Enthalpy (HSC SSCE Chemistry): Quizzes

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Enthalpy
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What does enthalpy primarily measure in a substance?

Chemical energy held in bonds

What does the symbol Δ\Delta represent in chemistry?

Change in (final state minus initial)

What is the sign of ΔH\Delta H for an endothermic reaction?

Positive (ΔH>0\Delta H > 0)

In an exothermic reaction, how do products compare to reactants?

Products have less energy

Why must we specify 'per mole of which substance' when stating ΔH\Delta H values?

Equations can be written in different amounts

Why must physical states be indicated in equations involving energy changes?

Changes of state involve energy changes

What does molar enthalpy of solution (ΔHsoln\Delta H_{\text{soln}}) represent?

Heat absorbed when 1 mol dissolves in water

How do ionic substances dissolve in water?

By dissociation into separate ions

Which formula is used to calculate heat absorbed or released in calorimetry?

q=mcΔTq = mc\Delta T

What is the typical specific heat capacity assumed for aqueous solutions in calorimetry?

4.18×1034.18 \times 10^3 J K−1^{-1} kg−1^{-1}

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