Henry mixed salt and water together in a cup until he observed a clear solution. he measured the mass of the solution. then he placed the cup outside for several sunny days during the summer. after a week, he observed that only solid salt remained in the cup and the mass had decreased. henry concluded that a physical and chemical change occurred in this investigation. which statements correctly defend or dispute his conclusion? 1. he is correct dissolving salt in water is a physical change, but evaporating the water is a chemical change. formation of a solid is evidence that a chemical change occurred. 2. he is correct evaporation is a physical change, but dissolving salt in water is a chemical change. the change in mass is evidence that a chemical change occurred. 3. he is incorrect dissolving salt in water and evaporation of the water are both physical changes. the reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change. 4. he is incorrect dissolving salt in water and evaporation of the water are both chemical changes. the reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.

3. He is incorrect Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.

Explanation:

Henry did a little experiment and noted that the sun can be completely diluted with water. That is, salt has a strong solubility. Solubility is a change in physical magnitude that is related to the ability of a solute, in this case salt, to establish covalent bonds with the molecules of a solvent, in this case water, which can be completely dissolved.

After that Henry was able to observe that if he left the water and salt solution in the sun, all the water would be evaporated. Evaporation is also a change in physical magnitude and refers to the ability of a liquid to transform into a gaseous body after being hit by an amount of thermal energy.

When the water is evaporated, the diluted sun reappears. This is because solubility is a reversible reaction. This type of reaction allows the reagents to become products and the products can also become the reagents that will originate them.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.