topic 1 Flashcards
Define atom?
the smallest unit of an element that retains its chemical properties
Define element?
a pure substance made of only one type of atom
Define ion?
a charged particle formed when an atom gains or loses an electron
define molecule?
two or more atoms chemically bonded together
define compound?
A substance made of two or more elements chemically bonded
define empirical formula?
simplest ratio of atoms
define molecular formula?
actual number of atoms
what is avogadros constats number?
6.02 x 10 to the power 23
how do you calculate mole?
mass/molar mass
define relative atomic mass?
the weighted mean of an atom of an element compared to 1/12 the mass of an atom of carbon-12
define relative isotopic mass?
the mass of an atom of an isotope of an element compared to 1/12 of the atom of carbon-12
How do you write an ionic equation?
1) split up the aq into ions
2) Remove unchanged ions
how do you calculate parts per million?
mass of solute/mass of solution
x 1000000
how do you calculate concentration?
moles/volume
what is the ideal gas equation?
pV = nRT
p= preassure (pa)
v= volume (m3)
n= moles
r= 8.31
t= temperature (k)
How do you calculate percentage yield?
actual mass / theoretical mass
x 100
How do you calculate atom economy?
mass of desired product / total mass of reactant
x 100
What is a displacement reaction?
a more reactive element displaces a less reactive element
