No, the rusting of iron is a chemical change because it is two substances reacting together to make a new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide. Rusting would only be a physical change if iron molecules remained pure iron throughout the process.Continue Reading
The rusting of iron is an illustration of the principle of corrosion. Corrosion is a chemical change that usually occurs in metals that come into contact with an electrolyte. Water is the electrolyte that most commonly enables oxygen and iron to combine. This is why iron rusts when exposed to both water and air. Covering iron with a coat of paint or zinc is an effective way of deterring rust because it prevents the pure iron from coming into contact with air.
There are several processes iron can undergo that are physical changes. Melting and any other change of state is a physical change, as well as magnetising or demagnetising. In addition to that, any change of volume or mass is a physical change. The forming of iron into steel is also a physical change, as the individual molecules of iron are not changed in this process.Learn more about Chemistry
One example of a chemical change is the rusting of iron. An additional example is the digestion of food by the body. A chemical change is an irreversible change that involves reactants and the creation of new products.Full Answer >
Chemical change is a change in a substance that transforms it into a different substance. Chemical change is distinct from physical change, which is a change in the physical features of an object without a corresponding change in substance. Heat, combustion and mixture of chemicals can all cause chemical changes.Full Answer >
A phase change in science refers to any substance that changes from one state to another, with possible states being gas, liquid and solid. Substances typically phase change to the closest related state, such as liquid to solid, but in certain conditions can go from gas to solid or solid to gas.Full Answer >
In chemistry, an indicator is defined as a substance that undergoes distinct observable change when the conditions of its solution change. Litmus is the most commonly used indicator in the laboratory.Full Answer >