1. Why is calcium fluoride, , a high-melting-point crystalline solid while stannic chloride, , is a volatile liquid? 2. Why can’t the elements of a compound be separated from one another by physical...

1. Why is calcium fluoride,
, a high-melting-point crystalline solid while stannic chloride,
, is a volatile liquid?

2. Why can’t the elements of a compound be separated from one another by physical means?

3. Classify the following as an element, compound, or mixture, and justify your classifications: salt, stainless steel, tap water, sugar, vanilla extract, butter, maple syrup, aluminum, ice, milk, cherry-flavored cough drops.