Types of Matter and Changes in Matter
What is Chemistry?
Chemistry is a basic science whose central concerns are the structure and behavior of atoms and elements. Chemistry is also the study of the composition and properties of compounds and the reactions between substances with their accompanying energy exchange and the laws that unite these phenomena into a comprehensive system. Chemistry is not an isolated discipline, for it merges into physics and biology.
Video / Elemental Funkiness
Periodic Table of Elements Song "Elemental Funkiness" by Mark Rosengarten
As you probably saw, the periodic table is organized like a big grid. The elements are placed in specific places because of the way they look and act. If you have ever looked at a grid, you know that there are rows (left to right) and columns (up and down). The periodic table has rows and columns, too, and they each mean something different.
Video / Balancing Chemical Equations
Balancing Chemical Equations by the Khan Academy
PhET Interactive Simulation Balancing Chemical Equations
How do you know if a chemical equation is balanced? What can you change to balance an equation? Play a game to test your ideas!
Video / The SciShow / Episode: The Periodic Table
Elements are the building blocks of all matter. We talked about quarks in the atoms section. They are smaller than the atoms of an element, but only when they group with other quarks do they form atoms that have recognizable traits. Some quarks combine to make an oxygen (O) atom. Other quarks can combine to form a nitrogen (N) atom. It's the atoms that are different and unique, even though they are made of the same pieces.
Video / The SciShow / Episode: Elements
Atoms are the building blocks and basis of chemistry. They are the basis for everything in the Universe. You should start by remembering that matter is composed of atoms. Atoms and the study of atoms are a world unto themselves. We're going to cover basics like atomic structure and bonding between atoms. As you learn more, you can move to the biochemistry tutorials and see how atoms form compounds that help the biological world survive.
PhET Interactive Simulation Build an Atom
Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!
Video / EcoGeeks / Episode: Chemistry of the Water Cycle
Video / EcoGeeks / Episode: Cooking with Chemistry
Density is a measure of how tightly matter is packed in an object.
PhET Interactive Simulation Density
Why do objects like wood float in water? Does it depend on size? Create a custom object to explore the effects of mass and volume on density. Can you discover the relationship? Use the scale to measure the mass of an object, then hold the object under water to measure its volume. Can you identify all the mystery objects?
Video / EcoGeeks / Episode: History of Chemistry
Chemical ReactionsLet's start with the idea of a reaction. In chemistry, a reaction happens when two or more molecules interact and something happens. That's it. What molecules are they? How do they interact? What happens? Those are all the possibilities in reactions. The possibilities are infinite. There are a few key points you should know about chemical
A Chemical Reaction Demonstration
A Chemical Reaction Demonstration
Video / Joe Genius / Episode 1: Chemistry Cafe
From elephant toothpaste to overly effective rocket fuel to good-old explosions, this episode is all about chemistry—the science of atoms and molecules at play.
Matter is everything around you. Matter is anything made of atoms and molecules. Matter is anything that has a mass. Matter is also related to light and electromagnetic radiation. Even though matter can be found all over the universe, you usually find it in just a few forms. As of 1995, scientists have identified five states of matter. They may discover one more by the time you get old.