whole Tablet

For each of the conditions, we need a representative number (one number, not 3!) Get an average of the three trial times: (Trial 1 + Trial 2 + Trial 3) / 3*Fill out this information on your lab report to be handed in.

Trial 3

Trial 2

Trial 1

Trial 3

Trial 2

Trial 1

Trial 3

Trial 2

Trial 1

Whole Tablet

Crushed Tablet

Broken Tablet

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Back to Data

Average Time to Dissolve (s)

Substance

Data - Part 1

Data Analysis

Next Trial

1. Start the timer when the water is added. 2. Time until tablet dissolves completely. (No more big bubbles / fizzing)3. Record your data (time in seconds). 4. Continue to next trial.

Whole TabletTrial 1

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Record Data

Next Trial

Dont forget to record your data!

Whole TabletTrial 2

Return to procedure

Record Data

Whole TabletTrial 3

Return to procedure

Record Data

Next Trial

Broken TabletTrial 1

Return to procedure

Record Data

Next Trial

Broken TabletTrial 2

Return to procedure

Record Data

Broken TabletTrial 3

Return to procedure

Record Data

Next Trial

Crushed TabletTrial 1

Return to procedure

Record Data

Next Trial

Crushed TabletTrial 2

Return to procedure

Record Data

Crushed TabletTrial 3

Return to procedure

Record Data

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