Download App

Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
Question
Why in some reactions heat is evolved while some reactions take place only on absorption of heat?
✓

Answer

Every substance has energy stored in it in the form of heat content. If heat content of reactants $\left(H_R\right)$ is greater than that of products $\left(H_p\right)$, heat is evolved. If $H_R<H_p$, heat is absorbed.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "1 Marks Question" from Thermodynamics→Thermodynamics — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

What is AZT? Mention its use in medical science.
→
Write formula for the following compound:
Iron(III) sulphate.
→
Name an ion having psudo inert gas configuration.
→
Arrange LiCI, KCI, NaCl, CsCl in increasing order of ionic character.
→
Can the following reaction,
$\text{Cr}_{2}\text{O}^{2-}_7 + \text{H}_{2}\text{O}\rightleftharpoons 2\text{CrO}^{2-}_{4} + 2\text{H}^{+}$
be regarded as a redox reaction?
→
Complete the following chemical reactions:
$\text{MnO}^-_4(\text{aq})+\text{H}_2\text{O}_2(\text{aq})\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ }$
Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.
→
Write the resonance structures for
$\mathrm{NO}_2$.
→
Write the general formula for alkane series.
→
Write formula for the following compound:
Chromium(III) oxide.
→
What type of solids are separated by fractional crystallisation?
→