Shape and polarity can affect how a molecule fits into another structure and how it tastes. It can affect how easy the molecule is to separate and it's attraction positively or negatively charged objects. Atoms have __ potential energy and __ stability after they form a covalent bond.
How much you can expect to pay out of pocket for a flu shot, including what people paid in 2017. The cost of flu shots varies by location, but usually ranges between $5 and $30. 1  Many health insurance plans cover flu shots as part of a wellness plan. For example, Blue Cross Blue Shield of North Carolina covers flu shots for members who have preventive care benefits.
How long your own flu shot lasts depends on how powerfully your own immune system reacts to it, said Dr. John J. Treanor, a vaccine expert at the University of Rochester medical school. In a young, healthy person, protection might last for years, even as circulating flu strains change. Conversely, he said, there is some debate about whether older people or those with compromised immune systems ought to get two flu shots per season, since a shot they got in October may wear off by March or April.