Chemical Groups
a substance that is made up of the same type of atoms
what is a CHEMICAL ELEMENT?
a pure substance that is made up of two or more different elements in Fixed proportions
a chemical compound
compounds that are made up of a metal and nonmetal element create
crystals
the mass of one atom of an element is called
atomic mass
mass(g) / molar mass(g/mol)
moles
these gases have a full valence shell so they are stable
many non-metallic compounds form this type of bond
covalent bond
this type of crystal is formed by a metal and a non-metla
ionic crystals
the average of its isotopes, weighted by their proportion in nature
relative atomic mass
one mole is how many particles
6.022 x 10^23 particles/mol
two atoms of the same elements combined
diatomic molecules
what type of bond is in H20
covalent
this type of crystal is fromed by two non-metals
covalent crystals
what instrument can be used to measure atomic mass
mass spectrometer
what is the molar mass of H2O?
18g
In a diamond crystal, each atom shares ___ electrons
four
what are the two types of bonds?
covalent and ionic
true or false:ionic crystals are highly soluble in water
ture
the atomic mass of helium is 4u. Convert to Kilograms. amu(u) = 1.66 x 10^(-27)
6.64 x 10^-27 kg
the mass of one mole of atoms
molar mass
In a graphite crystal, each atoms shares __ electrons, forming layers
three
the charges are not symmetrically distributed. This creates ______
polarity
true or false, covalent crystals have high melting and boiling points
true
the fixed proportion between the atoms of its elements
percentage composition
true or false, molar mass can be expressed as kg/mol
true