Part 1

Elements

Key concepts:

• Describe a pure substance.• What are some characteristics of elements?• List examples of characteristics of elements.• How do we use these characteristics to classify

elements?• What is the difference between an atom and

an element?

Key Vocabulary:

• Element• Particle• Pure substance• Metal • Non-metal• Metalloid

Imagine a world of legos:

Element:• An element is a pure substance that

cannot be broken down into a simpler substance by physical or chemical means.

• All elements are PURE! – Means…a substance that is made of one

type of particle

– ON Periodic Table: shown as only having 1 capital letter:• O for oxygen; C for carbon; Ca for calcium

– This particle is called an ___________• ATOM!

What does pure mean?

What are some examples of chemical and physical changes?

What is an atom? Where have we seen this before?

SAY WHAT!

• What do you already know about atoms and elements???– Write on the post-it note on your desk. List 3

things that you already know.– What do you know?

Review time!

• Draw this please!

Element:

• When we say PURE…– ANYWHERE else that you see that

element, it will be EXACTLY the same • Same properties• Same number of electrons, protons,

and neutrons

• How does an element differ from other pure substances (like compounds)?

What if the element is found in space?

What are some properties of elements?

Pure vs. Unpure:

Properties of Elements:

• We can identify elements by its properties:– Each has its own special

characteristics• NOTE: these properties DO NOT depend

on the amount

– Include:• Physical properties

– Density

• Chemical properties• Reactivity—what’s this?

What are some characteristics that make you..you?

What are some properties?--boiling point--able to burn--state of matter

Properties:

Compare the properties of iron with those of cobalt and nickel. How do you think cobalt and nickel are used to make products?

• Color• Hardness• Texture• Flammability• What else?

Properties used to distinguish elements:

• Reactivity to acids, water, etc.

• Density• Conductivity• Malleability• Ductile• Luster• State of matter• Boiling points

Classifying Elements:

• How could we classify this class?– What does classify mean?• ?

– Volunteers?– What properties make us different?

Similar?

What are some characteristics that make you..you?

What does classify mean?

Classifying Elements 2:

• Elements are grouped into categories by their similar properties:

-What are some characteristics that make you..you?

-What does classify mean?Refer to page 237!-Which are good conductors?

On page 237:

Review:

• What is an element?• What does it mean to be pure?• How are elements different from other

materials?• How are elements classified?

Periodic Table:

Pearls of Wisdom:

•A substance in which all of the particles are alike is a pure substance.

•An element is a pure substance that cannot be broken down into anything simpler by physical or chemical means.

•Each element has a unique set of physical and chemical properties.

•Elements are classified as metals, nonmetals, or metalloids, based on their properties.

Homework:

• Vocabulary cards for the following term:– ELEMENT

• Questions on page 237: Write the ?– Do this on the back of your notes:– # 4, 5, 6, and 7