A cup of water is surrounded by air at room temperature. How could you collect evidence to determine whether this system is at equilibrium?

By measuring temperature and looking at the motion of the water in the cup, one can collect evidence to determine whether this system is at equilibrium

Explanation:

For any system to be in equilibrium there must be no transfer of heat and energy or motion between the system and the surrounding environment. If there is no change in the temperature and energy or motion of the cup of water, then it can be said that the system is in equilibrium.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds