When a system is at equilibrium there must be equal amounts of reactants and products? True or False?

The first statement is false. There are many reactions where most if not all of the products react to form the products. Equilibrium means that the ratio between the two is stable, not that the two are equal.

The second statement is true. At equilibrium, even though individual molecules may be switching back and forth from products to reactants and vice versa, overall the ratio of the two is stable and there are no observable changes.

The answer to the first question is false. The answer to the second question is true.

The reason that the first question is wrong comes from the definition of equilibrium, which is the second question. Equilibrium happens when there is no NET change in the system, and the changes include chemical composition as well as thermodynamic properties, such as the uniformity of temperature within the system.

Let's assume that there is a reaction where A + B -> C and the reverse reaction, C -> A + B also happens. There is an equilibrium constant that relates the concentrations of the reactants on the left ( A and B) and the product (C) on the right which includes the decomposition of C back into the reactants (A and B). At equilibrium, the reaction moving to the right is creating as many moles of C as the reaction from right to left is consuming making A and B. Thus, there is no net change in the concentrations of A, B or C, even though the reactions happen. It simply that the reaction in one direction is equal to the reaction in the reverse direction, so the difference cannot be seen. That is the chemical equilibrium of the system.

Oh absolutey not.

For an equilibrium to be attained it is not necessary for there to be equal amount of reactants and products. Here is an analogy; consider a skii resort with 20 people on top and 30 people on the bottom. an equilibrium is achieved when the same number go as they come down. The number of people at the top and the bottom doesnot change. Note however that that number may not be 20 and 30 respectively.

it is true that there are no observable changes at macroscopic level.

At equilibrium, the rate of forward reaction is equal to the rate of backward reaction. This says nothing about the relative number of moles on either side of the reaction, though. The first statement is only true if Kc (equilibrium constant) = 1. If Kc >1, there will be more products at equilibrium, and if Kc <1, there will be more reactants at equilibrium.

And true for the second one. Since the net amount of moles on either side of the reaction does not change, there are no changes observable macroscopic properties.

False: the amounts of products and of reactants do not need to be the same (and almost never are the same).

True: The system is at equilibrium; a change towards products is counterbalanced by an equal change towards reactants.

True, what goes in must come out. In engines the power put in is put into work (as in the moving of the car) and the rest is thrown to waste i.e. the exhaust. And the second is false for the reason above. If there were no observable facts a car would not move.

the 1st one is true cuz i just took that test in science, so i am very sure on it

the second one is true..... you can only observe the atoms, elements, products, and reactants

When a system is in equilbrium, all of it is like the word suggests....=

yes.