Lab 5
docx
keyboard_arrow_up
School
Hill College *
*We aren’t endorsed by this school
Course
MISC
Subject
Mathematics
Date
Apr 3, 2024
Type
docx
Pages
6
Uploaded by ColonelWaterBuffalo4154
Faster Plop, Plop, Fizz, Fizz: A Scientific Method
Investigation
Student Name
Harley Miller
Date
2/5/24
1
Data
Activity 1
1.
State a hypothesis for Activity 1 using an “if/then” statement. Remember to create a statement that can be tested empirically.
a.
If I add an Alka-Seltzer tablet to hot water, it dissolves faster than in cold or room temperature water.
Data Table 1
Run
No.
Cup
Temp. (˚C)
Time (sec.)
Observations
1
C 10
123
Tablet was at the bottom 1
RT 20
47
A couple of seconds for the tablet to
dissolve 1
H
45
19
Tablet floated quickly 2
C
12
102
The tablet was at the bottom moving
around. 2
RT
25
43
Table moved around the cup 2
H
56
20
A lot of bubbles
3
C
7
116
Fizzing noise
3
RT
25
45
Fizzing noise
3
H
51
26
Fizzing noise
Avg.
C
9.6
223
Avg.
RT
23.3
45
Avg.
H
50.6
28
2.
Using graphing software such as Excel
®
, graph the results of Activity 1. Please see the Introduction to Graphing manual for guidance.
© 2016 Carolina Biological Supply Company
2
0
2
4
6
8
10
12
14
0
50
100
150
200
250
Series2
Series4
Series6
Temp (celsius) Time (sec)
3.
What are the two variables that you graphed?
Time – taken to dissolve.
Temp. – water 4.
Which is the independent variable? Should it be on the X- or Y-axis? Why?
The temperature of the water, on the X-axis. The temperature of the water is controlled.
5.
Which is the dependent variable? Should it be on the X- or Y-axis? Why?
The time it takes to dissolve the Alka-Seltzer tablet, on the Y axis. The time it takes to dissolve is determined by the temperature of the water.
6.
Predict how many seconds it will take to dissolve an Alka-Seltzer
®
tablet in
200 mL of water at the following temperatures. Use the exponential trend line to find the function used in predicting the time. If needed, please refer to the Introduction to Graphing manual for guidance.
a. 35°C
38 seconds b. 60°C
9 seconds c. 80°C
© 2016 Carolina Biological Supply Company
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
3
6 seconds Activity 2
7.
List five questions about the rate at which Alka-Seltzer
®
tablets dissolve if the temperature was held constant and one of the controlled variables was changed. a.
Will the Alka-Seltzer tablet dissolve faster in boiling water?
b.
What if I add salt to the water and then place the Alka-Seltzer pill
in it? How will this influence the dissolving time?
c.
How would the dissolve rate differ with 100 mL of water versus 200 mL?
d.
Would the results change if I constantly stirred the water as the tablet dissolved?
e.
What happens if I add food coloring to each cup?
8.
Develop a new hypothesis based on one of the questions. Remember that
a hypothesis must be testable with empirical or measurable data.
a.
If I add 1 tsp. salt to a cup at room temperature, the Alka-Seltzer tablet dissolves faster than the cup with ½ tsp. salt or the cup without salt.
Activity 2 Table
State the hypothesis.
If I add 1 tsp. salt to a cup at room temperature, the Alka-Seltzer tablet dissolves faster than the cup with ½ tsp. salt or the cup without salt.
Identify the independent variable.
The amount of water added to cups of salt.
Identify the dependent
variable.
The rate at which the tablet dissolves List the controlled variables.
Room temp water at 200 ml. water
How will the dependent variable be measured?
How long it takes for table to dissolve too nearest second. If the hypothesis is true, what results are The cup with the most salt added will make the Alka-Seltzer table dissolve faster than the others © 2016 Carolina Biological Supply Company
4
State the hypothesis.
If I add 1 tsp. salt to a cup at room temperature, the Alka-Seltzer tablet dissolves faster than the cup with ½ tsp. salt or the cup without salt.
expected?
© 2016 Carolina Biological Supply Company
5
Data Table 2 Run
No.
Manipulated
Variable
Time (sec.)
Observations
1
O Tsp
50
Clear water, some bubbles 1
½ Tsp. 55
Water looks hazy 1
1 Tsp.
61
Cloudy/fizzy water 2
0 Tsp.
94
Normal
2
½ Tsp.
108
Took more time to dissolves
2
1 Tsp.
138
Tablet mostly stayed at bottom
3
0 Tsp. 66
Normal
3
½ Tsp.
68
Fizzing at steady rate 3
1 Tsp.
82
Cannot see tablet in water well
Avg.
0 Tsp. 70
Avg.
½ Tsp. 77
Avg.
1 Tsp.
93.6
What could have been done in either activity to make the results more reproducible? Attempting to keep the water temps as close to the same as possible would allow for more accurate findings. Keeping the cold water at the same temperature prevents it from gaining heat from its surroundings, while keeping the hot water at the same temperature prevents it from cooling.
© 2016 Carolina Biological Supply Company
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help