A chemical compound that makes up the striking heads of match stick is …………………

Chemical compound that can be used to soften hard water.

No chemical compound of helium is known.

Name the chemical substance that fills up the cells of bark?

A compound is made up of one element.

Pick up the wrongly matched pair

Compounds are made up of elements.

Which tissue makes up the husk of coconut?

A metre stick is pivoted about its centre. A piece of wax of mass 20 g travelling horizontally and perpendicular to it at 5 m/s strikes and adheres to one end of the stick so that the stick starts to rotate in a horizontal circle. Given the moment of inertia of the stick and wax about the pivot is 0.02 kg m^(2) , the initial angular velocity of the stick is :

Compound used in safety matches is :