Answer: Compound
When two or more elements chemically combine what do they form?

Law of multiple proportions - Wikipedia

Chemical compound - Wikipedia

Combination reaction - Wikipedia

The combination of two or more elements to form one compound is called combination reaction. | a)- Between elements | C + O 2 → CO 2 | Carbon completely burnt in oxygen yields carbon dioxide |- | b) Between compounds | CaO + H 2 O → Ca(OH) 2 | Calcium oxide (lime) combined with water gives calcium hydroxide (slaked lime) |- | c) Between elements and compounds | 2CO + O 2 → 2CO 2 | …

In chemistry the law of multiple proportions states that if two elements form more than one compound between them then the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers. This law is sometimes called Dalton's Law named after John Dalton the...


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