How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
Introduction to Chemistry
The study of matter and the changes that it undergoes.
Anything that has mass and takes up space.
A measure of the amount of matter.
A measure of an amount of matter and also the effect of Earth's gravitational pull on that matter.
A systematic approach used in scientific study that typically includes observation, a hypothesis, experiments, data analysis, and a conclusion.
Information describing color, odor, shape, or some other physical characteristic.
Numerical information describing how much, how little, how big, how tall, how fast, etc.
A tentative, testable statement of prediction about what has been observed.
A set of controlled observations that test the hypothesis.
In an experiment, the variable that the experiment plans to change.
In an experiment, the variable whose value depends on the independent variable.
In an experiment, the standard that is used for comparison.
A judgment based on the information obtained.
A visual, verbal, and/or mathematical explanation of data collected from many experiments.
An explanation supported by many experiments; is still subject to new experimental data, can be modified, and is considered successful it if can be used to make predictions that are true.
Describes a relationship in nature that is supported by many experiments.
A type of scientific investigation that seeks to gain knowledge for the sake of knowledge itself.
A type of scientific investigation that is undertaken to solve a specific problem.
The practical use of scientific information.