Why does one atom have a partial negative charge in a polar covalent bond?

For the following, determine the type of reaction and then give products.

What is the molar mass of a gas that has density of 2.054 g/l

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.