estions 16-23 below are true/false questions. In your scantron, select A for Tru
ID: 1043384 • Letter: E
Question
estions 16-23 below are true/false questions. In your scantron, select A for True, B for False 3 points each) 16. All soluble salts are strong electrolytes.T 17. Every time half-filled orbitals gets filled with electrons, ionization energy increases. 18. It is necessary to scour the magnesium strip with steel wool before you start an experiment. 19. Hood fans should be on while you are dissolving aluminium. 20. Electron-electron repulsion decreases as the number of electrons in an atom increases across a row in a periodic table. 21. Creating "Hot Spot" will help magnesium to convert into magnesium oxide faster. 22. The name of compound Mgs(POsh is magnesium diphosphate. T 23."Z" represents the number of the protons and neutrons in the atom. Bonus Question (6 points) 24. Calculate the theoretical yield of alum (KAlSO,) 12H,O) if 0.225 g aluminum was reacted with excess KOH and H2SOExplanation / Answer
16.TRUE
17.FALSE
18.TRUE
19.TRUE
20.T
21.F
22.T
23.F
24. This is my overall reaction:
2 Al(s) + 2 KOH(aq) + 4 H2SO4(aq) + 22 H2O(l) ? 2 KA1(SO4)2•12H2O(s) + 3 H2(g)
Mole Al used = mole Alum formed = 0.225 / 27 =8.33*10-3 (molar mass Al =27 and alum = 478 as per formula given in equation)
So Th. yield of alum = 8.33*10-3 x 478 = 3.9833 g
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