An example of a chemical change is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.
In chemistry, changes are classified into two: physical and chemical.
A physical change occurs when a substance or object changes its appearance, phase, or is used in a mixture. More importantly, a physical change does not change the molecular structure of a substance. These three are examples of physical changes in water, wherein the changes are on their phases only:
water freezing: liquid water becoming solid water
water boiling: solid water becoming gaseous water
water evaporating: liquid water becoming gaseous water
On the other hand, a chemical change takes place when the original substance's of molecules are taken apart and put back together into new combinations that are different from the original combinations. An example of this is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules, wherein a compound of water molecule is being break down into different molecules.
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No, but. It will seperate into two different layers based on density
Answer:
The correct option is 3. No, because atoms are not rearranged to create new substances.
Explanation:
A chemical reaction can be described as a reaction in which reactants combine to form new products. For example, the burning of wood is a chemical reaction.
A physical reaction can be described as the one in which no new products are made. The state of a substance might change from one form to another but no new substance is made. For example, the changing of the state of ice water into liquid water. A new product is not formed in this reaction hence, it is not a chemical reaction.