For the reaction between magnesium metal and hydrochloric acid: 1. Formula equat

Question

For the reaction between magnesium metal and hydrochloric acid:

1. Formula equation:

2. Complete ionic equation:

3. Net ionic equation:

4. show the calculation for the theoretical enthalpy of reaction(triangleHrxn) from the enthalpies of formation(trianeH degree circlef) of the reactant and productain the net ionic equation.

For the reaction between sodium hydroxide and water:

1. Formula equation:

2. Net ionic equation:

3. Show the calculations for the theoretical heat of solution(triangleHrxn)from the heats of formation(H degree circlef)of the reactant and product in net ionic equation.

4. Was this an endothermic or exothermic reaction?

For the reactions between ammonium nitrate and water:

1.     Formula equation:

2.     2. Complete ionic equation:

3.     3. Net ionic equation:

4.     4. show the calculation for the theoretical enthalpy of reaction(triangleHrxn) from the enthalpies of formation(trianeH degree circlef) of the reactant and productain the net ionic equation.

5.     Was this an endothermic or exothermic reaction?

6.     How would you use the Enthalpies of Formation table to predict if the process of dissolving a compound in water is an exothermic or endothermic process?

7.     Briefly describe the differences between the nature of the particles in the solid substance before the reaction, and the nature of the particles in the resulting aqueous solution.

Explanation / Answer

Reaction of Mg metal with Hydrochloric acid

Principally all reactions of metal Mg with strong acid (H+) come to the same equation:

Mg(s) + 2H+(aq) ? Mg2+(aq) + H2(g)

Mg dissolves in HCl

If you add Mg metal (Mg) to hydrochloric acid (HCl), the Mg will dissolve and will form bubbles of hydrogen gas (H2). As a result of the reaction, water vapour will also be released, and when measuring the volume of H2(g), you need to take into account that water vapour is mixed with the H2(g). When the Mg dissolves, it forms magnesium ions with a +2 charge (Mg2+) , and when the hydrogen atoms form H2 gas, they leave behind chloride ions, Cl-. Then, the Mg2+ ions will bond with the Cl- ions. Here is the single replacement reaction equation:

Mg(s) + 2 HCl(aq) ? MgCl2

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