Law & Theory
Parts of an Experiment 1
Phys/Chem/Density
Variables
Chemistry
100
What is an educated guess that can be tested through experiments and observations?
A hypothesis
100
This states what you think will happen by relating the variables in an experiment.
Hypothesis
100
What changes the appearance of a substance, but DOES NOT change what the substance is?
Physical Change
100
In an experiment, what does NOT receive the independent variable?
Control
100
A chemical reaction in which heat energy is released, making the reaction warmer.
Exothermic Reaction
200
What is a scientific explanation which has been proven true by many tests and experiments?
Theory
200
What is a universally accepted scientific FACT, which cannot be changed?
Scientific Law
200
When a reaction occurs and makes a new substance.
Chemical Change
200
What do YOU control in an experiment?
Independent Variable
200
A chemical reaction in which heat energy is absorbs, making the reaction cooler.
Endothermic Reaction
300
Once a theory has been accepted universally, it becomes a _________.
Scientific Law
300
In an experiment, the sample that is not being tested on, is not getting the independent variable.
Control Group
300
What is the mass and volume of a substance/object?
Density
300
What is being affected, or measured in an experiment?
Dependent Variable
300
Acids have a pH between ______ and _______.
0 and 6
400
What is replication?
Repeating an experiment many times to verify the results.
400
What are the results of your experiment based on the data or results?
Conclusion
400
How do you know a chemical change has occurred?
If there is fizzing, bubbling, fire, baking, color change, sound released, light released, change in temperature, etc.
400
The number of items you are testing in the experiment.
Sample Size
400
Neutrals have a pH level of ______.
7
500
What does the law of conservation of matter state?
Matter cannot be created or destroyed, its only changed.
500
When considering the sample size, the _______ information and data the better!!
MORE
500
In a density column, liquids and objects with higher densities go _______________ liquids and objects with lower densities.
BELOW
500
When conducting an experiment, how many variables should be changed?
In order to have an accurate experiment, you should change only 1 variable during an experiment.
500
What changes color when mixed with a substance to tell you the pH?
pH indicators
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