Give four examples illustrating each of the following terms. a. homogeneous mixture b. heterogeneous mixture c. compound e. physical change d. element f. chemical change

The fact that the total amount of energy in a system remains constant is a(n)

Which is an example of a highly unstable isotope that is often used in fission reactions?

Which of the following statements best explains why chemistry is testable a) it can measure data by experiments b) it cannot add new evidence c) it cannot be verified d) it is biased