Question | Answer |
Atom | Smallest "building block" of life. Basic unit. Like ones make up elements. |
Element | Cannot be separated into different parts. Atoms with same atomic #, mass, and #s of protons, neutrons, and electrons. |
Compound | Composed of 2 or more elements ionically bonded. 1 metal. |
homogeneous mixture | multiple substances, but uniformly spread throughout. in a pattern |
heterogeneous mixture | substances are not evenly dispersed throughout. distinct regions. |
pure substance | constant composition. element, compound, molecule. |
colloid | has medium sized particles that never settle out. reflect light. |
solution | liquid containing another substance dissolved into it |
suspension | the state in which the particles of a substance are mixed with a fluid but are undissolved. |
physical change | change that you can observe with the senses. NO changes in composition. |
chemical change | change having to do with chemical reaction, unexpected change in color, temperature. NON REVERSIBLE. |
Chemical equation | a representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product |
chemical formulas | a representation of a substance using chemical symbols for its constituent elements
H(2) O |
chemical symbol | an abbreviation or short representation of a chemical element; the symbols in the periodic table. Always composed of an uppercase letter sometimes followed by a lowercase. (Li, H, O, etc.) |
conservation of matter | the principle that matter cannot be created or destroyed. |