What factors affect the rate of a chemical reaction?
संक्षिप्त उत्तर
The rate of reaction increases with higher temperature, higher concentration (or pressure for gases), larger surface area and the presence of a catalyst. Collision theory explains why: particles react only when they collide with enough energy (the activation energy), and each factor increases the frequency or energy of collisions.
स्टेप-बाय-स्टेप
- Temperature: particles move faster, collide more often and more collisions have enough energy.
- Concentration or pressure: more particles in the same space, so more frequent collisions.
- Surface area: smaller pieces or powder expose more particles to collisions.
- Catalyst: provides a different pathway with a lower activation energy and is not used up.
हल किया गया उदाहरण
Marble chips and hydrochloric acid
- Powdered marble reacts faster than large chips
- Warmer acid reacts faster than cold acid
- Measure the rate by recording the volume of CO₂ given off each minute
आम गलतियाँ
- Saying particles collide harder at higher concentration. They collide more often, not harder.
- Saying a catalyst gives particles more energy. It lowers the activation energy instead.
- Leaving out the word frequency when explaining collision theory.
परीक्षा से पहले कमियाँ दूर करने का सबसे तेज़ तरीका है ट्यूटर के साथ वन-टू-वन क्लास। पहली क्लास मुफ़्त है।
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