How can a substance be made amorphous?

Name the three methods by which hydrous substances can be made anhydrous.

By using Ag^+,Cl^-,Na^+,OH^- How many substance can be formed?

As density .................. (changes/does not change), it can be used to identify what a substance is made of.

______is the property of the substance which shows how easily a substance can be magnetised.

How can a chemical equation be made more informative ?