Question

1. choose the best answer. which statement is true about nitrogen gas, which is made of two elements of nitrogen chemically combined (n₂)? it is a compound. it is a molecule. it is a molecule and a compound. 16. choose the best answer. who proposed the law of multiple proportions? dalton thomson proust democritus

Explanation:

1. A compound is made of different elements chemically combined. Nitrogen gas ($N_2$) is made of only nitrogen - same element, so it is not a compound. A molecule is a group of two or more atoms held together by chemical bonds. Since $N_2$ has two nitrogen atoms bonded, it is a molecule.
2. John Dalton proposed the law of multiple proportions. It states that when two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in simple whole - number ratios.

Answer:

1. It is a molecule.
2. Dalton