State Change Quiz

Froggy Jumps

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Phase changes and enthalpies

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Nimisha Nisanth

United Arab Emirates

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State Change Quiz


Froggy Jumps State Change QuizVersion en ligne Phase changes and enthalpies par Nimisha Nisanth 1 What best defines a phase change in a substance? a A physical state change with no new substance formed b A chemical reaction that forms new bonds c A change in temperature only without a state change 2 Between fusion and vaporization, which enthalpy is larger? a Fusion enthalpy (ΔHfus) b Vaporization enthalpy (ΔHvap) c Both are the same 3 Why does temperature stay constant during a phase change on a heating curve? a Energy changes the intermolecular forces, not temperature b Temperature stays constant for all heat inputs c Energy changes the chemical composition 4 Why is ΔHfus typically smaller than ΔHvap? a Fewer bonds must be overcome to melt than to vaporize b Fusion involves chemical reaction rather than phase change c Vaporization creates new bonds 5 What is molar enthalpy of fusion? a Energy to vaporize one mole b Energy required to melt one mole at melting point c Energy to heat one mole by 1°C 6 How do you compute heat absorbed during fusion for a given mass? a Heat = n × ΔHfus (moles × enthalpy of fusion) b Heat = m × Cp × ΔT c Heat = n × ΔHvap (moles × enthalpy of vaporization) 7 During melting, why does added energy go into structure rather than temperature? a Because phase change absorbs energy as latent heat b Because it is an irreversible reaction c Because kinetic energy increases instantly 8 What does a larger ΔHfus imply about intermolecular forces? a Weaker forces in solid b Stronger intermolecular forces in the solid c No relation to forces 9 What is heat capacity? a Amount of heat needed to raise temperature by 1°C b Energy required to melt a substance c Energy released when gas forms 10 Why is water’s high specific heat capacity important? a It moderates climate by absorbing heat with small temperature change b It makes water conduct electricity better c It causes water to evaporate instantly

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State Change Quiz

Froggy Jumps

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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State Change QuizVersion en ligne

par Nimisha Nisanth

What best defines a phase change in a substance?

Between fusion and vaporization, which enthalpy is larger?

Why does temperature stay constant during a phase change on a heating curve?

Why is ΔHfus typically smaller than ΔHvap?

What is molar enthalpy of fusion?

How do you compute heat absorbed during fusion for a given mass?

During melting, why does added energy go into structure rather than temperature?

What does a larger ΔHfus imply about intermolecular forces?

What is heat capacity?

Why is water’s high specific heat capacity important?