Both.
During decay it ceases to be radium.
Yes
Physical changes can be undone. It is not possible to unfry a chicken. The heat casues chemical changes in the meat and in any coating.
Magnesium is not a change of any sort. It is a metallic element that can undergo both physical an chemical changes.
Physical changeschemical changesYou must understand that matter can be in any one of three PHYSICAL states, liquid, solid or vapor ( a gas ).Changing physical states is not a chemical change, but a direct result of heat or cold application.
The physical changes do not belong to chemistry but there are two types of changes. The chemical changes and the physical changes. A chemical change it's to mix to liquids that will form a new product. Physical change is the change that changed somethings shape but not consistency.
Warming chocolate is a physical change because it changes the physical state of the chocolate from solid to liquid without forming any new substances.
Because any chemical changes occur.
It is a chemical changes, as is any sort of reaction.
Cooking an onion involves both chemical and physical changes. The heat causes physical changes such as softening and browning of the onion as well as chemical changes such as the breakdown of complex molecules into simpler compounds, resulting in new flavors and aromas.
no physical change is ptting ice cream and milk and mixing it for a milkshake or burning a piece of paper.
The hardness and density of zinc are physical properties, as they do not involve any change in the chemical composition of the substance. Changes in physical properties can be observed without altering the chemical identity of the material.
When heated, copper sulfate undergoes a reversible physical change where it loses its water molecules (dehydration) and changes color from blue to white. This process is purely physical and does not involve any chemical reactions.