Which is a big idea of physical science?

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?

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