Question

when two substance X and Y were made to combine another substance Z was formed follwing observation were recorded a Large amount of heat was evolved when X and Y were made to combine . b The properties of Z were found to be different from those of X and Y. predict the nature of substance Z​

Answer 1

Answer:

Z is a compound of X and Y as it has properties different from that of X and Y.

Z has lesser energy compared to that of X and Y as the reaction is exothermic.

Hope it helps u

Answer 2

Solutìon :

In the given reaction :

$\sf\:X+Y\rightarrow\:Z$

Observation were recorded as follows :

• Large amount of heat was evolved when X and Y combine.
• The properties of Z were found to be different from those of X and Y.

We have to predict the Nature of compound Z.

Nature of compound z :

• It is formed by combination reaction.then Z has leser energy than X and Y
• Since ,large amount of energy evolved when X and Y combine ,so it's exothermic reaction. For exothermic reactions , Enthalpy $\sf\triangle\:H=-ve$

$\rule{200}2$

More About the topic :

Exothermic reactions:

Those reactions in which heat is evolved are known as exothermic.

Example :

• Burning of Natural gas

$\sf\:CH_4(g)+2O_2\rightarrow\:CO_2(g)+2H_2O+Heat\:energy$

• Respiration etc.