Elements, Compounds and

Mixtures

9/15/10

1. Catalyst2. Models

3. Classification Activity

MatterThe atoms and molecules that make up our

surroundings.

Chemistry is the study of matter

We need to be able to describe what it’s made of, how it works and what it looks like!

So, where are we?What we’ve learned…How to classify matter into states:

solid, liquid, gases. (the big picture)

Where we’re going…Taking a closer look – groups of atoms

and molecules

What we’re doing today

As scientists, we make decisions based upon what we observe (colors, changes, textures, etc.)

But can we see atoms?

NO!

Today we’ll be using models to examine matter and how it interacts.

Part 1: Modeling Atoms

Each group has a set of dishes filled with beads – these are our samples of matter

Each atom is represented by one bead

Each compound (groups of atoms bound together) is represented by a group of beads

Compounds and atoms are both particles. So, single beads and groups of beads are also particles in our model!

Do not open the petri dishes!

Part 2: Pure Substance vs. Mixture

Pure substance: all particles of matter are identical

Mixture: a physical blend of two or more pure substances in any proportion

Your group task: take 4 minutes to sort your petri dishes into two groups: pure substances and mixtures. Write the symbols from the petri dishes onto your worksheet according to how you grouped them.

MIXTURE PURE SUBSTANCE

ELEMENTS, COMPOUNDS, & MIXTURES ACTIVITY

SORT DISHES INTO TWO GROUPS, MIXTURES AND PURE SUBSTANCES.

Part 3: Pure substances: Elements vs. Compounds

Pure substances can be classified into two sub-categories:

Element: substances made from one type of atom

Compound: substances made from one or more types of atoms, chemically bound together

Your group task: take 4 minutes to list the pure substances you classified in Part 1, then categorize them into elements and compounds. Once you have sorted them, list the formulas from the petri dishes onto your worksheet in Part 2.

NON-MIXTURES – PURE SUBSTANCE

Elements Compounds

ELEMENTS, COMPOUNDS, & MIXTURES ACTIVITY

SORT PURE SUBSTANCE GROUP INTO TWO SUBGROUPS.

Part 4: Elements, Compounds and Mixtures

Group task: Based on the groups you just made, take 5 minutes to fill in the table in Part 3 on your worksheet with drawings of the samples and their formulas.

For example, was classified as a compound, so I would draw it in a box in the compound row of the table and write it’s symbol

MIXTURESNON-MIXTURES – PURE

SUBSTANCE

ELEMENT COMPOUND

ELEMENTS, COMPOUNDS, & MIXTURES ACTIVITY (Part 3)

Part 5: SummaryReflection: Take a minute to think about

something new that you’ve learned today.

Flow chartBased on the work we’ve done today,

create a flow diagram that organizes matter

Must include the words: Matter, elements, pure substances, compounds and mixtures

Example Flow Chart

School

Principals and Vice

Principals

Students Teachers

GirlsBoys

Matter Flow ChartMatter, Elements, Pure Substances,

Mixtures, Compounds

MATTER

PURE SUBSTANCE

MIXTURE

ELEMENT COMPOUND