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

Can you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?

What is a vermiform appendix?

Name a method used to separate two miscible liquids.

What are double salts? Give an example?

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

HCl +? \rightarrow NaCl + H _2 O

Pick out the odd one.

What factors are required for the absorption of Vitamin D from the food by the body?

Ice is kept in a double-walled container. Why?

List the respiratory organs of amphibians.