chem cht. 1

atom

subatomic particle that are the building blocks of ordinary matter.

matter

anything occupying space and has mass

molecule

specific geometric arrangement of atoms

chemistry

science of understanding the behavior of matter through studying atom and molecule behavior.

hypothesis

tentative interpretation of observations

experiment

highly controlled procedure to generate observations that confirm or refute hypothesis

scientific law

brief statement summarizing past observations and predicts future ones

(whats going to happen)

Scientific theory

still taking past observations and trying to explain why its going to happen

(why it happens)

substance

specific instance of matter

state

physical form of matter (solid, liquid, gas, plasma)

composition

whats making up the matter

solids

• definite shape and volume

• particles are close together/compact

liquids

• definite volume but not shape

• particles are a little more spread apart

gas

• no definite shape or volume

• particles are very spread out

variable composition

multipole instances of matter

homogenous mixture

two or more components uniform distribution

heterogenous mixture

two or more components that are not uniform distribution

decanting

pouring off liquid from a solid

volatile

go from liquid to gas easily (liquid perfume)

physical property

a property that a substance displays without changing its composition

physical change

change that only alters appearance but not composition

chemical property

property a substance displays only changing its composition

chemical change

a change that alters the composition of matter

energy

capacity to do work

work

action of force through distance

kinetic energy

energy associated with motion

potential energy

energy associated with its position or composition

law of conservation of energy

energy is neither created nor destroyed

length

sl unit- meter (m)

mass

sl unit- kilogram (kg)

time

sl unit- second (s)

temperature

kelvin (K)