Question

1 choose the best answer. which equation shows that heat has been added? \\( \ce{h_{2}o ->\delta h_{2} + o_{2}} \\) \\( \ce{s + o_{2} <-> so_{2}} \\) \\( \ce{ag + 2s -> ag_{2}s} \\) \\( \ce{2k + i_{2} -> 2ki + energy} \\) 2 choose the best answer. which type of reaction occurs when elemental hydrogen and oxygen come together to form water? replacement compound synthesis decomposition 3 choose the best answer. ammonium nitrate, \\( \ce{nh_{4}no_{3}} \\), is a popular fertilizer because it decomposes into nitrogen gas (\\( \ce{n_{2}} \\)), oxygen gas (\\( \ce{o_{2}} \\)) and water vapor (\\( \ce{h_{2}o} \\)). which of the following best represents the products of this reaction? \\( \ce{n_{2}(g) + o_{2}(g) + h_{2}o(g)} \\) \\( \ce{nh_{4}(aq) + o_{2}(aq)} \\) \\( \ce{nh_{4}(g) + n_{2}(g) + h_{2}o(g)} \\) \\( \ce{nh_{4}(g) + no_{3}(g)} \\)

Explanation:

1. For question 1: The symbol $\Delta$ above the reaction arrow indicates that heat is added to drive the reaction forward.
2. For question 2: When two elements (hydrogen and oxygen) combine to form a single compound (water), this is defined as a synthesis reaction.
3. For question 3: The problem states ammonium nitrate ($\text{NH}_4\text{NO}_3$) decomposes into nitrogen gas ($\text{N}_2$), oxygen gas ($\text{O}_2$), and water vapor ($\text{H}_2\text{O}$), so this matches the listed product set.

Answer:

1. $\text{H}_2\text{O} \xrightarrow{\Delta} \text{H}_2 + \text{O}_2$
2. synthesis
3. $\text{N}_2(g) + \text{O}_2(g) + \text{H}_2\text{O}(g)$