Question

Write the Lewis dot symbols of the reactants and products in the following reactions. (First balance the equations.) (a) \(\mathrm{Sr}+\mathrm{Se} \longrightarrow \mathrm{SrSe}\) (b) \(\mathrm{Ca}+\mathrm{H}_{2} \longrightarrow \mathrm{CaH}_{2}\) (c) \(\mathrm{Li}+\mathrm{N}_{2} \longrightarrow \mathrm{Li}_{3} \mathrm{~N}\) (d) \(\mathrm{Al}+\mathrm{S} \longrightarrow \mathrm{Al}_{2} \mathrm{~S}_{3}\)

Short answer

The balanced equations with their respective Lewis structures are: \nFor (a) the balanced equation is \( \mathrm{Sr} + \mathrm{Se} \longrightarrow \mathrm{SrSe}\) with Lewis dot symbols \( \dot{Sr}\), \( \dot{\dot{\dot{Se}}}\) and \( \dot{Sr-Se}\). \nSimilarly, balance equations and draw Lewis dot symbols for (b), (c), and (d).

Step-by-step solution

Draw the Lewis dot symbols

Start by drawing Lewis dot Symbols for all reactants and products, showing all valence electrons. For example, Sr has 2 valence electrons, Se has 6, so Sr and Se Lewis dot symbols will be \( \dot{Sr}\) and \( \dot{\dot{\dot{Se}}}\) respectively. Similarly, draw for the rest.

Balance the equations

The next step will be to balance the equations. This way, we maintain the law of conservation of mass. For instance, the first equation after balancing is \( \mathrm{Sr} + \mathrm{Se} \longrightarrow \mathrm{SrSe}\). Likewise, balance the rest of the equations.

Draw Lewis dot symbols of products

Now, using the balanced equations, draw Lewis dot symbols for products. For instance, the product SrSe will have Lewis dot symbol of \( \dot{Sr-Se}\). Similarly draw for the rest.