Photolithography is the process by which we make the tiny circuits necessary for the tiny transistors in today’s electronics. To do this we must create very thin films of a chemical burn carveout channels that are filled with metal to creat the circuits. One posible candidate for making these thin films is butyltin trichloride, C4H9SnCl3. In the presence water this chemical loosens some of its bound chloride atoms producing hydrochloric acid HCI, arrording to the chemical equation below C4H9SnCl3+H2O=C4H9Sn(OH)2Cl+HCl

Wind will blow from one direction to another.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

Noble gases is far right