Lewis structure of water The Lewis structures, also called Lewis-dot diagrams or electron dot diagrams are pictures that show the bonding between a pair of electrons and the atoms of a molecule. Each dot represents one electron. Two dots side by side represent a lone pair of electrons. To show a bond between atoms, a line representing a pair of shared electrons is placed between the two atoms.
Or, maybe you're wondering just how old the tires are on the motorcycle you just bought. Here's how to tell: Look on the sidewall of the tire for the DOT symbol. Follow the line of text and numbers after the DOT symbol until you reach the end. If the tire was manufactured in the year 2000 or later, the last 4 digits give the age. The last 2 digits give the year and the preceding 2 digits give the week of manufacture.
Car companies and tire companies have sent bulletins to dealers saying that tires older than six to ten years should be replaced. WATCH a video on how to tell the age of your tires. Fortunately, you don't have to depend on a professional to determine the age of your tires.The answer is right in front of you, written on the side of the tire itself. Every tire has a Tire Identification Number -- a serial number -- inscribed on its sidewall.On tires manufactured after 2006, the number is written on the sidewall that faces out and is easily visible.n fact, as all tires age they become more prone to losing their tread suddenly and causing an accident. According to the National Highway Traffic Safety Administration (NHTSA), when tires are older than six years, the chances of a sudden tread separation start to climb.