Why do water pipes sometimes burst in winter? (Has to do with volume)

What are the percent by mass of copper in penny lab

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)