Best Answer: Polar bond = simply a type of covalent bond in which the electrons are shared but not equally. This happens when two different atoms come together, such a C and O. Each atom has a different ability to draw electrons to itself when it shares electrons (that drawing ability is called Electronegativity).onpolar bond = two of the same atoms come together, such as the diatomic molecule N2, or triatomics such as O3, etc. A nonpolar covalent bond could be viewed as having pure covalent character. There is perfectly equal sharing. Source(s): http://iweb.tntech.edu/snorthrup/chem111...
Some people who have chronic obstructive pulmonary disease â such as emphysema â develop a slight barrel chest in the later stages of the disease. It occurs because the lungs are chronically overinflated with air, so the rib cage stays partially expanded all the time.
What causes chest pain? Chest pain can be caused by a range of conditions, from not serious to life-threatening. It may be caused by a heart attack or a blood clot in your lungs. Sometimes chest pain or pressure is caused by poor blood flow to your heart (angina). Infection, inflammation, or a fracture in the bones or cartilage in your chest can cause pain or discomfort. Chest pain can also be a symptom of a digestive problem, such as acid reflux or a stomach ulcer.