1. Calcium fluoride (fluorspar or fluorite) is a partially

soluble ionic compound used in metallurgy, particularly

in aluminum and steel production. When placed in

water, the solid is in equilibrium with its ions.

a. Write a balanced equation to show this

equilibrium.

b. What happens to the position of equilibrium if

soluble calcium chloride is added to the solution

of calcium fluoride?

C. What will happen to the equilibrium concentration

of F- when calcium chloride is added?

c is the answer because when something is left after something evaporates that shows the chemical change.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.