Presentation on theme: "Click here for the next page Calcium carbide combines with water to form Acetylene and Calcium Hydroxide. 1CaC 2 + 2 H 2 O ==== 1C 2 H 2 + 1 Ca(OH) 2."— Presentation transcript:
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Calcium carbide combines with water to form Acetylene and Calcium Hydroxide. 1CaC H 2 O ==== 1C 2 H Ca(OH) 2 Acetylene is a very good fuel and gives off a lot of heat. Normal burning in air however produces a lot of soot and a very yellow flame.
Acetylene burning at the end of a test tube with water in it. Evidence of incomplete combustion Bright yellow flame… incandescent soot particles Soot
A clean burning flame with adequate oxygen
Not much soot but still inadequate oxygen Incandescent soot particles glow and make the flame yellow
Oxygen tube Acetylene tube Gases are mixed here Just a seal for a 2 hole stopper
Oxygen tank and regulator is expensive but can be used often in class and is worth the cost.
An old iron screen works well as the target of the ACETYLENE TORCH!
Observe the next picture and see if you can tell why one setup is safer to use than the other. Boom?
Students should stand back from the other side of the screen.
Click on picture to start movie; click here to stop