Rock salt is a mixture of salt and sand. Describe how you would separate rock salt to obtain salt crystals and pure dry sand.

If you want to create an electrical current, which situation would produce a solution capable of this

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate