What evidence can be used to to determine if the change is a physical change

choose all that apply

the solid dissolved
the solid formed bubbles
the solid changed colors
the combination produced heat

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

What is the oxidation state of each individual carbon atom in c2o42−?

Which of the following has expanded our knowledge of the universe beyond our solar system the most? a. manned space travel b. the hubble space telescope c. the pioneer and voyager missions d. the international space station