At some temperature, the rate constant for the decomposition of HI on a gold surface is 0.080 mol L^-1 s^-1 : 2 HI(g) H2(g) + I2 → (g) (a) What is the order of reaction?
(b) How long will it take for the concentration of HI to drop from 1.50 mol L^-1 to 0.30 mol ?

(c) The gold surface acts as a heterogeneous catalyst. Describe the four steps involved in this
reaction.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.

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