2KHCO3(s) K2CO3(s) + CO2(g) + H2O(l) How many moles of potassium carbonate will be produced if 476 g of potassium hydrogen carbonate are heated? A)4.76 b)3.44 c)238 d)2.38 e)12.6 Explain how you got your answer.

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes or no?

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.