Is Matter Around Us Pure — Science STD 9 — Question

Name a metal:
Which form amalgams.

What is a group of 6.022 × 10²³ particles known as?

When a drop of blue ink is put in water, the blue colour spreads and the whole solution becomes blue. Name the phenomenon due to which this happens.

Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures:
A volatile and a non-volatile component.

What helps in determining the formula of an ionic compound?

Which part of an atom was discovered by Rutherford’s alpha particle scattering experiment?

If the fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the process which brings this smell to us.

What is meant by saying that the latent heat of vaporization of water is 22.5 × 10⁵J/ kg?

The boiling point of alcohol is 78°C. What is this temperature on Kelvin scale?

Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element?