Which of these reactions are redox reactions and why?
1: 6no + 4nh^3 > 5n^2 + 6h^2o
2: 2so^2 + o^2 > 2so^3
3: so^3 + h^2o > h^2so^4

Which statement justifies that phosphine (ph3) is a polar molecule?

Look at the reaction below: ca(hco3)2 --> caco3 + co2 + h2o first, balance the reaction. once balanced, use dimensional analysis or another method to find out how many moles of carbon dioxide will be produced if we start with 16.5 moles of calcium bicarbonate (calcium hydrogen carbonate). = mol of co2 number needs to be reported to three significant figures.

How does litmus paper indicate an acid?