Chem40s - Solubility Equilibrium Keq & Ksp

Can you write the Keq expression for the below balanced equation?

CO(g) + 3H2(g) --> CH4(g) + H2O (g)

Ksp = [Pb²⁺][I-]²

What is the balanced chemical equation from the Ksp?

• PbI (s) --> 2Pb (aq) + I (aq)

• PbI₂ (s) --> Pb + 2I

• PbI₂ (s) --> Pb ²⁺ + 2I^-

• PbI₂ (s) --> Pb ²⁺ (aq) + 2I^- (aq)

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What is the K_c expression for this reaction?
   2 NO_(g)  +  O_2(g) ⇌  2 NO_2(g)

• K_c = [NO₂]² / [NO]² [O₂]
• K_c =  [NO]² [O₂] / [NO₂]²
• K_c = [NO]² [O₂] [NO₂]²
• K_c = [NO₂]² / [NO]² +  [O₂]

What are [A] and [B]?

• concentration of reactants
• concentration of products
• energy of reactants
• energy of products

Tags

NGSS.HS-PS1-5

The following reaction :    
SO_{2 (g)} +  NO_{2 (g)} <=> SO_{3 (g)} + NO (g)  
had reached a state of equilibrium, was found to contain  
0.40 mol L^-1 SO₃ , and 0.30 mol L^-1 NO,
0.15 mol L^-1NO₂ , and 0.20 mol L^-1 SO₂.
Calculate the equilibrium constant  for this reaction. 

• 4
• .42
• .25
• 1

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

What is the equilibrium expression for: Fe₃O₄(s) + 4H₂(g) <=> 3Fe(s) + 4H₂O(g)

Keq =

• [Fe]³ [H₂O]⁴  / [Fe₃O₄] [H₂]⁴
• [Fe₃O₄] [H₂]⁴ /  [Fe]³ [H₂O]⁴
• [H₂O]⁴ / [H₂]⁴
• [Fe] [H₂O] / [Fe₃O₄] [H₂]

If the equilibrium constant is much greater than one (K >> 1) then

• Equilibrium is not established.
• Equilibrium lies to the right (products are favored)
• Equilibrium lies to the left (reactants are favored)
• Neither products or reactants are favored.

Which of the following is true about chemical reaction at equilibrium

• only the forward reaction stops

• only the reverse reaction stops

• both forward and reverse reactions stop

• the rates of the forward and reverse reactions are equal

What is the reaction/equation for this K_c expression_

• 2N₂ + O₂ ⇌ 2NO

• N₂ + O₂ ⇌ NO

• NO ⇌ 2NO

• N₂ + O₂ ⇌ 2NO

Tags

NGSS.HS-PS1-7

What do we call the substance that is being dissolved?

• Solute

• Solvent

• Concentration

• Electrolyte