Identify the type of the following invariant reaction: $liquid \ 1 + solid \ 1 \rightleftharpoons solid \ 2$
Identify Peritectic Reaction Type
The question asks to identify the type of the invariant reaction:
$ liquid \ 1 + solid \ 1 \rightleftharpoons solid \ 2 $
An invariant reaction occurs at a specific temperature and pressure where multiple phases react to form one or more different phases.
Invariant Reaction Definitions
Here's a breakdown of common invariant reaction types in phase diagrams:
| Reaction Type | Phases Involved (Reactants → Products) | Example Equation |
|---|---|---|
| Eutectic | Liquid → Solid 1 + Solid 2 | $L \rightarrow S_1 + S_2$ |
| Eutectoid | Solid 1 → Solid 2 + Solid 3 | $S_1 \rightarrow S_2 + S_3$ |
| Peritectic | Liquid + Solid 1 → Solid 2 | $L + S_1 \rightarrow S_2$ |
| Peritectoid | Solid 1 + Solid 2 → Solid 3 | $S_1 + S_2 \rightarrow S_3$ |
Reaction Analysis
Compare the given reaction with the definitions:
- The reaction involves one liquid phase and one solid phase reacting ($liquid \ 1 + solid \ 1$).
- These reactants form a single, different solid phase ($solid \ 2$).
- This transformation ($L + S_1 \rightarrow S_2$) directly matches the definition of a Peritectic reaction.
Therefore, the invariant reaction $liquid \ 1 + solid \ 1 \rightleftharpoons solid \ 2$ is a Peritectic reaction.
Important Questions from Phase Diagrams Gibbs Phase Rule Variance
- In the Fe-C system, the invariant reaction Liquid + $\delta \rightleftharpoons \gamma$ takes place at 1493 °C.
This type of reaction is called __________. Maximum number of phases that can be in equilibrium for a 5-component system at constant temperature and pressure is ________ (in integer).
- Match the names listed in Group I with the reactions listed in Group II
Group I Group II P. Eutectic 1. $\gamma + \beta \rightarrow \alpha$ Q. Peritectic 2. $L \rightarrow \alpha + \beta$ R. Peritectoid 3. $L_1 \rightarrow L_2 + \alpha$ S. Monotectic 4. $L + \beta \rightarrow \alpha$ - Two phases $\alpha$ and $\beta$ are in thermodynamic equilibrium. If x and y are the only components present in the phases $\alpha$ and $\beta$ and if $\mu_i^j$ represents the chemical potential of component i in phase j, then the condition for equilibrium is
Consider the phase diagram of a one component system given below. $V_\alpha$, $V_\beta$, and $V_{Liquid}$ are the molar volumes of $\alpha$, $\beta$, and liquid phases, respectively.
Which one of the following statements is TRUE?
Given: The change in molar enthalpies, $\Delta H^{\alpha \to \beta}$ and $\Delta H^{\beta \to Liquid}$, are positive.
