1)Classify each of the following as a pure substance or a mixture,if it is a mixture, state whether it is heterogeneous or homogeneous: (a)concrete,(b) tomato juice,(c)marble,(d)seawater, and (e)iron? 2

1)Classify each of the following as a pure substance or a mixture,if it is a mixture, state whether it is heterogeneous or homogeneous: (a)concrete,(b) tomato juice,(c)marble,(d)seawater, and (e)iron?

2.what distinguishes a mixture from an impure subastance?

3.Define the process of sublimation?

5.How do decantation and filtration differ?which should be faster?

6. why should you never place a hot object on the pan of a balance?

7. A student found that her mixture was 13% NH4CL, 18%NACL, and 75% sio2. Assuming that her calculations are correct, what did she most likely do incorrectly in her experiment?