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This semester we've done a section on compounds. I have learned that compounds are pure substances made up of two or more elements, combined in a definite proportion. Compounds can be made up of any kind of element. Some examples are hydrogen peroxide or carbon dioxide. Another is water, or H2O  Another example of a compound is marsh gas, or CH4  As you know, compounds are chemical combinations of elements. Element atoms combine to form compounds. Here are some examples of elements:  |