What happens when elements are chemically combined?

Atoms of different elements can join together in chemical reactions to form compounds. For example hydrogen and oxygen are elements. They react together to form water, a compound

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Depends on the elements... Certain type of chemicals combined can be very dangerous and have a big impact like blowing up, or fizzing But typically they form a new element. Some elements counteract other elements.

Hno3(aq) → h+(aq) + no3−(aq). picture ii best represents the strong acid hno3. strong acids are strong electrolytes