Chemistry Unit 1 Chapter 1, 2, & 5

Class Supplies Notebook (lecture / discussion / notes) Scientific Calculator 3-ring binder or folder for each unit

1.1 Chemistry Why study Chemistry? –Problem Solving What is Chemistry? –The study of matter (stuff) and the changes it undergoes (reactions - chemical changes) Macroscopic vs. Microscopic ??

Steps of Scientific Method Experimental variables ? What does experiment do? Scientific Theory vs. Law?

Experiment parts Independent variable (manipulated) Dependent variable (responding) Constant (all other “variables”) Control group Experimental group

Chapter 5 - Measurements Review these topics Scientific Notation SI measurement system –units –prefixes –uncertainty and significant figures –temperature - only worry about C K –density - derived unit Accuracy vs. Precision Conversion factors

Chapter 2 - Matter - what is it? Matter - Something that has mass & takes up space Mass vs Weight Physical Property - a quality of condition that can be measured or observed without changing the composition - Name some? Physical change - a change that doesn’t change the substance

States of Matter visual motion GAS SOLID LIQUID Condensation Evaporation Vaporization Boiling melting Freezing Deposition Sublimation

Definite or Indefinite SolidLiquidGas ShapeDefiniteIndefinite VolumeDefinite Indefinite

Matter Definitions Element Compound Substance 1 type of atom 2 or more types of atoms - chemically combined - has a chemical formula Matter with uniform composition - elements or compounds

Matter Definitions Mixture –Homogeneous –Heterogeneous Mixtures can be separated by using any difference in substance’s physical properties Special types of Separations –Filtration (which property?) –Distillation (which property?)

Matter Classification Breaking down matter into substances and mixtures of substances.

Matter - what is it? (cont) Chemical Property - the ability of a substance to undergo a chemical rxn to form new substances combustion - burning in oxygen rusting - chemical property of Fe others? Chemical change - a change that changes the substance into a new substance (has new physical properties)

Separation Technique - Distillation Separate based on? Which substance is separated first? Common for Distilled water (DI water) (Deionized water)

Atomic / Nucleus Size Elements are composed of atoms This is the typical size of an atom, which is ~10 nm diameter About 100 thousand in a line would be 1 millimeter.