unit #1
describe mass
the amount of partials in something
What's an anion?
A negatively charged ion
what is another name for a pure substance?
an element or compound
why do electrons like to have the lowest possible energy?
because low energy systems are more stable than high energy
what is the law of conservation of mass
in a closed system matter cant be created or destroyed in a reaction
describe volume
the amount of space something takes up
What makes an atom charged?
amount of electrons
what happens to white light when it is shined through a prism?
it splits into colors
why is it possible to get larger angles separating electron pairs in 3 dimension versus two dimension?
with 3 dimension you have more space
use the cris cross meathod to determan the correct chemical equation of Calcium Bromide
CaBr2
describe density
the amount of partials in an amount of space
What is an isotope
When an atom has more or less neutrons than protons
which wavelength has more energy, red or blue?
blue
what are atomic radius units?
picco meters
name this compound CoBr2 and determan what time of bond it has
Cobalt Bromide is ionic
how many milligrams are in a gram?
1000
What does Couloumb's law show?
Calculates force between to charged objects at a distance
when an electron moves from a close energy level to a far energy level, does it gain or lose energy
it gains energy
why do you need the arrows to go in opposite directions to fill out electron orbitals?
because it represents opposite charges and like charges repel so you can not put them in the same orbital
name the compound PbO2
Lead(IV) oxide
are leading 0's sig figs?
no
What causes lighting?
Friction in clouds cause it to get partially charged, which polarizes the ground which causes lightning
how do electrons releasing energy tell us what element its from?
different elements release different colors of light
why would a 2p orbital have more energy than a 2d orital?
because the energy sub levels have different energy's
balence this equation C7 H16 + O2 yelds CO2 +H2O and name the tipe of reaction
1, 11, 7, 8, it is combustion