Diversity In Living Organisms — Science STD 9 — Question

In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed?

Why helium and neon do not take part in chemical reactions?

What kind of energy transformations takes place at a coal-based thermal power station?

Define velocity. What is the SI unit of velocity?

Name the cell organelle in which following structures are present:

1. Cristae.
2. Stroma
3. Centriole.
4. Chromosome.

Calculate the mass of 12.044 × 10²⁵ molecules of oxygen(O₂).

What for ATP stand?

A large truck and a car, both moving with a velocity of magnitude u, have a head on collision and both of them come to a half after that. If the collision lasts for.
Which vehicle experiences the greater change in momentum?

Classify the following materials as homogeneous mixtures and heterogeneous mixtures:
Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.