Please help thank you

(I’ll mark brain list and give 23 points)

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

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate