chem quiz #1 Flashcards
(13 cards)
atomic mass unit ( amu ) is equal to
to the mass of a proton or neutron
what is amu based on
one twelfth the mass of a carbon-12 atom
a compound that contains more than one of a particular polyatomic ion needs
parenthesis
what don’t you need to calculate the atomic mass of an element based on isotope abundances
the number of neutrons in each isotope
true or false: prefixes are used when naming ionic compounds
why do covalent compounds use prefixes when naming
to indicate the number of atoms of each element in the compound
which group of the periodic table contains the most diatomic elements
halogens
molecular mass
the mass of a single molecule of a substance
what is the difference between cation and anion
cation has positively charged ions
anion has negatively charged ions
why do transition metals form multiple ions with different charges, and how does this affect their naming in ionic compounds
because they have multiple valence electrons causing them to use roman numerals
what is the general role for predicting the charge of an ion based on its position in the periodic table
group 1: +1
group 2: +2
group 13: +3
group 14: +4/-4
group 15: -3
group 16: -2
group 17: -1
why do some elements like oxygen and nitrogen exist as diatomic molecules
because they cannot exist my itself
