How many moles are in 1.0 x 109 atoms of Zn?

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

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