Exam 1 prep Flashcards
What holds atoms together?
Chemical bonds
What is a particle?
A single unit of matter
What is a pure substance>
A substance made out of only one type of element
What is a molecule?
2 or more atoms combined (the same atoms)
What is a compound?
A molecule thing (2 or more atoms combined) but its with different particles
What are mixtures?
Substances with several different types of atoms
What is the formula for density?
mass/volume
What is (in this case an example of) the % abundance formula?
(# of beads of one color/total # of beads)/100
What is the SIMPLE average atomic mass (in beads)?
(mass of 1 blue bead + mass of 1 yellow bead + mass of 1 red bead)/3
What is the weighted average atomic mass (in beads)?
[(mass of 1 blue x %) + (mass of 1 yellow x %) + (mass of 1 red x %)]/100
What is the weighted average atomic mass (in beads)?
[(mass of 1 blue x %) + (mass of 1 yellow x %) + (mass of 1 red x %)]/100
What is the formula for mass number?
of protons + # of neutrons
What are isotopes?
Atoms that have the same # of protons but different #s of neutrons
What kind of charge to cations have?
Positive
What kind of charge do anions have?
negative
What happens to the atomic radius as you go across?
It decreases
What happens to the atomic radius as you go down?
It increases
What happens to ionization energy as you go down?
It goes down
What happens to ionization energy as you go across?
It increases
What happens to electronegativity as you go down?
It decreases
What happens to electronegativity as you go across?
It gets stronger
What happens when 2 atoms have very different electronegativity?
Ionic bonding happens
What happens when 2 atoms both have low electronegativity?
Metallic nonding
What happens when 2 atoms have very high electronegativity?
covalent bonding
