O Chem Lab copy 3

The picture below is a representation of H(g) and O(g) in a sealed container Ona • Hag 2H2(g) + O,(g) → 2H,O(g) Which of the following pictures would best describe the products of the following reaction O A O B O D O E 00

One way to analyze for the amount of phosphorus in a rock is to precipitate the phosphorus as MgNH PO4, which is then heated to tum it into Mg,P2O7. What mass of Mg2P207 will be obtained from a 2.102 g sample of a rock that contains 86.52% Ca3(PO4)2 (and no other source of phosphorus) if this analysis is done? Hint: you will not be able to write an equation for this problem. Please do not include units in your answer. MAR MacBook Air 2.

9. Homework • Unanswered HCl(ag) +_N22CO3(aq) → Identify the spectator ions. NaCl(ag) + _CO2(8) + _H2O(1) Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. Nat andH+ a b Nat and CO Natand Cl- d co?-and Cl-

Balance the chemicalequation _Zn (s) + _ HCl (aq)------> _ZnCl2 (aq) + _ H2 (g) identify the chemical reaction  _BaCl2(aq) +_Na2SO4(aq)----->_BaSO4 (s) + _NaCl (aq) identify the chemical reaction

Precipitates used in the gravimetric determination of uranium include NazU2O7 (MM = 634.0 g/mol), (UO2),P,O7 (MM = 714.0 g/mol), and V2O5•2UO; (MM = 753.9 g/ mol). Which of these weighing forms provides the greatest mass of precipitate from a given quantity of uranium?