Asked by kayla

why does cobalt chloride strip turn pink or blue?
Answered by drwls
It indicates the amount of water present in the sample, by going back and forth between a hydrated and anhydrous form. Each has a different color.

http://en.wikipedia.org/wiki/Cobalt(II)_chloride
Answered by laura

1. Two dogs are fighting over a 0.5 kg bone. The larger dog pulls on the bone in one direction with a force of 40 N. The smaller dog pulls in the opposite direction with a force of 36 N. What is the net force on the bone?
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