Equation:
H2CrO4 + H2O <=> H3O+ + HCrO4- <=> H3O+ + CrO42-
Aluminium hydroxide could be formed
The absorption of water is not a chemical reaction.
You may be speaking of hydrolysis, in which a macromolecule is broken down into smaller molecules by the addition of water. Refer to the related links for an illustration.
This chemical reaction is called dehydration.
This mixing is not a chemical reaction.
chromic acid + sodium carbonate -> sodium chromate + water + Carbon Dioxide
Hydrolysis is a chemical reaction. Molecules of water are split into hydrogen cations and hydroxide anions in the process of a chemical mechanism.
Aluminium hydroxide could be formed
There is no chemical change at all. Adding salt to water makes salty water.
Because the concentrations of solutes are lowered.
If the water being added is pure, and the solvent in the copper sulfate solution was water, then no, this should not result in a chemical reaction. The visual change is due to dilution of the solute
This is a neutralization reaction. This reaction should result in producing a salt and water. Sodium chromate is the salt in this instance.
The absorption of water is not a chemical reaction.
Sodium fizzes in water because it is undergoing a chemical reaction with water to form sodium hydroxide. The result is more stable than either of the original chemicals. When sodium chloride is added to water both of these substances are stable with respect to each other and no reaction occurs that results in a new chemical product.
Exothermic reaction.
Water is not a reaction at all. If you mean to ask if a state change in water is chemical or physical, it is physical.
Not a chemical reaction, but the formation of a water solution of hydrofluoric acid.