Q1
A system that can exchange both energy and matter with its surroundings is called:
📝 SolutionAn open system exchanges both matter and energy with its surroundings, e.g. an open beaker of water.
Q2
The first law of thermodynamics is a statement of the conservation of:
📝 SolutionThe first law of thermodynamics is essentially the law of conservation of energy: energy can be transformed but not created or destroyed.
Q3
In an isolated system, there is no exchange of:
📝 SolutionAn isolated system exchanges neither matter nor energy with its surroundings, e.g. an ideal thermos flask.
Q4
The heat change at constant pressure is measured as change in:
📝 SolutionAt constant pressure, the heat exchanged equals the change in enthalpy ($\Delta H$).
Q5
For an exothermic reaction, the value of $\Delta H$ is:
📝 SolutionIn an exothermic reaction heat is released, so the enthalpy of products is lower than reactants, making $\Delta H$ negative.
🔔 Don't miss tomorrow's DPP!
Get a new DPP every morning, straight to WhatsApp — free.
📱 Get DPP on WhatsApp
Class 11 · Chemistry
Fully prepared for the board exam?
Check out Alpha Classes' Exam Kits — notes, PYQs, mock tests and much more.
View Exam Kits →