1. Ammonia (NH4) is used for fertilizers and many other things. How many molecules of ammonia are present in 0.334 g ammonia? (Using conversion bet atoms, molecules and mass)

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Which of the following is most likely true about water in chemical solutions?

What energy is it when you flip on a switch on a lamp