Experimental Design
Describe an Independent Variable
Anything the scientist changes on purpose.
The variable the scientist is testing
What element is this? O
Oxygen
The smallest piece of any element is an _________.
Atom
What must happen before any 2 molecules can have a chemical reaction?
Collision
Describe a Dependent Variable
What the scientist measures
What element is this? Fe
Iron
Two or more atoms bonded together make up a ___________.
Molecule
Do all atomic/molecular collisions result in a chemical reaction?
No
Describe a Controlled Variable
All other aspects of an experiment that are not IV or DV
What is the common name of this molecule? H-O-H
Water
The chart that lists all the elements known to science is the ___________ __________.
Periodic Table
Will a softer collision or a harder collision be more likely to result in a chemical reaction?
Harder collision
How many variables is a scientist allowed to change on purpose in an experiment?
Only 1
What is the name of this molecule? C-O
Carbon monoxide
Anything that can make a chemical reaction happen faster is called a _________.
Catalyst
All iron structures will eventually rust in the open air. Name one thing that can speed up the rusting process.
Water, humidity, salt, snow, etc.
If a scientist changes more than one variable, what kind of unwanted variable is the result?
Confounding variable
How many hydrogen atoms are represented here?
3 CH4
12
The measurement of how fast (or slow) atoms or molecules move in a system is called ___________.
Temperature
What is the product of the reaction between
NO2 and O2 ?
O3 - Ozone