Question | Answer |
Atom | basic building block of matter and consists of 3 basic particles (protons, neutrons, electrons) |
Elements | pure substances that cannot be changed into simpler substances and are composed of one kind of atom |
Compounds | pure substances that are composed of two or more types of elements that are chemically combined and can only be changed into elements through chemical changes |
Mixtures | two or more substances physically combined; easy to separate. |
Heterogeneous mixtures | are not uniform and the component substances can be visibly distinguished |
Homogeneous mixtures | are uniform throughout and the substances are evenly mixed and cannot be visibly distinguished. |
Conductivity | The ability of a substance to move electrons |
Reactivity | The potential for 2 or more atoms to chemically combine |
Metals | are conductors that are strong, shiny, hard and malleable. |
Nonmetals | are gasses or solids and are not good conductors. They are brittle. |
Metalloids | An element that has properties of both metals and nonmetals |
Period Table | An arrangement of the elements according to properties and structure |
Solubility | The ability of a substance to be dissolved into another substance |
Density | Mass per unit volume; crowdedness; d= m/v; |
melting point | The temperature when a solid changes to a liquid |
boiling point | The temperature when a liquid changes to a gas |
Law of Conservation of Mass | matter cannot be created nor destroyed |