Which substance is the reducing agent in the following reaction? Ca(s) + Zn2+(aq) → Ca 2+(aq) + Zn(s)

For the following, in which case would the buffer capacity not be exhausted either by the addition of 0.5 moles of HCl or by the addition of 0.5 moles of NaOH?    

When a voltaic cell reaches equilibrium, __________

What effect will adding additional C (g) to the following equilibrium system have, once equilibrium is reestablished? 2 A (g)

 The purpose of the salt bridge in an electrochemical cell is to ________.

20). What makes an organism a keystone species?

19). Colony collapse disorder may have no one single cause but may result from many interacting factors affecting bees, including poor nutrition, pathogens, and pesticides.

The equilibrium constant for reaction 1 is K = 5. The equilibrium constant for reaction 2 is ________.                 (1) 2A(g) + B (g)

2). Which of the following is considered a keystone species?

4). Match the correct term the following definition: thick-walled plant structures that contain cells that develop into sperm.