Answered

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Substance B was heated at first gently and then more strongly in a bunsen flame. Two gases were given off, one of them brown. A yellow residue remained that neutralised both an acidic and an alkaline solution What is Substance B?

Sagot :

Answer:

The Compound is Zn(NO3)2

Explanation:

When a transition metal nitrate is heated it produces its oxide, NO2, and O2, therefore, in this case producing ZnO, NO2 and O2.

When ZnO is heated, it turns yellow and back to white when cooled, and since we can assume that barely any time passed between the heating and the observation, we can guess that it is zinc.

Another clue is that it says its neutralised by both acidic and alkaline, this is because zinc, like aluminium, is an amphoteric oxide.

pstnonsonjoku

The substance B must be lead II nitrate and the yellow residue is lead II oxide.

Decomposition reaction is a type of chemical reaction in which a substance is broken down into its constituents. The decomposition of lead II nitrate yields, lead II oxide, nitrogen IV oxide and oxygen gas.

The equation for the decomposition of lead II nitrate is; 2Pb(NO3)2 ------>  2PbO + 4NO2 + O2. The substance B must be lead II nitrate and the yellow residue is lead II oxide.

Learn more about decomposition reaction: https://brainly.com/question/24936069

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