3. Which of the following items is representative of a homogeneous mixture?
2 points
A. spaghetti & meatballs
B. cheeseburger
C. white bread dough
D. smoothie
E. Both A and B
O F. Both C and D
4. Which of the following is a chemical property of matter?

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes? or no? this question is worth 20 points! let it be correct!