드라이아이스 속 마그네슘 연소

마그네슘이 고체 이산화탄소 속에서 계속 연소하며 CO₂를 탄소로 환원하기

Classroom Demonstrations Advanced (University) 25 분 ~$15.00

목표

마그네슘이 이산화탄소를 환원할 수 있음을 실증하고, CO₂가 항상 불을 끈다는 오개념을 극복한다.

배경

Magnesium burns so intensely (over 3000°C) that it can reduce carbon dioxide to elemental carbon. When a burning magnesium ribbon is placed in a cavity carved into dry ice (solid CO₂), it continues to burn brilliantly white, producing magnesium oxide (white powder) and elemental carbon (black specks). This reaction (2Mg + CO₂ → 2MgO + C) dramatically shows that CO₂ is not always an effective fire extinguisher and that thermodynamic favorability depends on the specific reactants involved.

안전 경고

  • Burning magnesium is extremely bright — never look directly at it without shade protection
  • Dry ice causes frostbite on contact — never handle with bare hands
  • Perform behind a safety shield
  • Keep a fire-resistant mat underneath
  • Do not attempt to extinguish burning Mg with water — explosion risk
  • Ensure ventilation — CO₂ accumulation in enclosed spaces is dangerous

필수 개인 보호 장비

goggles gloves lab_coat face_shield

재료

  • Magnesium ribbon (30 cm)
    Clean, bright surface
  • Dry ice block (1 kg)
    Solid CO₂ (−78.5°C)
  • Tongs (long-handled) (1)
    For handling dry ice

장비

Safety shield Fire-resistant mat Chisel or screwdriver (for carving cavity in dry ice) Lighter or matches Welding goggles or #14 shade glass

실험 절차

1

Using tongs, carve a small cavity (about 3 cm deep) in the dry ice block. Place the dry ice on a fire-resistant mat.

3 분 Wear insulated gloves for dry ice
2

Set up the safety shield between the demonstration and the audience. Distribute welding goggles or instruct everyone to look away when ignited.

2 분
3

Light one end of the magnesium ribbon. Once burning, quickly place it in the dry ice cavity using tongs.

2 분 Do not look directly at the flame
4

Place another piece of dry ice on top to create a CO₂ atmosphere around the burning magnesium.

2 분
5

Observe: the magnesium continues to burn with an intense white flame inside the CO₂ environment. It does NOT go out.

3 분 Maintain safe distance
6

After the reaction, examine the residue: white MgO powder and black carbon specks. Discuss the reaction: 2Mg + CO₂ → 2MgO + C.

8 분 Wait for residue to cool completely
7

Discuss implications for fire safety: why Mg fires cannot be extinguished with CO₂, water, or standard fire extinguishers.

5 분

예상 결과

The magnesium continues to burn brilliantly inside the dry ice. After the reaction, white MgO and black carbon specks are visible in the dry ice cavity. This proves CO₂ has been reduced to elemental carbon.

정리

Allow all residues to cool and dry ice to sublimate. Sweep up MgO and carbon residue. No chemical waste disposal needed.

세부 정보

카테고리
Classroom Demonstrations
난이도
Advanced (University)
소요 시간
25 분
예상 비용
$15.00
단계
7
재료
3

더 많은 실험

진동하는 브릭스-라우처 반응 40 min 나트륨과 물의 반응 25 min 아이오딘 시계 반응 45 min 사라지는 비커(굴절률 매칭) 15 min 코끼리 치약 20 min 테르밋 반응 30 min 루미놀 화학발광 30 min 비뉴턴 유체: 우블렉 20 min 밀도 컬럼 무지개 30 min 순간 냉동: 과냉각수 120 min

Frequently Asked Questions

What is the objective of 드라이아이스 속 마그네슘 연소?
마그네슘이 이산화탄소를 환원할 수 있음을 실증하고, CO₂가 항상 불을 끈다는 오개념을 극복한다.
How difficult is 드라이아이스 속 마그네슘 연소?
This experiment is rated as Advanced (University). It takes approximately 25 minutes to complete.
What safety precautions are needed for 드라이아이스 속 마그네슘 연소?
Key safety precautions include: Burning magnesium is extremely bright — never look directly at it without shade protection; Dry ice causes frostbite on contact — never handle with bare hands; Perform behind a safety shield.
What materials are needed for 드라이아이스 속 마그네슘 연소?
The main materials required are: Magnesium ribbon, Dry ice block, Tongs (long-handled).
What results should I expect from 드라이아이스 속 마그네슘 연소?
The magnesium continues to burn brilliantly inside the dry ice. After the reaction, white MgO and black carbon specks are visible in the dry ice cavity. This proves CO₂ has been reduced to elemental carbon.