Decomposition of any compound e.g. when heated CaCO3 compound decomposes to CaO and CO2 compounds, gives different substances and hence a chemical change. Y.Ozkalay
Chemical, because it changes the identity of the substance.
burning in presence or absence of oxygen is a chemical change.
Both. The chemical change is H2CO3 decomposing into H2O and CO2. The physical change is the dissolved CO2 forming a bubble and "fizzing" up to the surface.
Chemical
A physical property is part of the make up of something that has a physical mass. No decomposing is not a physical property but rather both a physical change and a chemical change hence changing the chemical properties . The physical change is when the mass changes due to the brake down of the chemical and physical properties.
Exploding of potassium metal when placed in water
it is a chemical change
Decomposing of a chemical compound is a chemical change. But decantation, filtration, centrifugation are physical processes.
This reaction is a chemical process.
Chemical change; bonds are broken when water decomposes into hydrogen and oxygen.
burning in presence or absence of oxygen is a chemical change.
Both. The chemical change is H2CO3 decomposing into H2O and CO2. The physical change is the dissolved CO2 forming a bubble and "fizzing" up to the surface.
Chemical
A physical property is part of the make up of something that has a physical mass. No decomposing is not a physical property but rather both a physical change and a chemical change hence changing the chemical properties . The physical change is when the mass changes due to the brake down of the chemical and physical properties.
This is a chemical process.
Exploding of potassium metal when placed in water
in fact all are chemical changes.
It depends on how much heat is added; for instance: Chemical change indicates a change in the chemical formula. Heating it would eventually decompose it, so it is a chemical change if you are decomposing it. A change in phase (solid-->gas) would be a physical change, so as long as the chemical formula stays the same, meaning it doesn't react with anything in the air or decompose, it would be a physical change