The simpler answer is Chemical, but the crystallising of the calcite is a Physical process..
Chemical change, sourness is due to formation of lactic acid
The thickening is caused by the formation of a precipitate. The formation of a precipitate is a chemical reaction.
Soap scum is a substance, not a change; but the formation of scum is a chemical process.
One distinguishing feature between physical and chemical changes is that a physical change can be reverse or turn back to its original form, but chemical change cannot be return to its form because the material change.
The formation of a salt is a chemical change. It is the result of the ionic bonding of a positive metal ion and a negative non-metal ion.
It is a physical change.
it is physical
Stalagmites are a physical change.
physical because doesn't matter if it forms its still a cave
it probably going to be a physical change because when the stalagmites form in the cave its still going to be a cave and nothing really is going to change the cave.
physical change
Chemical change
The formation of chemical bonds is a chemical change.
No. It is a chemical change.
Not really, it's more of evaporation. Rain water percolating through the earth laid over a limestone bedrock dissolves the limestone. The lime-water drips through cracks and forms caves. Evaporation of the drips leaves behind a tiny amount of limestone, that slowly forms the stalactites and stalagmites.
The formation of chemical bonds is a chemical change.
A chemical change