Asolution in a dish contains 4.0 grams of salt dissolved in 100 grams of water. if 50 grams of the water evaporate, this is evidence that the solution is a compound conserving mass an element a mixture

a mixture

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions or physical reactions.Example: Copper

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. It can be decomposed into simpler constituents using physical means. Example: Air

2b2t

explanation:

2b2t