촉매: 더 낮은 장벽, 동일한 전체 에너지 변화
도입됨| English | 의미 |
|---|---|
| catalyst/ˈkætəlɪst/ | 촉매 |
| catalysed pathway/ˈkætəlaɪzd ˈpæθweɪ/ | 촉매 반응 경로 |
What would explain this observation?
- A catalyst 催化剂 lets a reaction proceed faster without appearing as a consumed reactant in the overall equation. It changes the route, not the identities of the starting and finishing substances.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Catalysts increase reaction rate by providing a different reaction pathway with a lower activation energy. They are not used up overall, although they may participate in steps and be regenerated. Different reactions need different catalysts; enzymes act as catalysts in biological systems. On a reaction profile, the catalysed curve has a lower peak but the same reactant and product levels as the uncatalysed curve. The overall energy change is therefore unchanged.
- catalyst: A substance increasing reaction rate by a lower-activation pathway without being used up overall; catalysed pathway 催化反应路径: An alternative reaction route with a lower activation barrier.
적절한 촉매를 추가했을 때 프로파일에서 어떤 특징이 변합니까?
난이도 1/5 · 100 코인 + 오늘 첫 완료 시 소액 보너스
촉매는 낮은 활성화 장벽을 가진 다른 경로를 제공하므로, 촉매가 포함된 에너지 프로파일은 높은 봉우리가 낮아집니다. 반응물과 생성물의 에너지 및 전체 에너지 변화는 정확히 동일하게 유지됩니다.
각 전문 용어에 대한 정확한 의미를 매칭하시오.
난이도 2/5 · 140 코인 + 오늘 첫 완료 시 소액 보너스
정의를 사용하여 유사한 양과 과정을 구분하시오.
Choose evidence that can test it
- At the same temperature more colliding particles can meet the smaller activation requirement. This does not mean the catalyst adds energy to every particle or increases temperature by definition. Evidence for catalytic behaviour combines rate increase and regeneration/no net consumption. An unchanged small sample alone does not prove catalysis unless the reaction-rate effect is shown. The overall equation omits a regenerated catalyst from its stoichiometric reactant and product lists.
- Compare teacher-approved catalysed and uncatalysed trials with matching reactant quantities, concentrations, temperature and collection apparatus. Record time-dependent product measurements rather than only final volume. Use the specified catalysts in the course where required; do not memorise unrelated industrial names. Actual hydrogen peroxide catalyst demonstrations need the school’s selected dilute solutions and protection because rapid gas evolution and warming can occur.
이 경우 조사 또는 모델이 더 타당하게 만들 수 있는 두 가지 습관은 무엇인가?
난이도 2/5 · 140 코인 + 오늘 첫 완료 시 소액 보너스
조건과 가정을 명시하면 다른 사람이 정확히 작업을 재현할 수 있으며, 근거 증거를 기록하면 결론을 검증할 수 있습니다. 반대되는 결과를 숨기는 것은 잘못된 결론을 반박할 수 있는 증거를 제거하는 것이며, 한 번의 측정으로는 더 넓은 주장을 입증할 수 없습니다.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a supplied profile has reactants at 20, products at 5 and uncatalysed peak at 80 relative units. A catalysed peak is 50. Both paths decrease overall by 15 units; the barriers are visibly different. A fixed endpoint reached in 60 s without catalyst and 20 s with it gives a threefold ratio of mean rates to that endpoint, assuming the same measured amount.
The same fixed endpoint takes 72 s without catalyst and 24 s with it. Find the factor increase in mean rate. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
동일한 고정된 종점까지 무작위 촉매가 없을 때는 72 s, 있을 때는 24 s 걸린다. 평균 반응 속도의 증가 배수를 구하시오.
난이도 2/5 · 140 코인 + 오늘 첫 완료 시 소액 보너스
결과는 3 입니다. 주어진 조건:终点 (종점) reaches 72 s without catalyst, 24 s with it. Mean rate is proportional to 1/time for a fixed endpoint, so the factor = 72/24 = 3. The catalysed reaction reaches the same endpoint three times faster.
Check the conclusion and its limits
- Do not lower the product energy when drawing the catalysed path or describe the catalyst as consumed in the overall reaction. A catalyst does not increase the fixed limiting-reactant amount of product. At equilibrium it speeds both directions without changing the final composition under fixed conditions; this statement does not require equilibrium-constant calculations.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
A catalyst must be consumed as a reactant in the overall equation. This claim is false: A catalyst is chemically unchanged at the end of the reaction and never appears in the overall equation as a reactant. It participates in the pathway but is regenerated - a consumed substance is a reactant.
Catalysts: a lower barrier, the same overall energy change: At the same temperature more colliding particles can meet the smaller activation requirement. This does not mean the catalyst adds energy to every particle or increases temperature by definition. Evidence for catalytic behaviour combines rate increase and regeneration/no net consumption. An unchanged small sample alone does not prove catalysis unless the reaction-rate effect is shown. The overall equation omits a regenerated catalyst from its stoichiometric reactant and product lists.
촉매는 전체 방정식에서 반응물처럼 소모되어야 합니다.
난이도 1/5 · 100 코인 + 오늘 첫 완료 시 소액 보너스
촉매는 반응 종료 시 화학적으로 변하지 않으며, 전체chemical equation에서 반응물로 나타나지 않습니다. 경로를 거치지만 재생되며, 소모되는 물질은 반응물입니다.
반응 속도를 증가시키되 전체적으로는 소모되지 않고 더 낮은 활성화 에너지를 제공하는 물질: 기술 용어를 쓰시오.
난이도 1/5 · 100 코인 + 오늘 첫 완료 시 소액 보너스
촉매는 전체적으로 소모되지 않으면서 더 낮은 활성화 에너지를通路를 통해 반응 속도를 증가시키는 물질을 뜻합니다.