Do you think it is good to bring torches into the cave ​

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

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

How many moles of oxygen react with 12 moles of aluminum