Dissolving salt in water is an example of a chemical change. The dissolution leads the salt to break into sodium and chlorine ions, so it alters its essential chemical properties. Even though boiling salt water ends up leaving behind a residue of salt, while the salt and water are together, the chemical processes change enough to be viewed as a chemical reaction.Know More
Salt is formed out of the ionically bonded elements of sodium and chlorine; the fact that water molecules are polar, with a slightly positive charge on one end and a slightly negative charge on the other means that water has the power to break some of these ionic bonds. The polarity in the salt molecules mirrors that of the water molecules, making it even easier for the water to break up the salt molecules, causing the salt to dissolve.
The process of breaking up the salt molecules involves the matching of opposite magnetic poles. The hydrogen end of the water molecule takes on a slightly positive charge, attracting the slightly negative chloride end of the salt molecule. This attraction also takes place between the slightly positive sodium end of the salt molecule and the slightly negative oxygen end of the water molecule.Learn more about Chemistry
There are a few telltale signs that can help indicate that a chemical reaction has taken place; these include the creation of one or more new substances and a noticeable energy change from the reaction site. However, telling whether a chemical reaction has actually taken place is not always very easy to observe.Full Answer >
Chemical reactions occur when two molecules collide with each other in a certain orientation and amount of force, which causes a chemical change due to the breaking and forming of the bonds between the atoms. Bonds are broken and formed due to the movement and sharing of electrons between atoms without any change to the nuclei.Full Answer >
The formation of rust represents a chemical change. When a chemical change occurs, the substance or substances present at the beginning are no longer present at the end of the change. Once a chemical change occurs, it theoretically cannot be undone.Full Answer >
Because the process during digestion causes food to become a new substance, digestion is a chemical change. A physical change occurs when a subject changes its shape, size or state.Full Answer >