50 points

how many copies of so2 are required to balance this chemical equation?
__so2 + 2li2se sse2 + 2li2o
a. 0
b. 1
c. 2
d. 3

which is the balanced chemical equation representing the decomposition of red solid mercury (ii) oxide?
hgo hg + o2
a. hgo hg + o2
b. 2hgo hg + 2o2
c. 2hgo 2hg + o2
d. 2hgo 2hg + 2o2

which of the following chemical equations is balanced?
a. h2 + cl2 4hcl
b. 4h2 + 2o2 2h2o
c. 4fe + 3o2 2fe2o3
d. 2fe + hcl fecl2 + h2

which coefficient before sodium bromide (nabr) balances this chemical equation?
2naf + br2 __nabr + f2
a. 2
b. 3
c. 4
d. 5

which coefficient before hydrogen (h2) balances this chemical equation?
n2 + __h2 2nh3
a. 2
b. 3
c. 4
d. 5
which of the following chemical equations is balanced?
a. p4 + o2 p2o3
b. cf4 + br2 cbr4 + f2
c. mgf2 + li2co3 mgco3 + 2lif
d. na3po4 + koh naoh + k3po4

which is the balanced chemical equation representing the reaction between barium sulfide and platinum fluoride?
bas + ptf2 baf2 + pts
a. bas + ptf2 baf2 + pts
b. bas + 2ptf2 baf2 + 2pts
c. 2bas + ptf2 2baf2 + pts
d. 2bas + ptf2 2baf2 + 2pts

exit
how many copies of f2 are required to balance this chemical equation?
n2 + __f2 2nf3
a. 3
b. 4
c. 5
d. 6

how many copies of h2o are required to balance this chemical equation?
ch4 + 2o2 co2 + __h2o
a. 1
b. 2
c. 3
d. 4