Question

Help!!!
20 points and BRAINLIEST

45) Write a balanced net ionic equation for the following reaction. (2 points)
H3PO4 (aq) + Ca(OH)2 (aq)  Ca3(PO4)2 (aq) + H2O (l)




46) How many liters of O2 are needed to react completely with 45.0 L of H2S at STP? (2 points)
2H2S (g) + 3O2 (g)  2SO2 (g) + 2H2O (g)




47) Describe the shapes and relative energies of the s, p, d, and f atomic orbitals. (3 points)



48) Explain how atoms (ions) are held together in an ionic bond. Give an example of an ionic compound. (3 points)

Answer 1

45.) 3 Ca(OH)2(aq) + 2 H3Po4(aq) = 6 H2O(l) + Ca3(Po4)2(s)

I'll try to find the others.

Answer 2

45) Balanced chemical reaction:

3Ca(OH)₂(aq) + 2H₃PO₄(aq) → Ca₃(PO₄)₂(aq) + 6H₂O(l).

Balanced ionic equation:

3Ca²⁺(aq) + 6OH⁻(aq) + 6H⁺(aq) + 2PO₄³⁻(aq) → 3Ca²⁺(aq) + 2PO₄³⁻(aq)+ 6H₂O(l).

Balanced net ionic equation: 6OH⁻(aq) + 6H⁺(aq) → 6H₂O(l).

This reaction is example of neutralization reaction.

46) Answer is: 67.2 liters of oxygen are needed to react completely.

Balanced chemic equation: 2H₂S(g) + 3O₂(g) → 2H₂O(l) + 2SO₂(g).

V(H₂S) = 45.0 L; volume of hydrogen sulfide.

Vm = 22.4 L/mol; molar volume at STP.

n(H₂S) = 45 L ÷ 22.4 L/mol.

n(H₂S) = 2.01 mol; amount of hydrogen sulfide.

From balanced chemical reaction: n(H₂S) : n(O₂) = 2 : 3.

n(O₂) = 3 mol; amount of oxygen.

V(O₂) = 3 mol · 22.4 L/mol.

V(O₂) = 67.2 L; volume of oxygen.

47) The azimuthal quantum number (l) determines its orbital angular momentum and describes the shape of the orbital.  

s-orbitals (for example 1s, 2s) are spherically symmetric around the nucleus of the atom.

p-orbitals are dumb-bell shaped. l = 0,1...n-1, when l = 1, that is p subshell.

d-orbitals are butterfly shaped.

f-orbitals are similar to the d orbital, but cut in half (eight lobes instead of four).

48) Answer is: Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

For example, compound magnesium chloride (MgCl₂) has ionic bond.

Magnesium (Mg) transfers two electrons, and form positive cation Mg²⁺, to two chlorine atoms (Cl), which form negative anions Cl⁻.

Magnesium is metal from group 2 and chlorine is nonmetal from group 17 of the Periodic table.