Document 238770
' 1l What is a Chemical Equation? Homework
1) Balance the following equations/reactions by placing small whole-number coefficients in front of the
formulas, You may NOT change the formula of a compound. A number one (1) doec not need to be written,
but ig helpful to do, when balancing.
Reactlon (flll ln the coelficients)
Sum
ol
Coefilcients
Hr (q)
C(s) +
CHr
)
)
NaoCO. (ao)
Cu (s)
+
HrO (l
)
)
HCl(ao)
)
O" (o) )
)
C(o)+
O, (o)
)
+
CO, (o)
H"O (o\
NH" (o)
Oo (o)
CO, (o)
C(s))
Ca(OHL (ao) +
H,O (l)
O, (o)
Al(s)+
CuO (s) +
2) What does the
CO" (o\ +
H,O (l) +
)
+
N"O. (o)
)
H" (o)
N" (o) +
NaCl (ao)
HCI(q)
)
O" (c\
CH, (o\ +
Cu(NOs)z (aq)
Aq (s) +
Cb (o)
+
N, (o) +
AlrO.
lz (s)
C(s)+
AqNO" (aq) +
H"O" fi)
FerOe
Na (s) +
C"H,'rO" (s)
H, (o)
)
O, (o)
Fe (s) +
Nal(s)
)
HCI(ao)
Cu (s) +
)
CO, (q)
CaCl, (aq) +
H,O fl)
following mean in an equation?
(s)
(o)
(l)
(aq)
3) Write the formulas for the following compounds:
Name
Formula
Name
sodium oxide
lead (ll) carbonate
potassium sulfate
lead (lV) carbonate
iron (ll) chloride
zinc phosphate
iron (lll) chloride
zinc phosphide
Formula
Chemical Equations - Homework
4) lUrite the correct formulas firsq then balance using smallest whole numbers
a) iron + nitrogen gas
)
iron (ll) nitride
b) lead + copper (ll) nitrate
)
lead (ll) nitrate + copper
c) calcium + dihydrogen monoxide
)
calcium hydroxide + hydrogen gas
d) potassium phosphate + iron (ll) nitrate
)
potassium nitrate + iron (ll) phosphate
5) Find the missing maset
a) lf 15 grams of nitrogen are reacted with 21 grams of hydrogen gas to form ammonia, how many grams of ammonia
willbe formed?
b) n 37 grams of zinc react with hydrochloric acid to torm 26 grams of zinc chloride and 16 grams of hydrogen gas,
how many grams of HClwere reacted?
c) How many grams of aluminum oxide must decompose to form 112 grams of aluminum metal and 1g grams of
oxygen gas?
Chemical Equations - Homework
Stoichiometry of Equations Homework
For:lLL mPle=cqnvetBio:t! Droblems. show ALL of vour work. includinq showinq which units cancel out
bv
puttlno a slash throuoh them.
1) For the reaction Nz (g) + Hz (g)
)
NH3
(g):
a) Balance the reac,tion:
Nz (g)
* *
b) How many moles
Hz
(g)
) d-
o$"r"
NHr (g)
3>
needed to make S.0 moles of NHg?
J,5
e, 5
c) How many moles
@"r"
t:3 **
d) How many moles
needed to completely react with 10.0 moles
;.
to^ol
f*J
x ln!*_
ff
of
^rla-
[Je
Hz?
; 3.33*;h
&J
d
ot@snould form if 6.0 moles of H2 are completely
reacted with N2?
( *"{o
tor-l
2l For the reaction Zn (s) + HBr (aq)
)
ZnBr2(aq) + Hz (g)
a) Balance the reaction:
Zn(s)+
?;
cxHBr(aq)) ZnBr2(aq)+ Hz(g) I',0.A(il
b) How many moles ot@areneeded to make g.0 moles olZnBrz?
t. o.'-{" }n9rr
,,(
*k'9"
*r{"
i
o@r"
4 c *oo [Jd
c) How many moles
g
{
"A*
=:
ilf""];
needed to make 4.0 moles
of
Hz?
.;::k "f$. :
f
u.'fl dt
odnilsnould
form if 5.0 moles of flpr are comptetely reacted with Zn?
r\*_J
--=---'.'l"*
l*Zn(x
.4
..
f
I
i.
^
'
a
'.,
:i;
!'
5, Jrr'
.^:-*;*;.*
# .: *t ls Lnil;(
d) How many moles
^":
_":j
1
*4."d
Ff
tdr
ChemicalEquations - Homework
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