Elements – More then just a weird looking car

Elements A pure substance that cannot be

separated into simpler substances by physical or chemical means

All elements are made from particles of matter

Each element only contains one type of particle

Elements cannot be changed into anything else

Identifying Elements Each element can be identified by its

unique set of properties Can use physical or chemical properties Examples: boiling point, melting point,

density, color, hardness, texture

Classifying Elements by their Properties Three main categories of elements Metals – Shiny and conduct heat energy

and electric current Nonmetals – Dull and do not conduct

heat energy or electric current Metalloids – have properties of both

metals and nonmetals

Compounds A pure substance composed of two or

more elements that are chemically combines

Involves a chemical change Each compound has its own physical

and chemical properties Compounds are new pure substances

different from the elements that make it up

Mixtures A combination of two or more

substances that are not chemically combined

No reaction or change takes place Example is a pizza. Cheese and tomato

sauce do not react when put together Each substance in a mixture keeps its

identity Mixtures involve physical changes only

Solutions A mixture that appears to be a single

substance Composed of particles of two or more

substances that are distributed evenly among each other

Process of spreading evenly is called dissolving

Solute is the substance that is dissolved Solvent is the substance in which the solute

is dissolved