Question

Differences in reactivity among the alkaline earth metals in Group 2A are shown by the ways they react with ___________.

a) hydrogen
b) chlorine
c) oxygen
d) carbon

Answer 1

Alkaline earth metals in Group 2A react with hydrogen, oxygen, and chlorine to form hydrides, oxides, and chlorides respectively.

Step-by-step explanation:

The reactivity of alkaline earth metals in Group 2A can be observed through their reactions with various elements. Among the given options, these metals react with hydrogen, oxygen, and chlorine.

For example, alkaline earth metals react with hydrogen to form metal hydrides. For instance, magnesium reacts with hydrogen to produce magnesium hydride (MgH2):

2 Mg + H2 → 2 MgH2

Similarly, alkaline earth metals react with oxygen to form metal oxides. For instance, barium reacts with oxygen to produce barium oxide (BaO):

2 Ba + O2 → 2 BaO

Lastly, alkaline earth metals react with chlorine to form metal chlorides. For instance, calcium reacts with chlorine to produce calcium chloride (CaCl2):

Ca + Cl2 → CaCl2