Question

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

Answer 1

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.

$A+BC\rightarrow AC+B$

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:

$Br_2+2NaI\rightarrow 2NaBr+I_2$

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:

$Ni(NO_3)_2(aq.)+K_2S(aq.)\rightarrow NiS(s)+2KNO_3(aq.)$

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.

Answer 2

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)