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science
science test C68
Term | Definition |
---|---|
physical change | something that changes it's size, shape or state of material |
chemical change | is any change in which new substances are formed |
model | is a way to represent an object or describe how a process takes place |
nucleus | most of an atom's mass is contained in a central core |
proton | particle that has a positive electric charge |
neutron | particle that has no electric charge |
elctron | particle that has negative electric charge |
atomic number | number of protons in an atom of that element |
ion | electrically charged atom |
radioactive element | made up of atoms whose nuclei is broke down or decay into other atoms |
nuclear fission | splitting nuclei |
indicator | substance that changes color when mised with acid or base |
neutralization | reaction between acid and base |
salt | is a compound that can be formed when an acid reacts with a base |
polymer | proteins is an organic compound that contains a very loing chain of carbon compounds |