contestada

1. What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodine?

a. Br2 + NaI -> NaBr2 + I
b. Br2 + 2NaI -> 2NaBr + I2
c. Br + NaI2 -> NaBrI2
d. Br +NaI2 -> NaBr + I2

2. Which fact is the most important indicator that the following reaction will take place?

Ni(NO3)2(aq) + K2S(aq) -> NiS(s) + 2KNO3(aq)

a. The reaction is a double displacement
b. A precipitate is formed
c. The reactants are ionic compounds
d. The products are ionic compounds

Respuesta :

Bladerunner1976
1 is B (Just remember to have the same number of atoms on both sides)
2 is B (A precipitate is a solid forming from 2 liquids)

Answer:

For 1: The balanced chemical equation is written above.

For 2: The most important indicator in the following reaction is a precipitate is formed.

Explanation:

  • For 1:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

[tex]A+BC\rightarrow AC+B[/tex]

When bromine gas reacts with sodium iodide, it leads to the formation of sodium bromide and iodine gas. The chemical equation for the above reaction follows:

[tex]Br_2+2NaI\rightarrow 2NaBr+I_2[/tex]

Hence, the balanced chemical equation is written above.

  • For 2:

The common indicators of a chemical change has occurred are:

  • Release of gas from the reaction.
  • Formation of bubbles.
  • Color change
  • Temperature change
  • Formation of a precipitate
  • Specific odor

For the given chemical reaction:

[tex]Ni(NO_3)_2(aq.)+K_2S(aq.)\rightarrow NiS(s)+2KNO_3(aq.)[/tex]

As, the precipitate is being formed, so it is the important indicator for a chemical reaction.

Hence, the most important indicator in the following reaction is a precipitate is formed.

Otras preguntas