Models provide and can help for your observations. they help scientists accounts for known facts. it must also enable scientists to make testable predictions.
What is the purpose of lab 8.2 "a black box"
Black box resembles an atom. we cannot actually see what is in an atom but can manipulate one to find it's properties. the black box hhelps you to test your predictions.
What is the function of "Rings and Fasteners"
Rings and fasteners are models used to describe the atomic model of matter all atoms of one element are alike but are different from the atoms of another element. rings and fasteners represent different elements and can show you how elements combine to form compounds. these compounds can be related to the law of constant proportions and conservation of mass
Define synthesis and decomposition?
Synthesis= a new substance by combining 2 or more elements/compounds
Decomposition= A complex substance breaks down into 2 or more simpler substances
Define constant proportions?
when two substances combine to form a compound they always combine in a constant proportion. the ratio of the masses that reacts remains constant, no matter how much of the substances are mixed.
Gas- pairs of atoms are far apart from each other
Liquid- Pairs of atoms are closer together. It may be hard to tell which atom of A attached to atom B
Solid- Pairs of atoms are packed closely together. it is impossible to determine which atom of A is attached to atom B