Do now

• Turn in 1 cm3= 1 ml lab• Take out your homework (graphic organizer)• And put everything else away…• Homework Check; You can use your

homework on it

Tonight’s Homework

• Finish Matter homework• Finish Safety Lab from Friday

Figure out what makes the 2 columns different and then classify the bottom terms

• Water• Iron• Sugar

• Gatorade• Sugar Water• Salad

• What about; Aluminum, cereal, coffee, oxygen

Whats my rule?

• Mud• Garbage• Chocolate chip

cookie dough

• Salt water• Kool-aid• Tap water

• What about: Iced Tea, a bag of skittles

Whats my rule?

• Sugar (C6H12O6)

• CuSO4

• Water

• Iron• Hydrogren• Helium

• What about: FeO, Mercury

Today’s Focus

•What is Chemistry?

MATTER!!!

• Chemistry is all about the study of matter

• Matter is simply anything that has a definite mass and volume.

Hmm….

• Is there anything in this room that would be considered matter?

Substances

• Are types of pure (homogeneous) matter– containing the same composition of material

throughout the sample• Cant distinguish different parts• Which is a substance?

Substances; Elements

• Elements cannot be decomposed by chemical change.

• They are made up of 1 type of atom• Symbols are either 1 capital letter or 2 letters,

the first of which is capitalize– O, N, C, Ni, Fe, Li, Xe.

Substances; Elements

Substances; Elements

• Atoms are The smallest part of an element that still retains the properties of that element.

• The basic building block• CAN NOT BE BROKEN DOWN

(without changing its properties).

Substances; Elements; Atoms

• Made up of protons and neutrons on the inside and electrons on the outside

• Inside is called the nucleus• Outside has energy levels where the electrons

are found.

Substances; Compounds

• Compounds are pure substances that are a combination of 2 or more atoms of different elements bonded together chemically

• CAN BE BROKEN DOWN into separate elements.– 2 H2O 2 H2 + O2

Whats my rule

• K• Al• Kr

• SrS• MnO2

• HCN

What about; Na2SO4, Mn

Mixtures

• Physically combined• Example: C6H12O6 (sugar) + water C6H12O6

(sugar) + water • They are combined, but the sugar doesn’t

chemically react with the water. • the sugar is still sugar, and the water is still

water…

Mixture Dot Diagram

• See how we have 2 different things mixed together

• Red and blue are bound together (compound) and yellow (element) is mixed with it

Mixtures: Homogenous

• Remember, homogeneous means that it is uniform throughout the mixture.– Cant distinguish one part from

another.

Mixtures; Homogeneous

• Aqueous solution: Water + stuff• Tincture: Alcohol + stuff• Amalgam: Mercury + stuff• Alloys: Mixture of 2 metals.

Mixtures; Heterogeneous

• Variable composition throughout the sample• Examples:– Italian Salad dressing– Soil

• When looking at these things it is easy to see the varied composition.

You tell me; Homogeneous or Heterogeneous

• Salad• Ocean water• Cereal and milk• Cream corn (yum)• Coffee

You tell me; Substance or Mixture

• H2O

• H2O + salt• Al• N2

• Hot chocolate (with mini-marshmallows of course)

Illustrating Types of Matter; Dot Diagrams

• Each dot represents a single atom. • Different types of dots are different types of

elements• Ex; Different phases of the same element:

Solid Liquid Gas

• What are these dot diagrams for?• Element

• Diatomic Molecule (not a compound since its only 1 type of atom)

• Compound (2 different elements bonded together)

• Heterogeneous Mixture

• Homogeneous Mixture

Sorting Practice

• Around the room are boxes with stuff• The box is divided into 4 sections;– Homogeneous mixture, heterogeneous mixture,

substance and element• You will classify the stuff and record your

answers on the graphic organizer• 7 minutes

Changes of Matter

• They can either be physical or chemical• Physical: Doesn’t Change the Identity of the

matter, just its form• Chemical: changes the identity of the matter

You tell me; Physical or Chemical?

• The paint has worn away, so the steel body of an old car begins to rust (rust forms when iron reacts with oxygen…)– Chemical

• Potassium thiocyanate crystals dissolve easily into water.– Phyiscal

You tell me; Physical or Chemical?

• A 10.0 g sample of lauric acid can be melted by adding heat.– Physical

• Sodium metal explosively reacts with water to form hydrogen gas and sodium hydroxide.– Chemical

Physical Changes

• Melting• Boiling• Dissolving• Evaporating• Crushing• Stretching• Changing its shape

Chemical changes

• Rusting (Iron reacting with oxygen)• Burning (Reacting with Oxygen)• Decomposing (Breaking bonds)– 2 H2O 2 H2 + O2

• Reacting with…• X + Y XY A new compound was made!

Chemical Change

Look on the graphic organizer

• #1 and #2 have to do with types of change• Write in what type of change (physical or

chemical) belongs in each space• Check that your name is on them and pass

them to the left

Rest of the period:

• Take out the homework packet and work on the matter homework

Homework for tonight:• Finish the matter homework and the Safety

Lab from Friday