Which of the following is characteristic of all reversible systems at equilibrium?
activation energy is not required.
changes do not occur at the microscopic level.
two opposing reactions occur at the same rate.
they occur in open systems.
a catalyst affects the forward reaction.

All forces cause motion? true or false

Find the number of moles of argon in 364g of argon.

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth