CLASSIFYING MATTER

Vocabulary & People

Pure Mixture Compound

Molecule Diatomic

Heterogeneous Homogeneous

Formula Subscript Coefficient

S1-2-09 Compare elements to compounds.

S1-2-10 Interpret chemical formulas of elements and compounds in terms of the number of atoms of each element.

Matter: Anything that has mass and takes up space, or

volume.

Mixture Substance contains more than one kind

of particle.

PureEvery particle that

makes up a substance is the SAME.

PURE1. Elements• Simplest form matter• Smallest particle of an element - atom

2. Compounds• Two or more elements chemically bonded• Smallest particle of an element – molecule

A bucket of gold atoms (Au) and a bucket of water molecules

(H2O) are both PURE since in both cases there is only ONE

type of particle

Element:Sodium – all pure sodium atoms

It’s possible to have compounds of the same atoms:• Called diatomic (two atoms) molecules

Oxygen gas – O2 Hydrogen gas – H2

Compound:Salt – all pure sodium chloride molecules

Heterogeneous• Particles are not evenly distributed• Particles can be separated physically

Sand and waterPizzaBubble tea

Homogeneous· Particles are evenly distributed – “solution”· Cannot physically separate different particles

Salt and waterCokeCheese

subscript

Chemical Formula• Shows type and amount of each atom present in a

compound

HOH

HH

O+

and 3 atoms of oxygen

H2O3

form 3 molecules of water.6 atoms (3 x 2) of hydrogen

HH

OH

H

O

HH

O

coefficient

Subscripts – how many atoms (of an element) in a compound

Coefficient – how many molecules present

1

Compound Coefficient Total of each element

KHCO3 1 K – 1 H – 1 C – 1 O – 3

AlCl3 3 Al – 3 Cl – 9

CBr4 6 C – 6 Br – 24

H2SO4 5 H – 10 S – 5 O – 20

C11H22O12 4 C – 44 H – 88 O – 48

1

3

6

5

4

1000 kg 1000 kg

Law of Conservation of Matter:

In any chemical reaction matter cannot be created or destroyed.

Atoms will rearrange to form new compounds, but the number and type of atoms will not change during the reaction

Vocabulary & PeoplePure Mixture

Compound Molecule Diatomic

Heterogeneous Homogeneous

Formula Subscript Coefficient

CAN YOU ANSWER THESE QUESTIONS?

S1-2-09How do you classify matter using the words: element, compound, atom, molecule, mixture and pure?

S1-2-10How do you use a formula to find the elements in the molecule and the number of atoms of each element?