HONORS CHEMISTRY August 23, 2011

Brain Teaser PLACE HOMEWORK ON YOUR DESK  Classify each of the following as a physical or chemical property. a. Iron and oxygen form rust. b. Iron is more dense than aluminum. c. Magnesium burns brightly when ignited. d. Oil and water do not mix. e. Mercury melts at -39 degree Celsius.

Agenda  Brain Teaser  Grade Worksheet  Notes: Classification of Matter and Separation Techniques  Homework  Study for Element Quiz on Wednesday/Thursday (40 Elements)  PowerPoint Presentation

Classification of Matter Matter Pure Substance ElementCompound Mixture HeterogeneousHomogeneous

Classification of Matter

Pure Substance Elements  Matter that can not be broken down into simpler substances under normal lab conditions  Contains only one kind of atom AtomMolecule  Elements (symbols) Na, Au, C  Where can you find a list of all the elements?

Pure Substance Compounds  Can be separated into elements  Composed of two or more elements that combine in a chemical reaction  Combine in a fixed proportion  Examples – NaCl, H 2 O, Fe(NO 3 ) 3 + +

Which are elements and which are compounds?

Mixtures  A blend of two or more pure substances  Not chemically combined  Composition of mixtures is variable Granite

Mixtures Heterogeneous  Mixture with visibly different parts.  A heterogeneous mixture is one that does not blend smoothly throughout and in which the individual substances remain distinct.  Sand + water  Salt + Pepper  M & M’s

Mixtures Homogeneous  Mixture with no visibly different parts.  Sea water H 2 O + NaCl  Air N 2 + O 2 + CO 2

Practice Classifying Matter  Make a list of 3 things (and their parts) found in the classroom. Classify these as  solid, liquid, or gas  pure substances and mixtures  homogeneous or heterogeneous  elements or compounds  Be prepared to share your classifications?

Classify  mixtures  pure substances  elements  compounds Draw a picture that represents a pure compound.

Classify Classify each of the following as, a homogenous or heterogeneous mixture, pure substance, element or compound, atom or molecule. 1. CH 4 2. KMnO 4 3. Co 4. Al + H 2 O Draw atomic level pictures of each substance.

Review Questions Identify each of the following as an example of a homogeneous mixture or a heterogeneous mixture. A. a pile of rusty iron filings B. 70% isopropyl rubbing alcohol C. Saltwater D. Gasoline

Review Questions Identify each of the following as an example of an element or a compound. A. sucrose (table sugar) B. the helium in a balloon C. baking soda D. a diamond

SEPARATION OF MIXTURES

Separation of Mixtures No Chemical Change  Heterogeneous  Filtration  Seperate by size or state of matter

Separation of Mixtures  Homogeneous  Distillation  Using Different Boiling points  Crystallization  Evaporation or cooling with a solid left behind  Chromatography  Solution flows along a stationary substance

Filteration  Filtration is a technique that uses a porous barrier to separate a solid from a liquid.

Distillation When precisely controlled, distillation can separate substances having boiling points that differ by only a few degrees

Evaporation/Crystallization Crystallization is a separation technique that results in the formation of pure solid particles of a substance from a solution containing the dissolved substance.

Chromotography

The separation occurs because the various components of the ink spread through the paper at different rates. Chromotography

Closure  Draw an atomic level picture of a mixture of compounds.

Homework  Finish PowerPoint Presentation  Element Quiz (Wednesday/Thursday) – 1- 40