Which of the following elements could replace copper in a single replacement reaction? A. gold
B. lithium
C. sodium
D. lead

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c