The heat of fusion is the amount of heat required to melt 1g of solid into liquid evaporate 1g of liquid into gas make material combust make a substance sublimate

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

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