Diversity In Living Organisms — Science STD 9 — Question

Name the device or machines which convert:
Mechanical energy into electrical energy.

Name the process by which the various gases of the air are separated.

What is the reason for the different atomic masses of the isotopes of an element?

What is the maximum number of electrons which can be accommodated in the:
Innermost shell of an atom?

Which force is responsible for holding the solar system together?

Calculate the molar mass of the following substances:
Hydrochloric acid, HCl.

When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

What does the path of an object look like when it is in uniform motion?

What is the number of valence electrons in the atoms of an element having atomic number 13? Name the valence shell of this atom.