A/a physical change is when an object goes through a natural change such as weather etc.
B/ the different is that 1) chemical change is more quick to change rather than physical (ex: I’d there is rocks flying around and is wearing down another rock it would take longer rather than acid)
It depends if your talking about science or math but It could be both if it says something about weathering which is what causes a rock to break it might be chemical ill comment and tell you the correct answer
Answer:
The outer shell
Explanation:
I am not completely sure what you are looking for but an atom's valence electrons are the outer shell in a Bohr model.
Answer:
pressure of gas are constant describe the relationship between moles and temprature
