Giant covalent structures. Such as silicon dioxide, have extremely high melting points and low solubility in all solvents. They are non-volatile and conductivity depends on the availability of electrons in the valence shell (eg graphite). If all electrons are used in bonding they are insulators.ow melting points:- The bonds between molecules are very weak, especially when the molecules are small. It only requires a small quantity of heat energy to create enough molecular vibration to break the molecules attraction for one another and the solid melts.
Weight gain: Being overweight, obese, or quickly gaining significant amounts of weight can put stress on the back and lead to low back pain. Genetics: Some causes of back pain, such as ankylosing spondylitis, a form of arthritis that involves fusion of the spinal joints leading to some immobility of the spine, have a genetic component.
Here are ways to treat these issues and how you can prevent future back pain. 1) Muscle or ligament strain is one of the most common reasons for back pain in women. It affects all ages and is caused by strenuous lifting. Other causes may be pregnancy or sports-related activities. Treatment: Physical therapy, rest, limited activity and the application of ice/heat.