Identifying fibres – burning test.

Identifying fibres burining test: If the yarn melts in the flame, what is the yarn?

Identifying fibres burining test: If is smells like burining paper, what is the yarn?

Identifying fibres burining test: If is smells like burining hair, what is the yarn?

In “Identification of fibres – Burning test activity what are the precautions to be taken.

‘X’ is fibre. It gives smell like burning of paper in burning test and it is an artificial fibre. ‘X’ may be

When artificial fibre is burnt

A student takes about 2ml of ethanoic acid in a test tube and adds a pinch of NaHCO_3 to it. He reports the following. Immediately a colourless and odourless gas evolves with a brisk effervescene. The gas turns lime water milky The gas burns with an explosion when a burning splinter is brought near it The gas extinguishes the burning splinter.

Are the materials present before burning and after burning the same ?

Artificial fibre is

Draw the diagram that showing the reaction of zinc granules with dll. HCI and testing hydrogen gas by a burning matchstick.