Question

2. Write the chemical formula of pyrite.

3. Write the chemical formula of magnetite.

4. Write two balanced chemical equations for the burning of magnesium in air.

5. The following reaction is used to produce titanium metal at high temperature. TiCl4(g) + 2Mg(l) Ti(s) + 2MgCl2(l)

Which element is oxidized and which is reduced?

6. Potassium superoxide, KO2(s), is used in the breathing systems of biohazard suits. Write separate chemical equations showing how KO2(s) reacts with moisture and carbon dioxide in exhaled air to generate oxygen gas.

7. Beryllium, the first element in Group 2A, is the most metallic element in the group.
   1. True
   2. False

8. Metallic sodium is obtained commercially from molten sodium chloride by
   1. chemical reduction with magnesium.
   2. flotation.
   3. electrolysis.
   4. zone refining.
   5. roasting.

Answer 1

Dear Student, solved the first 4 questions as HOMEWORKLIB guidelines, post multiple question to get the remaining answers

1) Chemical formula of Pyrite is FeS2

2) Chemical formula of magnetite is Fe3O4 (FeO.Fe2O3)

3) The reaction will be

2Mg(s) + O2(g) ----------------------- MgO(s)

4) TiCl4(s) + 2Mg(s) ---------------- 2MgCl2(s) + Ti(s)

Ti is getting reduced from oxidation state of 4 to 0. Mg is getting oxidized from oxidation state of 0 to 2.

Note - Post any doubts/queries in comments section.