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4
1+3.
Class 10 · Bangla Version · Chemistry
Reactions, acids, bases and salts
Predict an equilibrium response while separating concentration from rate.
Original Kidemy further-topic investigation. This optional lesson is shared by related upper pathways; select suitable depth with a teacher. It does not certify complete grade or board coverage.
Learn the idea
An equilibrium response is evaluated under specified changes and conditions. Adding a reactant changes the reaction quotient. At fixed temperature the equilibrium constant stays the same; the composition can shift until the ratio again matches it. A catalyst changes the approach rate rather than K.
Worked example
For N2+3H2⇌2NH3, compression at fixed temperature favours the side with fewer gas moles in the ideal model:2 product moles versus4 reactant moles. This direction alone does not quantify the yield.
- Write the equilibrium and gas counts.
- State the imposed change.
- Separate position, constant and rate.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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2
The NH3 coefficient is 2.
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unchanged
It changes rates, not the equilibrium constant.
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The product side has fewer gas moles; the system changes composition toward that side under the imposed volume decrease.
State fixed temperature and gaseous species.
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The initial composition, equilibrium constant and extent conditions are also needed.
Distinguish direction from magnitude.
Apply the idea
Compare three changes to one equilibrium, stating which quantities remain fixed.
Review with a guardian or teacher
- Use the stated evidence or givens.
- Show reasoning rather than only a result.
- Review and explain one correction.
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