Please help what are the equations for these:

Fe and Pb(NO3)2
Fe and ZnSO4
Cu and HCI
Cu and Pb (NO3)2
Cu and ZnSO4
Zn and water
Zn and HCI
Ag and HCI
Ag and Pb(NO3)2
AG and ZnSO4
Pb and CuSO4
Pb and AgNO3
Pb and MgSO4

A__ is two or more substances that are together in the same place but are not chemically combined

This graph gives information on changes in sea ice extent in the arctic ocean over a 30-year span. the overall trend shows in the ice extent. to address the trend, scientists need to ask themselves, one direct consequence of the trend is that

Jewelweed, a flowering plant, has seed pods that burst open when touched and forcefully eject their seeds. these structures are favorable because they a. can cause genetic changes to occur. b. prevent germination within the seed pod. c. aid in the dispersal of the species. d. attract insects that aid in pollination.