CHEM 105N 1st Edition Lecture 7 Outline of Last Lecture I. Percent Factor in a Problem II. DensityIII. Specific GravityIV. Practice ProblemsOutline of Current Lecture (Chapter 2- Energy and Matter)I. Potential vs. Kinetic EnergyII. Temperature ScalesA. Celsius to FahrenheitB. Fahrenheit to CelsiusC. Kelvin ScaleIII. MatterA. Pure substances-Elements-CompoundsB. MixturesCurrent LectureI. Potential vs. Kinetic Energy:- Potential energy- Stored energy for use at a later time- Ex. Water behind a dam, gasoline in a gas tank- Kinetic Energy- Energy of matter in motion- Ex. Water flowing over a dam, burning gasolineII. Temperature Scales:- The measure of how hot or cold something is- Heat flows from an object with higher temperature to one of lower temperature- Heat is measured in Joules or Calories-4.184 Joules (J) = 1 Calorie (Cal) [EXACT]- In science, temperature is measured in Celsius (Metric)A) Celsius to Fahrenheit:- Tc= (Tf – 32)/1.8B) Fahrenheit to Celsius:These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Tf= 1.8 (Tc) + 32C) Kelvin Scale:- Tk= Tc + 273III. Matter:-Anything that has mass and occupies space-Can be classified as a Pure Substance or MixtureA. Pure Substances - Has a fixed composition - Can be classified as an Element or Compound Elements are pure substances that contain atoms of only one type- Ex. Copper (Cu) Compounds are made up of two or more combined elements (in a definite ratio)- Ex.Salt (NaCl)B. Mixtures- Two or more chemicals that are physically mixed, NOT chemically combinedEx. Spaghetti in water- Can be separated by physical methodsEx. Filtration & Chromatography- Mixtures are either Homogeneous or Heterogeneous- Homogeneous- Uniform, different parts are not visible (Ex. Coffee)- Heterogeneous- NOT Uniform, different parts are visible (Ex. Oil &
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