Question

6. Define substances with different types of chemical bond among following 6 points Covalent Ionic Metallic Hydrogen Na2S04 0 0 Mg P4010 0 0 0 0 C LIF CH3OH O O O KOH

Answer 1

6)

Covalent lonic Metallic Hydrogen Na2SO4 ✓ Mg ✓ P4010 ✓ LiF ✓ CH3OH ✓ KOH

7.

The increasing order of electronegativity: Cs < Al < Te < I < O

Electronegativity of an element increases along the period from left to right and decreases down the group.

Some close values are: Cs(0.79) < Al(1.61) < Te(2.1) < I(2.66) < O(3.44)

8. Balanced equations are:

1) 5KClO₃ + 6P → 3P₂O₅ + 5KCl

2) 5NaBr + NaBrO₃ + 3H₂SO₄ → 3Br₂ + 3Na₂SO₄ + 3H₂O

3) 2KI + MnO₂ + 4HNO₃ → 2KNO₃ + Mn(NO₃)₂ + 2H₂O + I₂

9.

a) Balanced thermochemical equation: P₂O₅ + 3H₂O → 2H₃PO₄

b) Heat released when 0.49 g of P₂O₅ were reacts with water = 0.7177 kJ = 717.7 J

Heat released when 1g of P₂O₅ were reacts with water = 12.48 kJ/ 8.52g = 1.464 kJ/g

So, Heat released when 0.49 g of P₂O₅ were reacts with water =  (1.464 kJ/g) * (0.49 g) = 0.7177 kJ = 717.7 J

Hope it will help, thank you. If you find it useful please give an upvote.