Question 1: In one bottle you have a mixture of oxygen and hydrogen. In a second...
Question 1: In one bottle you have a mixture of oxygen and hydrogen. In a second one is water. Do they have the same energy? How do you know which one is a fuel and which is not?
Question 2: you have two systems: 1) solid gold and water 2) solid sodium and waterWhich one can spontaneously release energy and why?
Homework Answers
Answer 1:
- No, both will have different energies. The mixture of oxygen and hydrogen will have a higher energy than that of water.
- Mixture of oxygen and hydrogen has a tendency to react and form water if initially an adequate amount of energy is provided.
- This reaction is exothermic and releases a large amount of heat energy.
- Therefore, this mixture is used as a fuel.
- On the other hand, water is very stable and there will be no reaction taking place.
- Therefore, water will not act as a fuel.
Anwer 2:
- Solid Sodium and water will react spontaneously and release energy.
- This is based on the reactivity series. Sodium is a highly reactive metal and hence, it is placed at the top of the reactivity series. This is because it loses its outermost electron very readily. When it comes in contact with water, it reacts with it violently to form sodium hydroxide and hydrogen gas. This reaction is exothermic and hence, accompanied with a release of energy.
- Gold lies at the bottom of the reactivity series as it is very stable and does not give away its outermost electrons easily. Therefore, when it comes in contact with water, there is no reaction and no release of energy.
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