why is the reaction rep. by the following equation a redox reaction?
2Hg+O2->2HgO
what happens when the chemicals are put into a ice bath?
2NO2<---->N2O4+Energy
which of the following supports the converstion of mass?
MgO+H3PO4<---->Mg3(PO4)2+H2O
A) 3MgO+2H3PO4<---->Mg3(PO4)2+3H2O
B) 3MgO+2H3PO4<----->Mg3(PO4)2+2H2O
C) 6MgO+H3PO4<---->Mg3(PO4)2+3H2O
D) 6MgO+2H3PO4<--->2Mg3(PO4)2+6H2O
Which equation describes a synthesis reaction?
A) Ba(OH)2+2HCl<--->BaCl2+2H2O
B) Ba4+2O2<--->CO2+2H2O
C) Zn+CuSO4<--->Cu+ZnSO4
D) 2H2+O2<---->2H2O
2007-02-22 08:27:31 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
1) because
2Hg --> 2Hg+2 +4e-
O2 +4e- ---> 2O-2
add
2Hg + O2 --> 2HgO2
2) it will cool down
3) A
4) D
2007-02-22 08:36:09 · answer #1 · answered by Dr Dave P 7 · 0⤊ 0⤋
In a redox reaction, the oxidation states of at least two elements in the reaction will change. One will become more positive and the other will become more negative. In that reaction, Hg is oxidized to Hg2+ and O2 is reduced to 2 O2- ions.
Since energy is being released by that reaction, cooling it will remove the heat that is produced, and the equilibrium will shift farther to the right.
For this one, look for one that is balanced completely. That one will support the conservation of mass.
A synthesis reaction forms a compound from its elements. Only one of these equations does that.
2007-02-22 08:34:14 · answer #2 · answered by hcbiochem 7 · 0⤊ 0⤋
Read your chapter. Try these problems. If you are stuck on a particular issue, I would be glad to help.
2007-02-22 08:31:19 · answer #3 · answered by Roy E 4 · 0⤊ 0⤋