Module 2 Flashcards
Valency
the number of electrons the atom loses or gains
what is an ion
an electrically charged particle formed by the loss or gain of one or more electrons from an atom or a group of atoms
what is an isotope
atoms of the same element with the same number of protons and different numbers of neutrons
relative isotopic mass
the mass of an isotope relative to 1/12th of the mass of an atom of carbon-12
relative atomic mass
the weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12
how to calculate relative atomic mass of an element from relative abundances of its isotopes
calculate the total 1-mass of each isotope in the sample
2-add together all of these masses to give the sum of isotopic masses
3-add together the abundances to give the sum of the abundances
4-divide 2 by 3
what is Avogadro constant
number of particles per mole
6.02x10 23 mol-1
what is molar mass
mass per mole of a substance
empirical formula
simplest whole number ratio of atoms of each element present in a compound
what is molecular formula
actual number and types of atoms of each element in a molecule
stoichiometry
the molar ratio between the substances taking part in the reaction
what is the molar gas volume at RTP
24dm3 mol-1
factors that might affect the pressure of a given mass of a gas
temperature
volume
what is the ideal gas equation
PV=nRT
Pa and K
percentage yield
amount of product you actually make as a % of the amount you should theoretically make
atom economy
mass of the product you want as a % of the mass of all the products you make
how to calculate the conc. of diluted solution
divide volume of stock solution used by final volume made
multiply this by the conc. of stock solution used
what is a cation
positive ion
what is an anion
negative ion
what is an element
a substance that cannot be broken down into simpler substances by chemical means
what is a molecule
group of atoms boned together to form a compound
what is a compound
two or more different atoms bonded together
