Which of the following reactions is not a replacement reaction?
fe + cuso4 → feso4 + cu
2na + 2h2o → 2naoh + h2
zn + 2hcl → zncl2 + h2
2na + cl2 → 2nacl

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m