A scientist uses materials in her lab to separate DNA fragments by size. What process is she using?

When molecules of water vapor in the air come in contact with a cold can of soft drink , they lose energy ,slow down,and form a liquid due to decrease in ?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter