Represent this reaction with a balance chemical equation. Solid aluminium hydride is formed by a combination reaction of its two elements.

2Al + 3H2 ==> 2AlH3

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To represent the reaction with a balanced chemical equation, we first need to know the chemical formulas of the elements involved.

From the given information, we know that the reaction involves solid aluminium (Al) and hydrogen (H₂). The chemical formula for solid aluminium is Al, and for hydrogen, it is H₂.

The reaction is described as a combination reaction, which means that two elements are coming together to form a compound. In this case, aluminium combines with hydrogen to form solid aluminium hydride.

Now we can write the balanced chemical equation for this reaction by following these steps:

Step 1: Write the formulas for the reactants on the left-hand side of the equation:
Al + H₂

Step 2: Write the formula for the product on the right-hand side of the equation:
AlH₃

Step 3: Balance the equation by ensuring the number of each element is the same on both sides. In this case, we need to balance the hydrogen atoms. Since there are two hydrogen atoms in H₂ but three hydrogen atoms in AlH₃, we can balance this by placing a coefficient of 2 in front of H₂:

2Al + 3H₂ → 2AlH₃

This balanced equation represents the reaction where solid aluminium hydride is formed by the combination of aluminium and hydrogen.