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Check out our Video of this IPS experiment!

 

This lab was completed by

Kaitlyn

Libby

Ryan

Zachary

Danielle

Kobe

 

Lab Section 2.6

ĎThe Mass of a Gasí

 

 

Question:

Is there a change in mass after a solid and a liquid are turned into a gas?

 

Hypothesis:

If the seltzer tablet is inserted to the water, then the mass of the bottle will decrease because the water will turn into gas.

 

Independent Variable:

State of matter of the Alka-Seltzer

 

Dependent Variable:

Mass of Alka-Seltzer

 

Constants:

      Amount of water

      Size of seltzer tab

      Bottle

      Temperature of water

 

Materials:

      1 alka seltzer tablet (mass and divide into ⅛ mass)

      1 thick walled bottle with cap

      1 roll of tape

      Water (measure by ⅓ of bottle)

      5 pairs of safety goggles

      1 scale

      1 graduated cylinder

      1 knife

 

Procedure:

1.    Gather materials

2.    Fill bottle ⅓ of the way full with water.

3.    Measure mass of bottle, water, its cap, and ⅛ of the seltzer tablet.

4.    Drop ⅛ of the seltzer tab in bottle and screw on cap very tightly.

5.    Let seltzer tablet sit in water for 2 minutes.

6.    Place back on the scale to measure mass.

7.    Slowly loosen cap.

8.    Mass the cap, bottle, and contents.

9.    Repeat steps 2 through 7 three more times.

 

Data Table

 

Trial:

Before(g):

After (g):

Change:

1

70.8

70.7

-0.1

2

73

73.1

0.1

3

72.7

72.6

-0.1

4

72

71.8

-0.2

5

73.1

73

-0.1

6

72.1

72.1

0

7

72.8

72.9

0.1

8

72.9

72.6

-0.3

9

70.6

70.8

0.2

10

70.5

70.7

0.2

11

73.2

73.4

0.2

12

70.6

71.4

-0.2

13

71.4

71.3

-0.1

Average:

71.97

72.03

-0.015

 

 

Graph:

 

 

graph.png

 

 

Conclusion:

 

Our hypothesis was incorrect. It was wrong because the mass actually stayed the same throughout the trials based on the scale we used. There was an average decrease of 0.015 grams throughout our trials, which we didnít consider a significant enough change. The scale we used only showed us decimal points up to the tenths place which prevented us from seeing the complete change of mass. Based off our data, our hypothesis was wrong. If we were to repeat this experiment again, we would use a more sensitive scale. This would enable us to get an exact number for the change of mass for each trial therefore giving us more clear data.

 

 

 

 

Errors and Reliability:

 

One source of error is that the scale wasnít sensitive enough. It measured to .1 grams. We were not able to get an exact number for the change because of the scale we used. Another source of error was how we massed our materials separately, rather than together at the beginning. This affected the mass because the scale added weight to the materials all together, rather than that number staying the same. Our conclusion is very reliable. As a group we completed the lab over ten times with consistent data. If we would repeat this experiment we would use a more sensitive scale thus giving us more precise data.

 

Pictures:

Screenshot_2015-05-12-10-51-26.png

 

Featuring: Kobe

Screenshot_2015-05-12-10-52-36.png

Cap

 

 

Screenshot_2015-05-12-10-53-43.png

Alka Seltzer

 

Screenshot_2015-05-13-10-52-59.png

Bottle