Heat sources and flames questions | form one Chemistry

Draw a well labeled diagram of a nonluminous Bunsen burner flame

Answer / Solution

UNSOLVED

A bunsen burner flame will produce a luminous flame when

1. The air hole of the bunsen burner is fully closed
2. Sufficient gas is supplied to the Bunsen burner
3. The air hole of the Bunsen burner if fully opened
4. The gas tap is partially opened
5. The gas tap is fully opened

Answer / Solution

UNSOLVED

Draw a source of flame showing non-luminous zone, and on it show the outer zone, middle zone and inner zone.

Answer / Solution

UNSOLVED

When a burning fuel produces blue colour it means there is

1. adequate supply of oxygen with production of soot.
2. inadequate supply of oxygen without production of soot.
3. inadequate supply of oxygen with production of soot.
4. adequate supply of oxygen with production of less heat.
5. adequate supply of oxygen with production of more heat.

Answer / Solution

5. adequate supply of oxygen with production of more heat.

Technicians prefer to use blue flame in welding because

1. it is bright and non-sooty
2. it is light and non-sooty.
3. it is very hot and large.
4. it is very hot and non-sooty.
5. it is not expensive.

Answer / Solution

500. it is very hot and non-sooty.