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When a lot of people picture a fire extinguisher, the picture that's called to mind belongs to a CO2 extinguisher. With their large, metals cylinders of bright red and hard horns, these fire extinguishers have been installed as an emergency measure in homes and businesses for generations. Carbon dioxide extinguishers could be differentiated from similar extinguishers through the lack of any kind of pressure gauge at the top of the tank. This is usually referred to as The General Chemistry Study Guide. This includes 113 pages in three categories. The first part is a brief explanation of content normally chemistry. In the second part you'll find example exam questions. In the final area of the guide, you can find practice questions. Content is produced by both semesters of General Chemistry and includes: Descriptive Chemistry / Periodicity Electrochemistry / Redox Molecular Structure and Bonding States of Matter / Solutions Atomic Structure Energetics Dynamics Stoichiometry Equilibrium Laboratory Chemistry This picture amazingly captures the think layer of clouds in the valley close to the south of Lake Como, northern Italy. In the above image, the dense cloud hides almost the valley and instead gives off some artificial lights that will make the town just like an opaque blanket. The village over distance is clearly seen out from the blanket.