CHEMQ1_ISOTOPES Flashcards
Definitions & key terms only: no solving here. Check module for isotopes further discussion
Recall the basic laws of matter and identify which law explains the following results of the experiments.
Law of conservation of mass; law of definite proportions; law of multiple proportions
Law of conservation of mass is outlined by
Antoine Laurent Lavoisier
states that in a chemical reaction, matter is neither created nor destroyed; or more accurately, there is no detectable change in mass during an ordinary chemical reaction
law of conservation of mass
It is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants
law of conservation of mass
established the second fundamental law that supports the atomic theory.
Joseph Proust
The law of definite proportions states that different samples of any pure compound contain the same elements in the same proportion by mass. In a compound, the constituent elements are always present in a _______________ by weight.
law of definite proportions
The law of ______________________ states that the mass of one element that can combine with a fixed mass of another element are in a ratio of small whole numbers.
multiple proportions
_____________(A) is the total number of neutrons and protons present in the nucleus of an atom of an element
mass number
(Z) is the total number of protons in the nucleus of each atom of an element. These two can be used to give an information on isotopes.
atomic number
A
mass number
Z
atomic number
are atoms of the same element but have different mass numbers
isotopes
