The equation 2NO2 <---> N2O4 shows a system.

AIn chemical equilibrium
BIn physical equilibrium
CThat does not reach equilibrium
DThat does not change

If an endothermic reaction is in equilibrium, what will happen when you increase the temperature?

AMore reactants form
BMore products form
CNo change in the amounts of products or reactants occurs
DThe system does not reach equilibrium again

Only way to determine the degree of saturation of a solid-liquid solution is to drop a crystal of the solute into the solution. If the crystal sits at the bottom of the container, the solution is?

ASaturated
BUnsaturated
CSupersaturated
DConcentrated

Thank you in advance <3

The sign between the reactants and products is used to represent a chemical equilibrium. In a chemical equilibrium, the rate at which product is being produced is the same as the rate at which the product is being consumed to form the reactant again.
2 B) More products form
This is in accordance to Le Chatelier's principle, which basically states that a reaction mixture at equilibrium will resist any change that is produced in it. Therefore, if the temperature is increased, the mixture will move towards the products side, which has a lower temperature due to it being an endothermic reaction.
3 A) Saturated
When a solution is saturated, it is no longer able to dissolve any more solute within it. A crystal of solute sitting at the bottom is an indicator that no more solute can be dissolved, meaning the solution is saturated.