States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
![**Equilibrium Constant Expression**
In the reaction given:
\[ 2 \text{K}_3\text{PO}_4(\text{aq}) + 3 \text{Ca(NO}_3\text{)}_2(\text{aq}) \rightleftharpoons 6 \text{KNO}_3(\text{aq}) + \text{Ca}_3(\text{PO}_4)_2(\text{s}) \]
We are tasked to write the equilibrium constant expression \(K_{eq}\).
**Explanation:**
The equilibrium constant expression for a reaction is given by the concentration of the products raised to their stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients. Only species in the aqueous (aq) and gaseous (g) states are included in the expression; solids (s) and liquids (l) are excluded.
**For the given reaction:**
- Products: \(6 \text{KNO}_3(\text{aq})\)
- Reactants: \(2 \text{K}_3\text{PO}_4(\text{aq})\) and \(3 \text{Ca(NO}_3\text{)}_2(\text{aq})\)
The solid calcium phosphate (\(\text{Ca}_3(\text{PO}_4)_2\)) is not included in the expression.
**Equilibrium Expression:**
\[ K_{eq} = \frac{[\text{KNO}_3]^6}{[\text{K}_3\text{PO}_4]^2[\text{Ca(NO}_3\text{)}_2]^3} \]
This expression allows for the calculation of the equilibrium constant, which indicates the extent of the reaction at equilibrium.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F071308d7-afeb-43fe-9b31-e0a2411c122d%2Fc2915f3f-233e-41d9-b374-8854869045cc%2F3obycx_processed.png&w=3840&q=75)
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