describes a substance, not how substance changes
physical property
different throughout (italian dressing)
heterogeneous mixture
smallest unit of element that has properties of that element
atom
length-meter, mass-gram, temperature-kelvin, time-second, amount of substance-mole
SI base units
pure substance made of only 1 kind of atom
element
energy is never created or destroyed in any reaction
law of conservation of energy
1. has mass 2. has volume
properties of matter
must be calculated (volume, concentration, area, density, energy, molar mass)
derived SI units
weight involves gravity pulling down
how is mass different from weight?
extensive and intensive
2 types of properties
same throughout (salt water)
homogeneous mixture
measure of amount of matter
mass
depends on amount of matter present
extensive property
pure substance made from atoms of 2 or more elements
compound
substance changes into a different substance
chemical change
does not depend on amount of matter present
intensive property
vertical columns
groups/families
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