3-1 Heterogeneous materials
	Material refers to a specific kind of matter
	A heterogeneous material is not uniform throughout
	A phase is a physically separate part of material having a
	uniform set of properties Heterogeneous materials contain
	more than one phase and is always a mixture can be separated
	by physical means boundaries of phases are called-interfaces
	a mixture is a combination of 2 or more substances that retain
	their individual properties

3-2 Homogeneous Materials
	Homogeneous materials consist of only one phase
	Homogeneous matter composed of more than one material is called
	a solution
	Solute-dissolved material/ solvent-dissolving material-one in
	larger proportion
	solutions may be solids, liquids, or gases
	Molarity, M, indicates the amount of solute in a specific amount
	of solution

3-3 Substances
	an element is composed of only one kind of atom
	a compound is made of more than one kind of atom and are present
	in definite ratios
	88 natural elements
	substances can be classified as organic(contain carbon) or
	inorganic(non carbon containing)

3-4 Physical and Chemical Change
	physical changes only affect physical properties-nothing new formed
	chemical change produces new substances with new properties
	must be used to separate the elements in a compound
	distillation is a means of separating substances by Bp
	a change of state  is a physical change(solid,liquid, gas)

3-5 Physical and Chemical Properties
	physical properties describe how something looks or acts in a 
	physical change
	Extensive properties-amount of matter present(ex mass 
	length)
	intensive properties do not depend on the amount of matter
	ex. ductility,melting point
	chemical properties describes behavior during a chemical change

3-6 Energy Transfer
	A system is a part of universe under consideration
	Heat is the energy transferred between two objects because of a
	temperature difference- represented by "q" and measured in
	joules(J)-also measured in calories(cal) 1cal=4.18 J
	Food calories (C) = 1000 chemical calories

3-7 Measuring Energy Changes
	A calorimeter is used to measure energy changes in chemical reactions
	Specific heat, Cp, is heat needed to raise the temperature of 
	1 gram of substance 1 deg C  Unit J/g C. every substance
	has its own Cp
	Law of conservation Hl=Hg
	q=cm delta t
	Cp of solids nd liquids are nearly constant over a temperature
	range
	Cp of gases vary with temperature
	the Cp of water is 4.18 j/gC

Chapter 3 Class Notes
	Phases-Interphases
	Heterogeneous 
	Mixtures
	Homogeneous
	Solution-Solute-Solvent	
	Molarity(M)
	Element-Compound
	Organic-Inorganic
	Physical/Chemical change
	Heat(Q)/Calories/joules(we use joules in here instead of calories
	Specific heat water=4.18 j/g C(MEMORIZE THIS NUMBER)
	Q=cm DELTA T(MEMORIZE)
	HEAT LOST = HEAT GAINED Ql=Qg(MEMORIZE)