An ionic compound has a solubility of 30 g per 100 mL of water at room temperature. A solution containing 70 g of the compound i
1 answer:
Answer: A. unsaturated.
Explanation:
Unsaturated solution is defined as the solution in which more solute particles can be dissolved in the solvent.
Saturated solution is defined as the solution in which no more solute particles can be dissolved in the solvent.
Supersaturated solution is defined as the solution in which more amount of solute particles is present than the solvent particles.
Given: Solubility = 30g/100ml
If 100 ml can dissolve ionic compound = 30 g
300 ml can dissolve ionic compound =
Thus solubility is 90g/300 ml and dissolved salt is only 70 g , the solution is said to be unsaturated.
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Answer:
Option 3. The catalyst does not affect the enthalpy change () of a reaction.
Explanation:
As its name suggests, the enthalpy change of a reaction () is the difference between the enthalpy of the products and the reactants.
On the other hand, a catalyst speeds up a reaction because it provides an alternative reaction pathway from the reactants to the products.
In effect, a catalyst reduces the activation energy of the reaction in both directions. The reactants and products of the reaction won't change. As a result, the difference in their enthalpies won't change, either. That's the same as saying that the enthalpy change of the reaction would stay the same.
Refer to an energy profile diagram. Enthalpy change of the reaction measures the difference between the two horizontal sections. Indeed, the catalyst lowered the height of the peak. However, that did not change the height of each horizontal section or the difference between them. Hence, the enthalpy change of the reaction stayed the same.
