chemistry extra credit! full time working mom need help!?

Question

1: When sulfur dioxide decolorizes KMnO4, a product is MnS04. The valence of manganese changed from
+7 to +2
+6 to +4
+5 to +2
+4 to +2


2: The valence of Ti in TiO2 is
1
2
3
4


3: The formula for ferric sulfate is
FeSO4
Fe2SO4
Fe2(SO4)2
Fe2(SO4)3


4: One molecule of hydrogen is represented by the expression
H2
2H
2H+
2H-


5: The formula for nitrogen pentoxide is
NO2
N2O
N2O3
N2O5


6: The formula of sodium sulfite is
Na2S
Na2SO2
Na2SO3
Na2SO4


7: If the valence of element X is +2 and the valence of element Y is -3, the formula of the product when combined is
XY
X2Y3
X3Y2
X6Y6


8: The valence of sulfur in H2SO4 is
-6
-3
6
8


9: The formula for potassium sulfide is
K2S
KHSO3
K2SO3
K2SO4


10: The symbol for the element copper is
Co
C
Cr
Cu


11: The formula that shows chlorine with a valence of 7 is
HCl
HClO2
HClO3
HClO4


12: In K2CrO4, the valence number of Cr is
6
2
8
4


13: The symbol for lead is
P
Pb
Po
Pt


14: The symbol for silicon is
S
Sc
Si
Sn


15: The valence of the phosphorus in Na3PO4 is
-1
2
-3
5


16: The valence of aluminum is +3. The formula of aluminum sulfate is
Al2S3
AlSO4
Al2(SO4)3
Al2SO4


17: The number of electrons lost or gained in the outermost orbit of an atom is the atom's
atomic weight
atomic number
valence
molecular weight


18: The only common radical which has a positive valence is
SO4
NO3
NH4
CrO4


19: In the compound KClO3 the total negative valence is
-2
-4
-3
-6


20: What is the symbol for the element aluminum?
Ag
At
Al
Ar

Answer 1

1. Sulfuric acid (H2SO4) can be thought of as 2 H+ and 1 SO4=. That may help you with both 'Mn' and 'O4'. Oh, yes - K is K+.
2. each O has 2 'bond pieces' that can either be 2 single bonds or 1 double bond.
3. Ferric vs. Ferrous
4. _One_ molecule.
5. nitrogen _pent_oxide.
6. sulfite or sulfate or sulfide?
7. least common denominator
8. see 1.
9. see 6.
10. I periodically table the motion.
11. hint: H+
12. hint: K+
13. Latin for 'lead' is 'plumbum', from which we get 'plumbing'
14. Sulfur and Scandium and Tin, oh my!
15. Na+(2) SO4=
16. H+(2) SO4=
17. what are all these questions about?
18. Ammonium sulfate
19. should be workable by now.
20. silver and astatine both are gone!

Answer 2

1] +7 to +2
2] 4
3] Fe2(SO4)3 -ic is the more heavily oxidized, -ous the less
4] H2
5]
6] Na2SO3 -ite is the less oxidized, -ate the more oxidized
7] X3Y2 the Xs give up 6 electrons, which the Ys snap up
8] 6 the oxygens grab 8 electrons, the hydrogens provide 2, so the sulfur has to provide 6
9] K2S
10] Cu from the latin Cuprum
11] HClO4 perchloric acid, very unstable as Cl wants to be -1 not +7 it is prone to sudden detonation
12] 6 oxygens grab 8 electrons, Ks provide 2, so Cr has to give up 6
13] Pb from latin plumbum; plumbers used to use lead pipe; a plumb bob used to be a lead weight
14] Si
15] 5; Oxygens grab 8 electrons, Nas provide 3, so P gives up 5
16] Al2(SO4)3
17] valence
18] not sure... NH4+ is an ion, not a radical
19] -6; the 3 oxygens are at -2 [chlorine at +5 which it hates]
20] Al

Answer 3

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