Chemistry : An Introduction

The various parts of the scientific method

Student - centered Learning

Atom Combinations

Structure of Matter

Chemistry 140 Fall 2002 States of Matter

Classification of Matter Can it be physically separated? Homogeneous Mixture (solution) Heterogeneous Mixture Compound MIXTURE PURE SUBSTANCE yes no Can it be chemically decomposed? Is the composition uniform? Colloids Suspensions Element

The composition of Air

Electrolysis The decomposition of water by an electric current, is a chemical process.

Separation of a sand-saltwater mixture

Filtration separates a liquid from a solid.

The solution is boiled and steam is driven off.

Laboratory Equipment

Laboratory Equipment Laboratory equipment should never be removed from the labs. The equipment should never be used in a manner not described by your teacher. Unauthorized lab experiments are strictly forbidden. You may not use the lab without a teacher present and with your teachers permission.

Chemical Reaction Inquiry Lab: “Chemical Baggie Science” Students are given the following three chemicals: 1. Calcium chloride - CaCl2 2. Sodium Bicarbonate - NaHCO3 3. Bromothymol Blue They are also given a 10 ml graduated cylinder and plastic baggies. They are told that they must try every combination possible from the three chemicals that they are given. The reactions can be conducted in sealed plastic baggies. After making some initial observations, students must conduct an experiment of their choice based on the scientific method.

Elephant’s Toothpaste Hot Pack/Cold Pack Lab Locate the chemicals that are in hot packs and cold packs. Demonstrate how the packs work by performing two different kinds of reactions. Endothermic and Exothermic Elephant’s Toothpaste Mix: Saturated Solution of Manganese Dioxide with 12% solution of Hydrogen Peroxide and detergent. You can add stripes of food coloring for dramatic effect.