The Language of Chemistry — CHEMISTRY STD 9 — Question

How did the name 'hydrogen' originate?

Name the sub-atomic particle whose charge is -1.

Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
Amonovalent metal

Select the odd one out and justify your answer.
Fe, Zn, Cu and Mg

Give an example of a reaction where the following is involved .
High pressure is required

Name a compound which produces carbon dioxide on heating.

Name the substance which makes water permanently hard.

A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.
Name the gas formed in the reaction. How would you test the gas?

What are valence electrons?