why does cobalt chloride strip turn pink or blue?
science - drwls, Thursday, March 29, 2012 at 8:46am
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.
science - laura, Thursday, March 29, 2012 at 1:18pm
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?