Zn III. Answer the following questions.
1. Indicate which of the following unbalanced equations represents
a redox reaction.
a- SO; + H2O + H2SO,
b- 1,0; + CO + 12 + CO,
2. Refer to the diagram (fig. 32) to answer the following questions.
-- Infer why heat production ceases eventually in this reaction.
h- Describe the macroscopic observations which suggest a chemical
reaction has taken place?
(- Explain what is happening at the microscopic level.
CuCl, Solution
Fig. 32
6
С
Unit Three: Electrochemistry​

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

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

Chemical energy is a form of a. kinetic energy only. b. both potential and kinetic energy. c. neither potential nor kinetic energy. d. potential energy only. reset