Lab Report 2Does It All Add Up?

Title Page

Name of Lab, Name of Student, Date, Period, Subject

Name of Lab: Does It All Add Up?

The Rest should be self explanatory

Purpose/Hypothesis

Started on a new page……Purpose:

What do you think it is?Give Some examples?To determine what would happen

when mixing Liquid A and Liquid B.

Purpose/Hypothesis

Hypothesis:As a group you developed this….Your perdition will work as well…..

Purpose/Hypothesis

After observing what happens when two 25 mL volumes of Liquid A were combined as well as Liquid B the combined volume of Liquid A and B will be 50 mL, appearance will stay the same, as well as the temperature.

If I combine Liquid A and Liquid B then the volume will be 50 mL, appearance will stay the same, as well as the temperature.

Pre-Lab Questions

Question 1 and 2 of the lab reporting form are pre-lab-questions that belong in this section.

Materials

Contains a complete list of all the material used in the lab.

A 100 mL beaker of liquid A and liquid B Three graduated cylinders (at least 50 mL) Paper towels for clean up Lab reporting form Pencil Disposable gloves Lab apron Safety glasses

Methods, Procedures & Safety Issues

Give me example of the procedures your group use.

Methods, Procedures & Safety Issues

Safety IssuesBoth the liquids are unknown and

there for can be dangerous if exposed to skin, eyes, ingested, or inhaled. Safety glasses, gloves, and lab aprons should be worn at all times.

Any other concerns you can think of?

Methods, Procedures & Safety Issues

Methods/Procedures Obtain all materials needed lab First put on your safety goggles, gloves, and lab

apron Next observe Liquid A and Liquid B in their

beakers

Methods/Procedures

Pour exactly 25 mL of liquid A from the beaker into each of two 50 mL graduated cylinders. Combine these samples in one of the graduated cylinders. Record the final volume. Pour the liquid back into the beaker of liquid A. Rinse the graduated cylinders. Repeat this step for liquid B

Methods/Procedures

After those observations form a hypothesis and prediction for what will happen if 25 mL of liquid A are combined with 25 mL of liquid B.

Next test your hypothesis using the following procedures. Use the data table record your data. Mark one graduated cylinder “A.”

Methods/Procedures

Carefully pour exactly 25 mL of liquid A into this cylinder. In your data table, record its volume, appearance, and temperature.

Mark another graduated cylinder “B.” Carefully pour exactly 25 mL of liquid B into this

cylinder. Record its volume, appearance, and temperature in your data table.

Mark the empty third cylinder “A 1 B.” In the “Mixing results: predictions” column in your

table, record the prediction you made earlier. Each classmate may have made a different prediction.

Methods/Procedures

Carefully pour the contents of both cylinders into the third graduated cylinder.

Observe and record the total volume, appearance, and temperature in the “Mixing results: observations” column of your table

Data tables and/orGraphs

Data Table

Contents of Cylinder A

Contents of Cylinder B

Mixing results: predictions

Mixing results observations

Volume 25 mL 25 mL 50 mL 48 mL

Appearance Clear, still Clear, Still Clear, Still First: Cloudy and bubblyThen: clear and still

Temperature ⁰C 22 22 22 27 max after liquid mixture cleared.

There isn’t enough data or variety to justify using making a graph.

Data tables and/orGraphs

Data Tables should be well organized and easily understandable. It should also be properly labeled in order to improve clarity.

Graphs should fit the data that it represents. Should be labeled in a way to present the information in a clear and understand able way.

Discussion and Analysis

Contains a detailed and accurate account of the data.

What is the data saying… What do you get from it?

What happen when you combined the liquids?

What is the Data table showing Use the Data in the discussion.

Discussion and Analysis

Use the analyze and draw conclusion question from the lab reporting form to help with this section.

Mixing the two liquids A and B ended up with a surprising result. The volume didn’t add up to 50 mL. It turned cloudy at first then cleared up, and the temperature increased. The biggest question was why didn’t the two liquids add up to 50 mL. We did the procedures for mixing the two again to double check the results.

Discussion and Analysis

The second trial resulted in similar results. Other question that were raised “why did it go cloudy then clear and what caused the temperature to rise?” Mr. M demonstrated how the molecules of alcohol fit in-between the water molecules allowing a decreased total volume. He also explained that the cloudiness and temperature increase were do to a chemical reaction between alcohol and water.

Conclusion

Clearly states whether hypothesis is accepted or rejected Identifies:

sources of error concepts learned

My hypothesis was not supported because the volume was not 50 mL, clear, and the same temperature. There could have been possible errors due to inaccurate measurements the liquid volume.

Conclusion

I also learned that 2 +2 doesn’t always = 4. Do to different molecular sizes one molecule could be smaller then another causing them to fit between the larger molecules showing a lower combined volume.