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I have some questions on bunsen burner?...?

1) Which feature regulates the size of the flame?

2) Which feature regulates the color of the flame?

3) Why does the flame change when the collar is changed from closed to open?

4) In terms of chemical reactions, what conclusion can be drawn about the two flames?

Answers (3)

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1) Which feature regulates the size of the flame?

2) Which feature regulates the color of the flame?

3) Why does the flame change when the collar is changed from closed to open?

4) In terms of chemical reactions, what conclusion can be drawn about the two flames

mr-damon.com/experiments/bunsen/

See web site above!

The flame is the evidence of the combustion of the methane gas. To enlarge the flame, more gas must flow into the burner. The methane needs oxygen to burn. The oxygen comes from the air. The temperature of the flame is dependent on the ratio of methane and oxygen.

When insufficient oxygen is present the temperature is lower, and the flame is yellowish orange. This means the methane gas is not completely burned.

By adjusting the air vent, you increase or decrease the amount of O2 available for combustion. The hottest flame has 2 distinct regions, which I call the inner and outer cones. The hottest point is at the tip of the inner cone. I had students place a thin copper wire at that point, and the copper wire melted. 1083°C is the melting point of Copper.

As the temperature of the burning gas increases the color of the flame changes from yellowish orange to light blue to the 2 distinct regions described above.

The color of the flame is the result of the energy produced by the chemical reaction. You are watching “light” change color as you adjust the gas and air.

The color of light is dependent on the energy of the light wave. Later on in chemistry, you will learn what part of the atom causes the color!

If you throw some thin copper wire into a campfire, you will see the color of the light produced by very hot copper!

Enjoy your time in chemistry and be careful!

I hope this helps!

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1...The gas regulator

2...The air regulator

3...By opening the collar, excess air is drawn in and the flame becomes more blue and hotter.

4...When closed, the flame is slow, lazy and smokey due to insufficient oxygen causing incomplete combustion. When open....see Ans. 3.