This report on Door Lock & Lockset Manufacturing: 1  Provides Market Size information to assist with planning and strategic decisions. 2  Includes the necessary information to perform SWOT, PEST and STEER analysis. 3  Helps you understand market dynamics to give you a deeper understanding of industry competition and the supply chain.
Your first step should be to analyse the compound. For example, if the compound is carbon, you know it always has a valence of four, so, if it has a formula C2H4 (ethylene) it obviously has a double bond. There are difficulties here because benzene C6H6 can be considered to have 6 1.5 C-C bonds, being aromatic.
One example of a double bond is as close as your nose: dioxygen gas (O=O, or O2), which you are breathing right now. Because carbon has a valence of 4, it can form two or three bonds with another carbon atom, and still be able to bond other atoms. In the figure above, notice that the ball-and-stick models do not show two or three sticks to correspond to double and triple bonds.