Identify these reactions 2 Na + Cl 2  2 NaCl

CaCO 3  CaO + CO 2
Zn + HCl  ZnCl 2 + H2
S + O 2  SO2
Ag NO 3 + NaCl  AgCl + NaNO 3

4Fe + 3O 2  2 Fe 2 O 3
2HgO  2 Hg + O 2

NaNO" (and any subsequent words) was ignored because we limit queries to 32 words.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

let that person have a turn to speak : )