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| ammonia |
the gas with a strong smell that is formed by combining nitrogen and hydrogen. Ammonia is used to make refrigerators cold and in making fertilizers. [1/2 definitions] |
| carbohydrate |
a compound made of carbon, hydrogen, and oxygen. It is formed mainly by plants, and it is used in the body to easily produce and store energy. Sugars and starches are carbohydrates. [2 definitions] |
| carbon |
Carbon is one of the chemical elements found on Earth, and it is a very common element on this planet. It is also found all over the universe. Carbon atoms often combine with atoms of other elements, such as oxygen and hydrogen. Diamonds are an example of something made only of carbon atoms. [1/2 definitions] |
| chemical element |
any of the more than 100 substances, such as hydrogen, carbon, oxygen, and lead, that are made up of only one type of atom and which cannot be chemically separated into simpler substances. |
| fat |
a white or yellow oily substance found in some parts of animals or plants. Fat is made of carbon, hydrogen, and oxygen. [1/4 definitions] |
| H-bomb |
a very powerful bomb that releases energy by nuclear fusion. "H-bomb" is short for hydrogen bomb. |
| hydrogen |
a very light gas that burns easily and is one of the chemical elements. Hydrogen is the most abundant element in the universe. It combines with oxygen to make water, and it is found in all living things. Hydrogen combines with many substances and has many uses. (symbol: H) |
| hydrogen bomb |
a very powerful type of bomb. When its hydrogen atoms are forced together under great heat and pressure, they release energy in a huge explosion. |
| methane |
a gas made of carbon and hydrogen atoms that is stored in and collected from the earth. Methane is used for heating and cooking in the form of natural gas. |
| molecule |
A molecule is something made up of a single atom or a group of atoms. Atoms are tiny invisible things that make up everything in the world, and there are many different kinds of atoms. A molecule can have just one type of atom, or it can have atoms of different types. Water, for example, is a substance whose molecules are made up of two different types of atoms. One molecule of water contains two atoms of an element called hydrogen and one atom of an element called oxygen. This is the smallest amount of water that is possible, because, if you take away any one of these atoms, the molecule is not water anymore. If you change one of the atoms to something different or add more atoms, you don't have water anymore. If you want to create more water than this one molecule, you have to add at least one more molecule with exactly the right atoms. All water is made up of these same molecules. |
| neutron |
a small particle present in the nucleus of all atoms except the hydrogen atom. Neutrons have no electrical charge. The mass of a neutron is about equal to the mass of a proton. |
| nuclear |
of or having atomic or hydrogen bombs. [1/3 definitions] |
| oxygen |
a gas with no color or smell that is one of the chemical elements. Oxygen combines with hydrogen to make water. It also makes up about twenty percent of the earth's atmosphere. Most living things need oxygen. (symbol: O) |
| protein |
a substance that is made up of nitrogen, carbon, oxygen, hydrogen, and possibly other elements. Proteins are found in all living things and are a necessary part of life processes. |
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