CHEMISTRY CH14 Acids, Bases and Salts — Science STD 9 — Question

How is compost prepared?

List the important methods of vermicomposting.

What is a solution?

Higher Order Thinking Skill.

Yugaa wants to buy a plastic water bottle. She goes to the shop and sees four different kinds of plastic bottles with resin codes 1, 3, 5 and 7. Which one should she buy? Why?

Relate the names of the following scientists with the statements given below. (Mendeleev, Newlands, Dobereiner).a) Arranged elements into groups containing three elements each.b) Arranged elements in a group of seven with increasing atomic masses and eighth elements with similar properties kept below the first like eight note in an act of music.c) Arranged elements in the increasing order of atomic mass

Name the compounds used in fertilizers.

Roots grow very deep and reach the layers where water is available. Which type of plants develops the above adaptation? Why?

What is centrifugation?

Who introduced the term latent heat?

What are the types of vegetable garden?