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Finally, you can choose how long it is until the background image changes, from mere seconds to minutes, from a couple of hours to just once a day. Click "Save changes" to commit these edits and go back to your desktop to await the next change in its visual finery. It was on February 27th, 1892 that Diesel filed a patent within the patent office in Germany for his method and design for that combustion engine. He sourced contracts from firms that manufactured machines and began his experimentation stage. During this stage he constructed working types of his design in an attempt to construct the most efficient engine of that time. 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