5 Written questions
4 Multiple choice questions
- a charged atom or molecule; an atom or molecule that has either an excess of electrons (and hence is negatively charged) or has lost electrons (and is positively charged).
- a liquid capable of dissolving (uniformly dispersing) other substances in itself.
- a subatomic particle that is found in the nuclei of atoms, bears no charge, and has a mass approximately equal to that of a proton.
- a chemical bond formed by the electrical attraction between positively and negatively charged ions.
4 True/False questions
proton → a subatomic particle that is found in the nuclei of atoms, bears a unit of positive charge, and has a relatively large mass, roughly equal to the mass of the neutron.
pH scale → a particle composed of one or more atoms held together by chemical bonds; the smallest particle of a compound that displays all the properties of that compound.
element → a liquid capable of dissolving (uniformly dispersing) other substances in itself.
electron shell → a region within which electrons orbit that corresponds to a fixed energy level at a given distance from the atomic nucleus of an atom.