Math Mode is Quizalize's powerful equation editor that allows teachers of all subjects to quickly create beautiful equations. If you are a chemistry teacher you will find it particularly useful for creating equations for chemical reactions.

For a full description of Math Mode, check out this article. However it's super simple to use, just click the Math Mode toggle to switch the question editor into Math Mode and cut and paste the text below putting your equations between pairs of $ symbols.

#### Basic Equations

A key command to know is to use **\rightarrow** for equations along with **underscores** to create subscripts like this:

$Cu + O_2 \rightarrow CuO_2$

We can make this slightly better as in chemistry equations we prefer not to italicise the letters (in contrast to maths equations). We do this by putting the whole equation inside the **\mathsf{} **command.

$\mathsf{Cu + O_2 \rightarrow CuO_2}$

Note the **$\mathsf{** at the beginning and the **}$** at the end

Here is another:

$\mathsf{ CH_4 + O_2 \rightarrow CO_2 + H_2O }$

It's simple to add in the the states when required:

$\mathsf{ 2Na(s) + 2H_2O(l) \rightarrow 2NaOH(aq) + H_2(g) }$

For word equations, mix normal text with math mode like this:

sodium $+$ water $\rightarrow$ sodium hydroxide $+$ hydrogen

Use the superscript **^** symbol for ionic equations:

$\mathsf{ Mg(s)+ 2H^+(aq) \rightarrow H_2(g) + Mg^{2+}(aq) }$

#### Molecule diagrams

*Note: you may prefer just to use simple image questions and upload an image rather than creating molecule diagrams as follows. If so just jump to the end of this article and learn about image questions!*

You can use matrices to lay out molecule diagrams. The program will layout each cell in the matrix in the appropriate space allowing you to align the H above the C in the example below.

$\mathsf{ \begin{matrix}

& & H & & \\

& & \vert & & \\

H & - & C & - & H \\

& & \vert & & \\

& & H & &

\end{matrix} }$

Each cell is separated by an **&** symbol and each row is ended with a **\\** symbol. The first H and the C are both in the third cell on the first and third row, as are the two vertical lines created using **\vert **in the second and fourth rows.

In the example below the **= **symbol is used to represent a double bond and the **\diagup** and **\diagdown** commands used to draw diagonal lines. Seven cells separated by six & symbols are required in each row to align the diagram correctly:

$\mathsf{ \begin{matrix}

H & & & & & & H\\

& \diagdown & & & & \diagup &\\

& & C & = & C & & \\

& \diagup & & & & \diagdown & \\

H & & & & & & H

\end{matrix} }$

In the next example the **\equiv **symbol is used to represent a triple bond

$\mathsf{ \begin{matrix}

& & H & & & &\\

& & \vert & & & & \\

H & - & C & - & C & \equiv & N \\

& & \vert & & & & \\

& & H & & & &

\end{matrix} }$

#### Other useful symbols

A double vertical line for a double bond can be achieved with **\Vert **(note the **capital V** instead of the lower case v in \vert which gives a single vertical line).

$\Vert$

There's no single command for double diagonal bonds, but you can put two diagonal lines next to each other and use the \! to remove the spacing like this:

$\diagup \!\!\! \diagup$

$\diagdown \!\!\! \diagdown$

Don't forget, if you want to do even more complicated stuff, the best solution may well be to use a drawing package to create an image and then upload the image into an image question type.

With a bit of creativity you can do also create electron equations like this:

$\mathsf{\begin{matrix}

: & \ddot{Cl} & .\\

& \space{\ddot{}} &

\end{matrix}}$

And then:

$\mathsf{ \begin{matrix}

: & \ddot{Cl} & . + 1e^- \rightarrow \space : & \ddot{Cl} & :^-\\

& \space{\ddot{}} & & \space{\ddot{}} &

\end{matrix}}$

#### Using Images

Don't forget that for more complicated diagrams you can simply upload an image and create an image question type. You can either download a royalty free image from an online source, or you can create your own using a free software package like these two:

Avogadro is a great free program for creating beautiful 3D molecular modules.

Chemix is a great free online program for drawing science lab diagrams and school experiment apparatus. Easy sketching for both students and teachers.

And there are many more!