particle theory and states
solid, liquid, gas
is melting ice a chemical or physical change
it is physical
what is the name of a particle in a atom with a positive charge
the proton
what charge does a neutron have
none
name the compound NaCI
sodium chloride
what is the change called when solid turns to liquid.
melting
name one sign of a chemical change
new substance formed, e.g., gas, color change, heat/light, etc.
what is the name of the element that is represented as O on the periodic table
oxygen
how many electrons are in the first shell of an atom
2
what type of elements form ionic compounds
metals and non metals
what is the difference between a pure substance and a mixture
pure substance = 1 type of particle
mixture = 2 or more types
is iron rusting a chemical change
yes
what does H₂O stand for
2 hydrogen 1 oxygen
what are 3 parts of an atoms
protons, electrons, neutrons
name this coumpound NaHCO3
sodium bicarbonate (baking soda)
what is all matter made up of
matter is all made up of particles
key difference between chemical and physical change?
chemical makes a new substance physical does not
what does CO₂ stand for
1 carbon dioxide 2 oxygen
what small particals are the furthest when moving around the nucleas
electrons
name the difference between ionic and covalent compounds
ionic is electron transfer
covalent is electron sharing