HELP

IDENTIFY THE ELEMENT WHICH HAS A GREATER ATOMIC MASS FLOURINE OR CLOURINE

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

What is calcium oxide+diphosphorus pentoxide--> calcium phosphate balanced

Ajar contains a certain substance. which observation would show that the substance must be either a solid or a liquid?