Scientific Method
After you have thought about the purpose of the experiment, you will make an educated guess about what will happen.
Hypothesis
An aspect of an experiment that changes during the course of the experiment
Experimental variable
a simple way of recording and counting frequencies. Each occurrence is shown by a mark and every fifth mark is drawn diagonally to make a “gate” of five
Tally Chart
When is the experimental variable good
An experimental variable is good when you are using it to learn something from the experiment
Name the control from the egg, salt, water lab
when the egg was put in the jar of water without salt
In sentence form, describe the purpose of the experiment. What question are we trying to answer with this experiment?
Objective
The variable or part of the experiment to which all others will be compared
Control (of an experiment)
a diagram in which the numerical values of variables are represented by the height or length of lines or rectangles of equal width
Bar Graph
When is the experimental variable bad
when it effects the results of the experiment.
Name the control from the candle/jar lab
lighting the candle and watching it first
This should be a few sentences that explains what your data shows. You only report on the data you obtained, not on what you think should have happened
Results
Experiments in which the participants do not know whether or not they are a part of the control group
Blind Experiments
is used to display two sets of data on the same graph.
Double Bar Graph
Why would an experimental variable be eliminated?
It should be reduced or eliminated when it effects the results of the experiment.
Why did the candle burn out when a jar was placed over it?
The burning of the candle used up all the oxygen in the jar. Without oxygen combustion doesn't happen
Record what happened during the experiment. You can include numerical data, observations using your senses, pictures, etc. If necessary, you can create a table or graph
Data and Observations
Experiments in which neither the participants nor the people analyzing the results know who is in the control group
Double Blind experiments
is a graph that uses lines to connect individual data points.
Line Graph
Name the experimental variable in the egg, water, salt lab
amount of salt
When did the candle burn the longest? When placed under a small glass or a large glass.
Large glass
Write a good paragraph or two explaining why you think you got the results that you did. Was your hypothesis correct? What did you learn during this experiment?
Discussion and Conclusion
the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules
Surface Tension
a type of graph in which a circle is divided into sectors that each represent a proportion of the whole
Pie/Circle Graph
Name the experimental variable in the candle jar demonstration from class
size of jar
In the demonstration with the colored water and candle, why was water sucked up into the glass after it burnt out?
When the oxygen is used up, a void is left in the jar that becomes filled with water