Question

Write the reactions, that describe chemical properties of metals: Zn, Cr, Mn, Fe. Make a conclusion about their chemical activity and role in human organism.

Answer 1

Sure! Here are the chemical reactions that describe the chemical properties of the metals you mentioned:

1. Zinc (Zn): Zn + 2HCl → ZnCl2 + H2 Zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen gas.

2. Chromium (Cr): 2Cr + 3Cl2 → 2CrCl3 Chromium reacts with chlorine gas to form chromium(III) chloride.

3. Manganese (Mn): 2Mn + 3Cl2 → 2MnCl3 Manganese reacts with chlorine gas to produce manganese(III) chloride.

4. Iron (Fe): 3Fe + 4H2O → Fe3O4 + 4H2 Iron reacts with water to form iron(II,III) oxide and hydrogen gas.

Conclusion: Based on the chemical reactions described above, we can observe that these metals exhibit different chemical properties. Zinc is an active metal and readily reacts with hydrochloric acid to produce a salt (zinc chloride) and hydrogen gas. Chromium and manganese react with chlorine gas to form their respective chlorides. Iron also reacts with water to form iron oxide and hydrogen gas.

In terms of chemical activity, zinc is more reactive compared to chromium, manganese, and iron. It readily undergoes reactions with acids and displaces hydrogen from water. Chromium, manganese, and iron are less reactive than zinc but still exhibit reactivity with certain elements or compounds.

In the human body, these metals play essential roles as trace elements. Zinc is involved in numerous enzymatic reactions and is important for immune function, DNA synthesis, and wound healing. Chromium is required for glucose metabolism and is involved in insulin action. Manganese serves as a cofactor for various enzymes involved in energy metabolism and antioxidant defense. Iron is crucial for oxygen transport in the blood as a component of hemoglobin.

Overall, these metals have different chemical activities and play important roles in various physiological processes in the human body.