The graph represents the reaction 3H2 + N2 32NH3 as it reaches equilibrium. Based on the graph, which two statements about this reaction
are true? THE ANSWERS ARE A AND B.
a. equilibrium is reached after point 3. b. at point 4, the concentrations of NH3,N2, and H2 remain constant. c. after point 3, the reaction stops. d. equilibrium is fir. st reached at point 4.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2