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.
The first two digits are the week, and the second two are the year the tire was produced. RV tires age out before they wear out in most cases. Once a tire gets to five to seven years of age, they should be inspected by a tire professional annually for signs that theyâre failing. The industry generally agrees that after 10 years, especially when the tires are heavily loaded, they should be replaced, regardless of wear.