on my homework sheet, it says construct balanced equations including state symbols. But here‘s my problem: they‘re in words! Can anyone help me??Hexafluorosilicic acid (H2SiF6) is formed with a gas with a lower density than air, when silicon reacts with hydrogen fluoride gas.Copper (II) oxide reacts with ammonia at 400 degreesC to form copper metal, nitrogen and another product, which is a gas under these conditionsSilver (I) nitrate solution is added to calcium chloride solution and a white precipitate is formed
Fe 2+ + S2- yields FeS Draw a clothing iron and an egg with stinky fumes coming from it for the sulfur.
starting with __ Si(s) + __ HF(g) --- __ H2SiF6(g) + __ ?? . . . ↑↑↑↑↑ . . this is the formed with a gas with density air piece ********* now. balancing the reaction 1 Si on the left 1 on the right 1 Si(s) + __ HF(g) --- 1 H2SiF6(g) + __ ?? then F's 6 on the right needs 6 on the left 1 Si(s) + 6 HF(g) --- 1 H2SiF6(g) + __ ?? and finally. the H's 1 Si(s) + 6 HF(g) --- 1 H2SiF6(g) + 2 H2(g) ******** H2(g) is less dense than air at the same P and T why? PV nRT n mass / mw subbing PV (mass / mw) RT rearranging (mass / V) mw x P / (RT) since density mass / V density mw x P/(RT) and therefore at the same P, R and T, the higher the mw, the higher the density mw of air 0.79 x 28 + 0.21 x 32 28.4 g/mole so we know the molar mass of the unknown gas 28.8 g/mol and H2 fits that limit. ******* likewise 3 CuO(s) + 2 NH3(g) -- 3 Cu(s) + 1 N2(g) + 3 H2O(g) and 2 AgNO3(aq) + 1 CaCl2(aq) -- 2 AgCl(s) + 1 Ca(NO3)2(aq)
Hexafluorosilicic acid (H2SiF6) is formed with a gas with a lower density than air, when silicon reacts with hydrogen fluoride gas. Ans: Si(g) + 6HF(g) ------ H2SiF6(aq) + 2H2(g) Copper (II) oxide reacts with ammonia at 400 degreesC to form copper metal, nitrogen and another product, which is a gas under these conditions Ans: 3CuO(s) + 2NH3(g) ----400oC---- 3Cu(s) + N2(g) + 3H2O(g) Silver (I) nitrate solution is added to calcium chloride solution and a white precipitate is formed Ans: 2AgNO3(aq) + CaCl2(aq) ---------- 2AgCl(s) + Ca(NO3)2(aq)
