Elements, Compounds, and Mixtures Chapter 3 Elements, Compounds, and Mixtures

Think About It? Can all substances or objects be “broken down”? Explain your answer.

An element is… A pure substance that cannot be broken down by physical or chemical means.

A pure substance is… A substance that is made of only one kind of particle

Which of these is a PURE SUBSTANCE?

A characteristic property… Can identify a substance DO NOT depend on the amount of the substance

Examples of Characteristic Properties… Boiling Point Melting Point Density Reactivity with acid

Look at the characteristic properties Look at the characteristic properties. How are these substances different?

Metal, Nonmetal or Metalloid? All elements can be separated into these 3 major categories How do we put all objects into these main groups?

Metals Shiny Can conduct heat and electricity They can be formed into sheets and wire Examples: tin, gold, copper

Nonmetals Dull (non-shiny) POOR conductors of heat and electricity Solids are brittle (break easily) Examples: iodine, sulfur, neon

Metalloids These can have properties of BOTH metals and nonmetals

Homework Page 59 #1,2,3,5,6,7