CHEM 105 1st Edition Lecture 1Outline of Current Lecture I. Defining ChemistryA. Origination of Chemicals and equipment II. Measurements (Units in Metric and SI Systems)III. Learning Check and Practice QuestionsCurrent LectureI. Defining Chemistry- Chemistry is the study of matter and it’s:- Composition,- Structure,- Properties, and- Reactions.- The Field of Chemistry is divided into branches:- General Chemistry- Organic Chemistry- Biochemistry- Alchemists were regarded as early chemists- They learned to extract metal from ores- Developed early lab equipment and procedures- Paracelsus believed that chemicals and minerals could be used as medicines.- Chemicals are substances which have a constant composition and set of properties II. Measurements (Units in Metric and SI Systems)-Length:- Measured using a METER stick- Uses the unit Meter (m) in both metric and SI Systems- Uses centimeters (cm) for smaller units of measurementEX:II.54 cm = 1in.1m = 100 cmThese 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.1m = 39.4 in.1m = 1.09 yd- Volume:- Is the space occupied by substance- Uses the unit Liter (L) in the metric system- Uses the unit Cubic Meter (m^3) in the SI System - Is measured using a graduated cylinder in units of milliliters (mL)- Mass:- Is a measure of the quantity of materials it contains - Is measured on a balance- Is measured in grams (g) for small masses- Is measured in kilograms (kg) in the SI System- Temperature Measurement:- Is measured on the Celsius scale (°C) in the metric system- Is measured on the Kelvin (K) scale in the SI System - Time Measurement:- uses the unit second (s)in both the metric and SIsystems- Is based on an atomic clock that uses a frequency emitted by cesium atomsIII. Learning Check& Practice QuestionsFor each of the following, indicate whether the unitdescribes length, mass, or volume.________ A. A 10.0 lb bag of tomatoes is 4.5 kg.________ B. A person is 2.0 m tall.________ C. A medication contains 0.50 g of aspirin.________ D. A bottle contains 1.5 L of water.ANSWERS:A. MassB. LengthC. MassD. VolumeIdentify the measurement that has an SI unit.1. John’s height is _____.A. 1.5 yd B. 6 ft C. 2.1 m2. The race was won in _____.A. 19.6 s B. 14.2 min C. 3.5 h3. The mass of a lemon is _____.A. 12 oz B. 0.145 kg C. 0.62 lb4. The temperature is _____.A. 85°C B. 255 K C. 45°FANSWERS:1) C2) A3) B4)