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This question asks for two things: 

1. A balanced chemical equation for the decomposition reaction of solid mercury(II) oxide into liquid mercury and oxygen gas.
2. A visual representation of this reaction using Legos as a model for the atoms, both before and after the reaction.

The balanced chemical equation provided in the image is correct:

\[2 \, \text{HgO (s)} \rightarrow 2 \, \text{Hg (l)} + \text{O}_2 \text{(g)}\]

This equation shows that two formula units of mercury(II) oxide (solid) decompose to form two atoms of liquid mercury and one molecule of oxygen gas.

Part (b) of the question asks you to represent this reaction using a model. Although you'll physically create the model using Legos, you're requested to draw a picture of the "before" and "after" states.

Before the reaction, you'd draw a representation of four formula units of HgO. As it stands, a "formula unit" can be thought of as the smallest repeating unit that composes a compound—in this case, mercury(II) oxide. Each unit would contain one mercury (Hg) atom connected to one oxygen (O) atom. So, if you were to draw this, you'd have four HgO units connected together.

After the reaction, these units would be separated into mercury atoms and oxygen molecules. You would draw the mercury units (Hg) separately from each other because they are now in the liquid form. You would draw one oxygen molecule, comprised of two oxygen atoms (O2), to represent the gas formed from the decomposition of two HgO units.

Label the mercury as "Hg" and the oxygen as "O" on both the "before" and "after" drawings to make clear which atoms are which.

Since this is a text-based interface, I can't physically draw the diagrams for you, but you can imagine or sketch them out based on these directions. In the "before" box, visualize or sketch four connected HgO units. In the "after" box, place two separate Hg units (since the question shows liquid mercury, you could depict them as somewhat together but not in a fixed position like in a solid) and one O2 molecule, consisting of two connected O atoms.

II. Reactions Involving Ionic Compounds
3. Consider the reaction of solid mercury(ll) oxide, HgO, to form liquid mercury metal and
oxygen gas.
(a)Write a balanced equation for this reaction, making sure that your coefficients are the lowest
possible whole numbers. Remember to include physical state symbols.
( 02
(b) Using Legos@ to represent the atoms, build a mini-crystal of solid mercury (II) oxide that
consists of four formula units ofHgO(s). Draw a picture of your model in the "before" box.
Then, pull apart your model in a way that represents your products listed in question 3(a), and
draw a picture of this model in the "after" box (you may want to reference the balanced
equation you wrote in 3(a)). Label them as mercury or oxygen.
Before
After


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