general Flashcards
which number is which when you look at an element on the periodic table
bigger number is always relative atomic mass (no of protons + neutrons of each isotope of an element added together and divided by how many isotopes there are)
smaller number is always atomic/proton number. just basically the number of protons
just remember smaller number is protons because it will obviously be smaller than proton plus neutrons which is what the mass number is
what is AR
relative atomic mass (weighted mean mass)
work out by doing (mass1xabundance1) +(mass2xabundance2) divided by 100 if abundance is percentages but divided by total of abundances if not percentage
what are all elements a mixture off
they are a mixture of isotopes
what sub-atomic particle do chemical reactions involve
they involve the electrons in the atoms
do isotopes react in the same way
yes as they have the same electrons
which isotope is chosen to be the base for all other atoms to compare to
carbon-12.
so carbon 12 has 12 mass units
so a singular mass unit would be 1/12
so the unit we measure atomic mass in is compared to the mass of 1/12 carbon 12
what is the difference between iron(II) and iron(III)
the bracket just shows the charge of the ion it forms
iron(II)= fe2+
iron(III)=fe3+
the compound ends in ide
how many elements are in it
two elements
it is a binary element
when do you use -ide and when do you use -ate
-ide binary compound two elements
-ate more than two elements make up compound
is molar mass and Mr the same number
yh
what do we change the name ending of a non-metal ion in a binary compound
-ide fluorine forms a fluoride ion
what is a molecular formula
tells us the No. of molecules in the compound
l
what is the amount of a substance
how many moles it is
what is molar mass
the mass of one mole
has the same number as relative atomic mass
