2. Chemistry Balancing equations

See: https://mirror.cse.unsw.edu.au/pub/CTAN/macros/latex/contrib/mhchem/mhchem.pdf

The mhchem package makes it easy to write balanced chemical equations.
mhchem_balancing.png 
 1\documentclass[border=5mm]{standalone}
 2\usepackage[version=4]{mhchem}
 3\usepackage{xcolor}  % Ensure xcolor is included
 4
 5\begin{document}
 6\begin{minipage}{\textwidth}
 7
 8\section*{Balancing Equations Worksheet}
 9
10\begin{enumerate}
11    \item H$_3$PO$_4$ + 3 KOH $\rightarrow$ K$_3$PO$_4$ + 3 H$_2$O
12    \item 6 K + B$_2$O$_3$ $\rightarrow$ 3 K$_2$O + 2 B
13    \item HCl + NaOH $\rightarrow$ NaCl + H$_2$O
14    \item 10 Na + 2 NaNO$_3$ $\rightarrow$ 6 Na$_2$O + N$_2$
15    \item 4 C + S$_8$ $\rightarrow$ 4 CS$_2$
16    \item 4 Na + O$_2$ $\rightarrow$ 2 Na$_2$O
17    \item 2 N$_2$ + 5 O$_2$ $\rightarrow$ 2 N$_2$O$_5$
18    \item 2 H$_3$PO$_4$ + 3 Mg(OH)$_2$ $\rightarrow$ Mg$_3$(PO$_4$)$_2$ + 6 H$_2$O
19    \item 2 NaOH + H$_2$CO$_3$ $\rightarrow$ Na$_2$CO$_3$ + 2 H$_2$O
20    \item KOH + HBr $\rightarrow$ KBr + H$_2$O
21    \item 4 Na + O$_2$ $\rightarrow$ 2 Na$_2$O
22    \item 2 Al(OH)$_3$ + 3 H$_2$CO$_3$ $\rightarrow$ Al$_2$(CO$_3$)$_3$ + 6 H$_2$O
23    \item 16 Al + 3 S$_8$ $\rightarrow$ 8 Al$_2$S$_3$
24    \item 6 Cs + N$_2$ $\rightarrow$ 2 Cs$_3$N
25    \item Mg + Cl$_2$ $\rightarrow$ MgCl$_2$
26    \item 10 Rb + 2 RbNO$_3$ $\rightarrow$ 6 Rb$_2$O + N$_2$
27    \item 2 C$_6$H$_6$ + 15 O$_2$ $\rightarrow$ 12 CO$_2$ + 6 H$_2$O
28    \item N$_2$ + 3 H$_2$ $\rightarrow$ 2 NH$_3$
29    \item 2 C$_{10}$H$_{22}$ + 3O$_2$ $\rightarrow$ 20 CO$_2$ + 22 H$_2$O
30    \item Al(OH)$_3$ + 3 HBr $\rightarrow$ AlBr$_3$ + 3 H$_2$O
31    \item 2 CH$_3$CH$_2$CH$_2$CH$_3$ + 13 O$_2$ $\rightarrow$ 8 CO$_2$ + 10 H$_2$O
32    \item C$_3$H$_8$ + 5 O$_2$ $\rightarrow$ 3 CO$_2$ + 4 H$_2$O
33    \item 3 Li + AlCl$_3$ $\rightarrow$ 3 LiCl + Al
34    \item 2 C$_2$H$_6$ + 7 O$_2$ $\rightarrow$ 4 CO$_2$ + 6 H$_2$O
35    \item 3 NH$_4$OH + H$_3$PO$_4$ $\rightarrow$ (NH$_4$)$_3$PO$_4$ + 3 H$_2$O
36    \item 3 Rb + P $\rightarrow$ Rb$_3$P
37    \item CH$_4$ + 2 O$_2$ $\rightarrow$ CO$_2$ + 2 H$_2$O
38    \item 2 Al(OH)$_3$ + 3 H$_2$SO$_4$ $\rightarrow$ Al$_2$(SO$_4$)$_3$ + 6 H$_2$O
39    \item 2 Na + Cl$_2$ $\rightarrow$ 2 NaCl
40    \item 16 Rb + S$_8$ $\rightarrow$ 8 Rb$_2$S
41    \item 2 H$_3$PO$_4$ + 3 Ca(OH)$_2$ $\rightarrow$ Ca$_3$(PO$_4$)$_2$ + 6 H$_2$O
42    \item NH$_3$ + HCl $\rightarrow$ NH$_4$Cl
43    \item 2 Li + 2 H$_2$O $\rightarrow$ 2 LiOH + H$_2$
44    \item Ca$_3$(PO$_4$)$_2$ + 3 SiO$_2$ + 5 C $\rightarrow$ 3 CaSiO$_3$ + 5 CO + 2 P
45    \item 4 NH$_3$ + 3 O$_2$ $\rightarrow$ 2 N$_2$ + 6 H$_2$O
46    \item 4 FeS$_2$ + 1O$_2$ $\rightarrow$ 2 Fe$_2$O$_3$ + 8 SO$_2$
47    \item 5 C + 2 SO$_2$ $\rightarrow$ CS$_2$ + 4 CO
48\end{enumerate}
49
50\end{minipage}
51\end{document}
mhchem_balancing_q.png 
 1\documentclass[border=5mm]{standalone}
 2\usepackage[version=4]{mhchem}
 3\usepackage{xcolor}  % Ensure xcolor is included
 4
 5\begin{document}
 6\begin{minipage}{\textwidth}
 7
 8\section*{Balancing Equations Worksheet}
 9
10\begin{enumerate}
11    \item {\color{lightgray}\dots} H$_3$PO$_4$ + {\color{lightgray}\dots} KOH $\rightarrow$ {\color{lightgray}\dots} K$_3$PO$_4$ + {\color{lightgray}\dots} H$_2$O
12    \item {\color{lightgray}\dots} K + {\color{lightgray}\dots} B$_2$O$_3$ $\rightarrow$ {\color{lightgray}\dots} K$_2$O + {\color{lightgray}\dots} B
13    \item {\color{lightgray}\dots} HCl + {\color{lightgray}\dots} NaOH $\rightarrow$ {\color{lightgray}\dots} NaCl + {\color{lightgray}\dots} H$_2$O
14    \item {\color{lightgray}\dots} Na + {\color{lightgray}\dots} NaNO$_3$ $\rightarrow$ {\color{lightgray}\dots} Na$_2$O + {\color{lightgray}\dots} N$_2$
15    \item {\color{lightgray}\dots} C + {\color{lightgray}\dots} S$_8$ $\rightarrow$ {\color{lightgray}\dots} CS$_2$
16    \item {\color{lightgray}\dots} Na + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} Na$_2$O
17    \item {\color{lightgray}\dots} N$_2$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} N$_2$O$_5$
18    \item {\color{lightgray}\dots} H$_3$PO$_4$ + {\color{lightgray}\dots} Mg(OH)$_2$ $\rightarrow$ {\color{lightgray}\dots} Mg$_3$(PO$_4$)$_2$ + {\color{lightgray}\dots} H$_2$O
19    \item {\color{lightgray}\dots} NaOH + {\color{lightgray}\dots} H$_2$CO$_3$ $\rightarrow$ {\color{lightgray}\dots} Na$_2$CO$_3$ + {\color{lightgray}\dots} H$_2$O
20    \item {\color{lightgray}\dots} KOH + {\color{lightgray}\dots} HBr $\rightarrow$ {\color{lightgray}\dots} KBr + {\color{lightgray}\dots} H$_2$O
21    \item {\color{lightgray}\dots} Na + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} Na$_2$O
22    \item {\color{lightgray}\dots} Al(OH)$_3$ + {\color{lightgray}\dots} H$_2$CO$_3$ $\rightarrow$ {\color{lightgray}\dots} Al$_2$(CO$_3$)$_3$ + {\color{lightgray}\dots} H$_2$O
23    \item {\color{lightgray}\dots} Al + {\color{lightgray}\dots} S$_8$ $\rightarrow$ {\color{lightgray}\dots} Al$_2$S$_3$
24    \item {\color{lightgray}\dots} Cs + {\color{lightgray}\dots} N$_2$ $\rightarrow$ {\color{lightgray}\dots} Cs$_3$N
25    \item {\color{lightgray}\dots} Mg + {\color{lightgray}\dots} Cl$_2$ $\rightarrow$ {\color{lightgray}\dots} MgCl$_2$
26    \item {\color{lightgray}\dots} Rb + {\color{lightgray}\dots} RbNO$_3$ $\rightarrow$ {\color{lightgray}\dots} Rb$_2$O + {\color{lightgray}\dots} N$_2$
27    \item {\color{lightgray}\dots} C$_6$H$_6$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} CO$_2$ + {\color{lightgray}\dots} H$_2$O
28    \item {\color{lightgray}\dots} N$_2$ + {\color{lightgray}\dots} H$_2$ $\rightarrow$ {\color{lightgray}\dots} NH$_3$
29    \item {\color{lightgray}\dots} C$_{10}$H$_{22}$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} CO$_2$ + {\color{lightgray}\dots} H$_2$O
30    \item {\color{lightgray}\dots} Al(OH)$_3$ + {\color{lightgray}\dots} HBr $\rightarrow$ {\color{lightgray}\dots} AlBr$_3$ + {\color{lightgray}\dots} H$_2$O
31    \item {\color{lightgray}\dots} CH$_3$CH$_2$CH$_2$CH$_3$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} CO$_2$ + {\color{lightgray}\dots} H$_2$O
32    \item {\color{lightgray}\dots} C$_3$H$_8$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} CO$_2$ + {\color{lightgray}\dots} H$_2$O
33    \item {\color{lightgray}\dots} Li + {\color{lightgray}\dots} AlCl$_3$ $\rightarrow$ {\color{lightgray}\dots} LiCl + {\color{lightgray}\dots} Al
34    \item {\color{lightgray}\dots} C$_2$H$_6$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} CO$_2$ + {\color{lightgray}\dots} H$_2$O
35    \item {\color{lightgray}\dots} NH$_4$OH + {\color{lightgray}\dots} H$_3$PO$_4$ $\rightarrow$ {\color{lightgray}\dots} (NH$_4$)$_3$PO$_4$ + {\color{lightgray}\dots} H$_2$O
36    \item {\color{lightgray}\dots} Rb + {\color{lightgray}\dots} P $\rightarrow$ {\color{lightgray}\dots} Rb$_3$P
37    \item {\color{lightgray}\dots} CH$_4$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} CO$_2$ + {\color{lightgray}\dots} H$_2$O
38    \item {\color{lightgray}\dots} Al(OH)$_3$ + {\color{lightgray}\dots} H$_2$SO$_4$ $\rightarrow$ {\color{lightgray}\dots} Al$_2$(SO$_4$)$_3$ + {\color{lightgray}\dots} H$_2$O
39    \item {\color{lightgray}\dots} Na + {\color{lightgray}\dots} Cl$_2$ $\rightarrow$ {\color{lightgray}\dots} NaCl
40    \item {\color{lightgray}\dots} Rb + {\color{lightgray}\dots} S$_8$ $\rightarrow$ {\color{lightgray}\dots} Rb$_2$S
41    \item {\color{lightgray}\dots} H$_3$PO$_4$ + {\color{lightgray}\dots} Ca(OH)$_2$ $\rightarrow$ {\color{lightgray}\dots} Ca$_3$(PO$_4$)$_2$ + {\color{lightgray}\dots} H$_2$O
42    \item {\color{lightgray}\dots} NH$_3$ + {\color{lightgray}\dots} HCl $\rightarrow$ {\color{lightgray}\dots} NH$_4$Cl
43    \item {\color{lightgray}\dots} Li + {\color{lightgray}\dots} H$_2$O $\rightarrow$ {\color{lightgray}\dots} LiOH + {\color{lightgray}\dots} H$_2$
44    \item {\color{lightgray}\dots} Ca$_3$(PO$_4$)$_2$ + {\color{lightgray}\dots} SiO$_2$ + {\color{lightgray}\dots} C $\rightarrow$ {\color{lightgray}\dots} CaSiO$_3$ + {\color{lightgray}\dots} CO + {\color{lightgray}\dots} P
45    \item {\color{lightgray}\dots} NH$_3$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} N$_2$ + {\color{lightgray}\dots} H$_2$O
46    \item {\color{lightgray}\dots} FeS$_2$ + {\color{lightgray}\dots} O$_2$ $\rightarrow$ {\color{lightgray}\dots} Fe$_2$O$_3$ + {\color{lightgray}\dots} SO$_2$
47    \item {\color{lightgray}\dots} C + {\color{lightgray}\dots} SO$_2$ $\rightarrow$ {\color{lightgray}\dots} CS$_2$ + {\color{lightgray}\dots} CO
48\end{enumerate}
49
50\end{minipage}
51\end{document}