Learning target:
Level 3 on learning scale
I will be able to conduct an experiment with all its parts:
generate a hypoThEsiS, Identify variables, collect data, analyze data,
generates a conclusion.
When writing a hypoThEsiS
what needs to be included to
assure it is complete?
CW#3 Experiment
Does Temperature affect the Dissolving time
of an effervescent tablet?
Some over-the-counter drugs are effervescent tablets that must be dissolved in water before
ingestion. Directions do not include specific water temperatures.
Hypothesis:
A hypothesis is defined as a testable idea, a tentative explanation. Formulate your own
hypothesis stating whether or not you think the temperature of water and the dissolving time
of effervescent tablets are related. Begin your hypothesis with “I believe that…., because.”
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________
Inquiry Question(Problem):
Conceptual (Knowing)
Methodological (Doing)
Word List:
Evidence:
Independent Variable:
Procedure:
Dependent Variable:
Control of Variables:
Constant(s):
Hypothesis:
Conclusion:
Data (in table, chart, or graph form):
Read procedure and collect data
Materials:
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3 Alka-Seltzer
Cold , Hot and Room temperature water
Thermometer
3 Styrofoam cups
Markers
Timer
SAFETY CONCERNS:
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•
Wear Goggles all the time.
Handle with care the hot water.
No running or horseplay in class
Wear a mitten to transfer the hot water into the Styrofoam cup
If glassware breaks or a spill happens, notify teacher immediately. Do not touch broken glass.
Unplug the kettle after the lab is done.
The variables are:
Test- Independent Variable (TIV) ,
Outcome- Dependent Variable (ODV)
Definitions:
Test- Independent Variable (TIV) - is what you’re testing, It is what did you change on purpose:
___________________________________________________
Outcome- Dependent Variable (ODV)- What changes/what you measure as a result of your Test- Independent Variable.
____________________________________________________
a. Control (the group that has nothing changed, point of reference, used for comparison):
____________________________________________________
a. Constants ( controlled conditions , what remains the same—avoiding to affect the 2 variables TIV and ODV in your
experiment , you should list as many as you can think of):
_________________________
_________________________
_________________________
__________________________
_________________________
PROCEDURE: You will be working on your table.
1. Supply Master gathers the materials for the table to start the lab. Always look for the prepared basket
that match with the color of your table.
2. Procedure Specialist read aloud the procedure steps and the table start the lab by doing the following steps: Make
turns for everybody to participate in the hands on activity.
a. Place one Effervescent tablet in a Styrofoam cup containing 75 ml of cold water.
b. Record the amount of time, in seconds (s), it takes the tablet to completely dissolve.
c. Repeat steps 1 & 2 with 75 mL of hot water. Record data on table 1.
d. Repeat steps 1 & 2 with 75 mL of room temperature water. Record data on table 1.
e. The Team manager check everyone stay on task & understand the lab plus will come to the teacher
laptop connected to the Smart board and type the time data for each temperature for others to be able to
complete their Data Table 1 and calculate the mean(average time).
f. While Recycling engineer is cleaning areas and returning materials to the teacher gathering materials
table.
6. Calculate the mean (average time) of the tablet to dissolve at the different temperatures.
Average(mean)= DT1 + DT2+DT3+DT4+DT5+ DT6 -> # of trials
6 -> This number depends on the tables number in the period
Figure 1. Data Table
Temperature of
Water in Celsius
degrees ( °C)
Time to dissolve in seconds (s)
Trials ( different Team data)
1
ables and graphs.
_____ Cold
_____ Room
_____ Hot
Average time to dissolve in seconds (s)
2
3
4
5
6
Y
Figure 2: Bar graph
Remember DRY MIX
x
Conclusion
1.You must answer the experiment question. 2.
Support it with evidence(data).
Must write All the data not part of it, and
Not an opinion.
Example:
I conclude that as the volume of water increases the
height of the plant increases as well. As you can
observe in the data table when you add 5,10,15, 20
mL of water the height increased from 20 to 30 to 35
to 42 cm.
Conclusion:
A conclusion is the place that you revisit your hypothesis to determine if the scientific investigation supported or did not
support your hypothesis. In other words to answer the experiment problem using the data that you got.
Was your hypothesis supported or not supported? Why? Show evidence (data from the experiment).
Use R.A.P. to write a valid conclusion. Make sure it’s a paragraph and not bullet points.
We conclude that the Water Temperature in Celsius degrees ( °C) and Dissolving time in
seconds (s) are…______________________________(related, not related). As you can
observe in our data table the Water temperature in Celsius degrees ( °C)
was________________ (increasing, decreasing, or staying the same)
from _______ , ______, _______ , and the dissolving time was _____________(increasing,
decreasing, or staying the same) from _______, _______,_________.
My hypothesis was _________________ (supported or not supported) by
____________________________________________________________________________
______.
From where do scientists begin an investigation or
experiment?
They start with a question, a problem from
observations that had been made.