Ask a New Question
Menu

Question 11

A)
Cobalt ions form complex ions with water and chloride as shown in the reaction. The left side of the reaction is pink, and the right side of the reaction is blue.

Co(H2O)62+ + 4Cl−+heat ⇌ CoCl42−+6H2O

Which statement about the system at equilibrium is correct?

(1 point)
Responses

Cooling a purple solution will turn it pink.
Cooling a purple solution will turn it pink.

Adding hydrogen chloride (HCl) to a blue solution will turn it purple.
Adding hydrogen chloride (HCl) to a blue solution will turn it purple.

Heating a blue solution will turn it purple.
Heating a blue solution will turn it purple.

Adding water to a purple solution will turn it blue.
Adding water to a purple solution will turn it blue.
Question 12
A)Why are rubber and metal both useful while making wire?(1 point)
Responses

Both are flexible, but one conducts electricity while the other insulates.
Both are flexible, but one conducts electricity while the other insulates.

Both are flexible, but one reflects electromagnetic waves well while the other transmits them.
Both are flexible, but one reflects electromagnetic waves well while the other transmits them.

Both are good insulators, but one is more ductile than the other.
Both are good insulators, but one is more ductile than the other.

Both are good insulators, but one is flexible while the other is rigid.

1 answer

Question 11: The reaction is as follows: Co(H₂O)₆²⁺ + 4Cl⁻ + heat ⇌ CoCl₄²⁻ + 6H₂O

  1. The left side (Co(H₂O)₆²⁺) is pink, and the right side (CoCl₄²⁻) is blue.
  2. The reaction is endothermic, as heat is required on the left side to form the blue complex.

Based on Le Chatelier's principle:

  • Cooling the system would shift the equilibrium to the left, favoring the formation of the pink Co(H₂O)₆²⁺ complex.
  • Adding hydrochloric acid (HCl) increases the concentration of chloride ions (Cl⁻), which would also shift the equilibrium to the right, favoring the blue CoCl₄²⁻ complex.
  • Heating the blue solution would favor the formation of the pink complex as it shifts to the left upon cooling.
  • Adding water to the purple solution (which contains both pink and blue complexes) would dilute it, pushing the equilibrium towards the side with more solute (in this case, the blue complex).

The correct statement is: Cooling a purple solution will turn it pink.

Question 12: Rubber and metal are used together in wire for specific properties:

  • Rubber is an insulator, meaning it does not conduct electricity, while metal (such as copper or aluminum) is a good conductor of electricity.
  • Rubber is flexible, allowing it to provide insulation around the metal, which is essential for safety and proper function.

The correct response is: Both are flexible, but one conducts electricity while the other insulates.