Model . . .Model . . .

Where have we seen the word Where have we seen the word “model” before? “model” before?

What do Scientists use models for?What do Scientists use models for?

Can models be small?Can models be small?

Large?Large? Both?Both?

Well, lets find out!Well, lets find out!

ModelsModels Today we are going to make models Today we are going to make models

usingusing atoms atoms..

WHY?WHY? Because atoms are too small to be seen with the Because atoms are too small to be seen with the naked eye!naked eye!

We are going to make models. We can We are going to make models. We can see and work with a model. This will see and work with a model. This will help us understand how atoms and help us understand how atoms and

molecules work. molecules work.

ATOMS!ATOMS!Remember that atoms are

Molecules!Molecules! Remember that Remember that

molecules are at least two molecules are at least two atoms that are connected atoms that are connected togethertogether by very strong by very strong

bonds!bonds!

Atoms Lab!Atoms Lab!• 1 gumdrop = 1 atom

• different colors = different types of atoms

• use a toothpick to connect the atoms

Models!Models! We are going to make We are going to make

some models with our some models with our gumdrops (atoms). gumdrops (atoms).

Is it important to worry Is it important to worry about the colors of the about the colors of the gumdrops? YES!gumdrops? YES!

Draw a key in your journal

KEY• Red = carbon = C So, red gumdrop = carbon atom

• Purple = oxygen = O• Green = nitrogen = N• White = hydrogen = HWhite = hydrogen = H

As soon as you’re finished writing, lay down your pencil so I know we are

ready to continue.

H20What do you get out of the faucet?

Water!

How do we know that water is a molecule?

Hydrogen + hydrogen + oxygen = water

Abbreviation, or formula = H2O

Formulas are much easier to remember & write!

We are going to make a model of a water molecule.

H20• In your journal, write the name of the molecule, the formula, and draw a picture of the molecule.

Make a Model ofMake a Model of• Pick up 2 atoms of hydrogen and Pick up 2 atoms of hydrogen and

connect them. connect them. • Ask: how many oxygen atoms will Ask: how many oxygen atoms will

we need? Connect. we need? Connect. • Hold up your water molecule for Hold up your water molecule for

me.me.• It’s okay for molecules to look It’s okay for molecules to look

different.different.

• In your journal, draw a water molecule.

• Label everything.

When you’re ready, lay your pencil down.

Record EVERYTHING in your Record EVERYTHING in your journal!journal!

• What’s in the air? Oxygen.• Oxygen molecule.

• Formula = O2

• Make a model of an oxygen molecule. Put everything in journal.

• Continue with Carbon dioxide CO2

• How many molecules total? Total Atoms? Kinds of atoms?

• Do the same for Nitrous oxide N20

DID YOU KNOW THAT . . .DID YOU KNOW THAT . . .• We know what happens when atoms

combine. Something really strange happens when we take one of the atoms off our molecule CO2.

• Carbon Dioxide becomes Carbon Monoxide! CO

• CO is a gas that can kill people! All we changed was one atom. Carbon Mono (means one) oxide is bad for us. While Co2 isn’t (at the right levels)

When Atoms Change !

• If I add an atom,

I change the molecule.

• If I take away an atom,

I change the molecule.

Molecules can be HUGE(for molecules)

Glucose is a type of sugar.It’s formula is;

C6H12O6

How many molecules?How many atoms?

Draw More molecules!

C9 HH8 8 O4

C8 8 HH9 9 N N O2

C13 13 HH18 18 O2

C14 14 HH14 14 O3