This definition and interpretation is generally considered sufficient for school-level, incl GCSE Chemistry. There are, however, some other definitions e.g. "A form of matter that has both definite composition and distinct properties. A pure substance cannot be separated into simpler components withou...
If asked "What is an isotope ?" in GCSE Chemistry, a more detailed answer is required using one of the definitions below: Definitions of an isotope: Isotopesare atoms of thesameelementthat have thesamenumber of protons butdifferentnumbers of neutrons. ...
What are the sites of protein synthesis? Which process is the first step of protein synthesis? What kind of molecules has the instructions for protein synthesis? What is the energy source for protein synthesis? What do ribosomes do in protein synthesis?
This one underlying principle unifies the reasons why (i) molecules form, (ii) metals are hard, solid objects, (iii) you don't fall through the floor. The details, however, vary from one kind of material to another. I'm not too fond of the explanation provided by Zz's link. I rec...
These different types of mixtures are interesting but might not be essential knowledge for GCSE Chemistry. The descriptions are non-technical (omitting details, e.g. of particle sizes), but sufficient for general comparison. Thesubstancesof which a mixture is formed can sometimes be identified visua...
This description makes more sense the more chemistry you have studied because a large aspect of the study of chemistry concerns learning about how, why and when certain substances, all of which are made-up of atoms or of atoms that have joined together to form molecules, change in structure ...
It is important to know aboutprotons(for school level, e.g. GCSE Chemistry) because protons are important for several key topics necessary for the understanding of basic chemistry. These topics include thestructure of atoms,isotopesandrelative atomic mass. ...