Structure of the Atom — Science STD 9 — Question

Write the dispersed phase and dispersion medium present in foam. Give an example.

Classify the following as physical or chemical properties:
Metallic sodium is soft enough to be cut with a knife.

Calculate the molecular mass of hydrogen bromide (HBr).
(Atomic masses: H = 1u; Br = 80u)

How many cm³ are there in 1L?

Who discovered canal rays?

Give a brief description of the following: 
Relative atomic mass.

What is the similarity in the electronic structure of the following set of atoms?

1. Lithium.
2. Sodium.
3. Potassium.

Convert into mole.
22g of carbon dioxide.

Bromine particles are almost twice as heavy as chlorine particles. Which gas will diffuse faster; bromine (vapour) or chorine? Explain your answer.

Compare a proton and a neutron in respect of mass and charge.