The answer is the last option
Answer:
D
Explanation:
A The calcium chloride dissolves in solution
B The mass of the solution totals 20 g
C The temperature of the solution is 35 degrees
D The solution became lighter in color
The correct answer would be that <u>the solution became lighter in color.</u>
An increase in temperature can also be considered a sign of a chemical reaction but in this case, the dissolution of calcium chloride in water is in itself exothermic.
A change in the mass of the final solution could also be considered a sign of a chemical reaction but in this case, the total mass equals the addition of the individual masses of the reactant.
The dissolution of calcium chloride in water is not enough as evidence of a chemical reaction. Dissolution can be a physical change of which, the evaporation of the water would retrieve the solute.
<em>A change in color, however, is one of the evidence to establish that a chemical reaction has occurred.</em>
The correct option is D.
Answer:
E. 8.08 x 10⁴.
Explanation:
Hello,
In this case, for the reaction:
We can compute the Gibbs free energy of reaction via:
Since both the entropy and enthalpy of reaction are given at 298 K (standard temperature), therefore:
Then, as the equilibrium constant is computed as:
We obtain:
For which the answer is E. 8.08 x 10⁴.
Best regards,
Answer:
The pOH would be 7.7 if the pH is 6.3!
Hope it helps!
