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Why must you use hot water bath to melt the naphthalene instead of heating it directly over a flame?
Wiki User
∙ 10y ago
Heating it on a flame will cause possibly dangerous vapour. Hot water avoids this.
Wiki User
∙ 10y ago
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On a Bunsen burner which flame is the 'clean' flame for heating?
Blue flame is a clean flame.
Which type of flame will you use for heating?
the blue flame
Which flame is not suitable for heating in Bunsen burner and why?
The yellow flame because that is the safety flame
What type of flame should be used for heating solids?
a blue flame
Why is the blue flame on the Bunsen burner used for heating?
It's hotter than the yellow flame.
What is considered an open fire?
An "open flame" refers to flame, usually used as a heating source, that is directly exposed to the outside elements, or often the object to be heated. Examples would include a Bunsen burner, a bonfire, or in some cases grills. The opposite would include heating elements that do not directly openly expose the flame, such as old stoves or heating elements.
The best method of heating fluid in a tube is to point the flame directly at the bottom of the tube?
false
On a Bunsen burner which flame is the 'clean' flame for heating?
Blue flame is a clean flame.
Which type of flame will you use for heating?
the blue flame
Which flame is not suitable for heating in Bunsen burner and why?
The yellow flame because that is the safety flame
What type of flame should be used for heating solids?
a blue flame
What is appearance of a flame that is used for heating?
luminous
How do you obtain a blue flame from a Bunsen burner?
You would have to close the collar instead of opening it. This will produce a yellow flame. But it is not suitable for heating. Only a blue flame is suitable for heating as it is much hotter than a yellow flame. M.F. - The yellow smoky flame is the lack of Oxygen (O2) mixing with the Hydrocarbon methane (CH4)
Would you heat a mixture of solutions directly on a flame or a water bath?
It depends on the solutions you mixed. If they are non-flammable, heating them on a flame would be fine. If they are flammable, I would use both a water bath and an electric hot plate.
What is the colour of the flame for heating?
The flame should be very pale blue (almost invisible) for heating strongly. This is achieved by opening the air hole fully.
Why is a Bunsen burner not used for heating when the air hole is closed?
When the air hole is closed, the flame is a luminous flame. This flame is not ideal for heating for the following reasons: it is not as hot as the non-luminous flame it is very unstable it produces a lot of soot thus, only non-luminous flames (the blue one) is ideal for heating. :)
Why is the blue flame on the Bunsen burner used for heating?
It's hotter than the yellow flame.
