In order to make a pot of water for boiling pasta, a small amount of salt is added to the water to mixture. After the addition of the salt, pasta is added to the pot. Using terms from Lesson 3, describe the mixture of salt in water and then describe the mixture of the pasta in the water. Explain how you know if each of these is homogeneous or heterogeneous. (Lesson 3)

Carbon-12 and carbon-14 are two isotopes of carbon. How are individual atoms of these two isotopes the same? How are they different? Another isotope of carbon is carbon-13. Why is carbon's atomic mass reported on the periodic table as 12.01 when this is not the mass of any of the isotopes? Be sure to use the terms discussed in Lesson 4 in your explanation. (Lesson 4)