Why do scientists believe that Thea was most likely the size of Mars?

Which of these is a physical property

The identities of substances are the same before and after which type of change

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state. a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car