Northampton Community College
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This 2 page Class Notes was uploaded by Esraa Hagag on Thursday September 22, 2016. The Class Notes belongs to chem135 at Northampton Community College taught by edward s fleming in Fall 2016. Since its upload, it has received 3 views. For similar materials see chemistry of life in Chemistry at Northampton Community College.
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Date Created: 09/22/16
Heat (thermosenergy) Its form of energy important in chemistry include: Light Sounds Electrical Mechanical energy: is associated with the moving parts of machines Heat and temperature are related but are not the same thing Heat units: 1. Calorie (scientific): It is the amount of heat (thermal energy) needed to raise one gram of water one degree Celsius. 2. Kcalorie (Kcal) Scientific unit of heat is Joule (J) 1 Cal = 4.184 J Dietary calories = 1000 scientific calories English system: British thermal unit (Btu) Chapter 4 Atoms and Elements All matter can be classified as: 1. Element 2. Compound 3. Mixture Element Pure substance that cannot be chemically broken down into simpler substance or matter Atom It is the smallest particle of element having properties of that particular element Atoms are basic building of all matter Around 112 elements Around 88 naturals Chemical symbol: is 1 or 2 letter symbol representing one atom of some element e.g. C carbon, N nitrogen Compounds Pure substances consisting of 2 or more different elements in affixed proportion chemical formula: shows the kind and number of atoms in a compound H2O, C 12O22 11 The molecule is the smallest part of a compound that still has the property of compound Chemical formula represents one molecule At 13 million compounds in existence when elements combine (in chemical R ) xn to form compounds they lose individual identity. E.g. hydrogen, oxygen Compounds can be chemically broken down into their constant elements Mixtures Blend of two or more pure substances not a compound because: Components in mixture still have their own properties In a mixture the ratio of components is highly variable The mixture properties are a weighted average of components properties
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