Check the reactions which are exothermic. (Select all that apply.) O H,O(I) → H,O(g) O 0,(g) →2 0(g) O2 H(g) H (g) O N2(g)2 N(g) OCH(g) + 2 0,(g) CO,(g) + 2 H,O(g)
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
![### Identifying Exothermic Reactions
**Question:**
Check the reactions which are exothermic. (Select all that apply.)
**Options:**
1. [ ] H₂O(l) → H₂O(g)
2. [ ] O₂(g) → 2 O(g)
3. [ ] 2 H(g) → H₂(g)
4. [ ] N₂(g) → 2 N(g)
5. [ ] CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)
**Explanation:**
The problem presents five chemical reactions. Your task is to identify which of these reactions releases energy in the form of heat, making them exothermic processes. The notation for states of matter are as follows:
- (l) denotes liquid
- (g) denotes gas
**Note:**
- Exothermic reactions release heat and generally result in a temperature rise in the surroundings.
- Endothermic reactions absorb heat and generally result in a cooling effect in the surroundings.
**Reactions Analysis:**
- Reaction 1: Evaporation of water (usually an endothermic process).
- Reaction 2: Dissociation of oxygen molecules (endothermic).
- Reaction 3: Formation of hydrogen molecules (potentially exothermic depending on context).
- Reaction 4: Dissociation of nitrogen molecules (endothermic).
- Reaction 5: Combustion of methane, which is a well-known exothermic reaction.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5fe141b1-9817-4d6d-9b09-948fe13c457c%2F0c9192f8-c727-4f42-957e-63acd35c6b4d%2Fm4qdu_processed.jpeg&w=3840&q=75)
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