section 1 Principles of chemistry part 2 Flashcards
what are isotopes?
Different atomic forms of the same element
With the same number of protons
But different number of neutrons
what is the equation for relative atomic mass?
(rel. mass x rel. abundance of isotope 1) + (rel. mass x rel. abundance of isotope 2) / the sum of the rel. abundances
what is the relative formula mass of H2O?
2 + 16 = 18
what is the empirical formula?
smallest whole number ratio of atoms in a compound
what is the molecular formula?
actual number of atoms in a compound
what is Avogadro constant?
moles 6.023x10(23)
whats the equation for number of moles?
mass in g divided by the relative formula mass
what is a solid salt containing water of crystallization?
hydrated
what is an anhydrous salt?
a salt without water of crystallization
what are the 2 equations to find volume using mole?
volume = moles of gas x 24 volume = (mas of gas/ relative formula mass) x100
what is concentration measured in?
moles per dm3
what is the equation for concentration?
number of moles/volume
electric current is ………………………
A flow of electrons or ions
when do ionic compounds conduct?why?
molten or in solution
electrons free to move
do covalent compounds conduct electricity?
no
why are metals good conductors?
they have a sea of delocalised electrons to carry an electrical current