Other Chemistry Answers

Which set of quantum numbers (n, l, ml, ms) is not possible for an electron to have?

1. 3, 2, -1, -½
2. 1, 0, 0, -½
3. 2, 1, 1, ½
4. 4, 2, 3, ½
5. 6, 4, -3, -½

Identify the atom with electron configuration [Kr] 5s²4d² 

1. Sn
2. Ti
3. Zr
4. Tc
5. Sr

how many molecules are in 1 moles of carbon monoxide .what will it's mass be

determine how many electron/s are lost or gained in the half-reaction.

1.     Al → Al³⁺

a. 2

b.     3

c.      4

d.     6

2.     O^2– → O₂

a.      2

b.     3

c.      4

d.     6

3.   SO₃^2– → SO₄^2–  

a.      2

b.     3

c.      4

d.     6

4.     PbO₂ → Pb²⁺

a.      2

b.     3

c.      4

d.     6

1.     Which of the following reaction is a reduction reaction?

a.      Fe → Fe³⁺

b.     Cr → Cr³⁺

c.      MnO₄^2– → MnO₄^–

d.     Na⁺ → Na

2.     Which of the following reaction is a reduction reaction?

a.      Fe²⁺ → Fe³⁺

b.     Sn²⁺ → Sn⁴⁺

c.      Fe(CN)₆^3– → Fe(CN)₆^4–

d.     Mn²⁺ → MnO₄^–

The chloride ion content of a 250.0-mL seawater sample was titrated against 0.1102 M silver nitrate, requiring 13.56 mL to reach end point.

 What is the reaction for the titration analysis?

a.      Ag⁺ + NO₃⁻ + Cl⁻ ⇌ Ag⁺ + NO₃⁻ + Cl⁻

b.     AgCl + NO₃⁻ ⇌ AgNO₃ + Cl⁻

c.      NO₃ + Cl ⇌ NO₃Cl

d.     AgNO₃ + Cl⁻ ⇌ AgCl + NO₃⁻

  How many moles of chloride ion is present in the sample? (2 points)

a.      1.494 × 10⁻³

b.     2.989 × 10⁻³

c.      7.472 × 10⁻⁴

 What is the molarity of the chloride ion in the seawater sample? (2 points)

a.      5.976 × 10⁻³

b.     0.01196

c.      2.989 × 10⁻³

1.     What is the solubility product expression for silver carbonate?

a.      K_sp = [Ag⁺]² [CO₃²⁻]

b.     K_sp = [Ag⁺] [CO₃²⁻]²

c.      K_sp = 2 [Ag⁺] [CO₃²⁻]

d.     K_sp = ½ [Ag⁺] [CO₃²⁻]

3.     What is the molar solubility of the solution? (2 points)

a.      3.23 × 10⁻⁴

b.     2.24 × 10⁻³

c.      1.30 × 10⁻³

d.     1.28 × 10⁻⁴

5.     Calculate the mass of silver carbonate that will dissolve in 150.0 mL of water. (2 points)

a.      0.0134 g

b.     0.0927 g

c.      5.29 × 10⁻³ g

d.     0.0538 g

1.     What would be the solubility product constant (K_sp) equation for a theoretical compound X₃Y?

a.      K_sp = 3 [X⁺] [Y³⁻]

b.     K_sp = [X⁺]³ [Y³⁻]

c.      K_sp = [X⁺] [Y³⁻]³

d.     K_sp = ⅓ [X⁺] [Y³⁻]

2.     What would be the solubility product constant (K_sp) equation for a theoretical compound XY₂?

a.      K_sp = [X²⁺] ½ [Y⁻]

b.     K_sp = [X²⁺] 2 [Y⁻]

c.      K_sp = [X²⁺] [Y⁻]²

d.     K_sp = [X²⁺] 2 [Y⁻]

3.     What would be the solubility product constant (K_sp) equation for a theoretical compound X₂Y₃?

For Items 3 to 5, use the following reaction.

Fe(NO₃)₃ + NaOH → Fe(OH)₃ + NaNO₃

Which of the following are spectator ions?

a.      Fe³⁺ and OH⁻

b.     OH⁻ and NO₃⁻

c.      Na⁺ and NO₃⁻

d.     Na⁺ and OH⁻

     Which of the following is the net reaction for the reaction above?

a.      Fe(NO₃)₃ + NaOH → Fe(OH)₃ + NaNO₃

b.     Fe³⁺ + OH⁻ → Fe(OH)₃

c.      Na⁺ + NO₃⁻ → NaNO₃

d.     Fe³⁺ + NO₃⁻ + Na⁺ + OH⁻ → Fe³⁺ + OH⁻ + Na⁺ + NO₃⁻

e.      None, no precipitation reaction occured.

A container contains 2.5m ³ of Helium gas at 15 ⁰ C and 98 Nm -2 pressures. What volume would this gas occupy at S.T.P?