ThermoChem Challenge: Grade 12

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Thermochemistry quiz on systems, heat flow, and enthalpy.

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Pina Sibarani

Indonesia

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ThermoChem Challenge: Grade 12


Froggy Jumps ThermoChem Challenge: Grade 12Versión en línea Thermochemistry quiz on systems, heat flow, and enthalpy. por Pina Sibarani 1 What best defines the system in thermochemistry? a The surroundings (everything else in the universe). b The container holding the substances. c The part of the universe being studied (e.g., reacting substances). 2 Which system exchanges energy but not matter with its surroundings? a Open system. b Closed system. c Isolated system. 3 Which type of process releases heat to the surroundings? a Exothermic process. b Endothermic process. c Adiabatic process. 4 Which is an endothermic process example? a Melting ice (ice absorbs heat). b Combustion of wood. c Condensation of steam. 5 What does ΔH represent in a thermochemical equation? a Total energy of the system. b Enthalpy change of the reaction. c Temperature change of the surroundings. 6 What is enthalpy of formation (ΔHf°)? a Enthalpy change to form 1 mole from elements in standard states. b Enthalpy change for combusting a substance. c Enthalpy change for dissolving a substance. 7 What is enthalpy of combustion? a ΔH for neutralization. b ΔH for burning 1 mole of a substance in O2. c ΔH for formation of 1 mole. 8 What is enthalpy of neutralization? a Heat released when a metal corrodes. b Heat released when an acid and base form water. c Heat absorbed when a salt dissolves. 9 What is enthalpy of solution? a Heat of vaporization. b Heat change when a solute dissolves in a solvent. c Heat change during a phase change. 10 If a thermochemical equation is multiplied by 3, what happens to ΔH? a ΔH becomes 3 times larger. b ΔH stays the same. c ΔH becomes negative. 11 Which is the correct thermochemical equation for the combustion of hydrogen? a H₂(g) + ½O₂(g) → H₂O(l); ΔH = -286 kJ b H₂(g) + O₂(g) → H₂O(g); ΔH = +286 kJ c H₂(g) → H₂O(l); ΔH = -286 kJ 12 In a thermochemical equation, doubling the coefficients will: a Double the ΔH b Keep ΔH the same c Change the sign of ΔH 13 The enthalpy of neutralization refers to: a Heat released when one mole of water is formed in acid–base reaction b Heat absorbed when salt dissolves in water c Heat released when a compound burns in oxygen 14 Dissolving NH₄Cl in water feels cold to the touch. This process is: a Endothermic b neutralizatio c exothermic 15 Which of the following is an example of exothermic reaction? a Combustion of propane b Melting of ice c Photosynthesis

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ThermoChem Challenge: Grade 12

Froggy Jumps

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Creada por

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ThermoChem Challenge: Grade 12Versión en línea

por Pina Sibarani

What best defines the system in thermochemistry?

Which system exchanges energy but not matter with its surroundings?

Which type of process releases heat to the surroundings?

Which is an endothermic process example?

What does ΔH represent in a thermochemical equation?

What is enthalpy of formation (ΔHf°)?

What is enthalpy of combustion?

What is enthalpy of neutralization?

What is enthalpy of solution?

If a thermochemical equation is multiplied by 3, what happens to ΔH?

Which is the correct thermochemical equation for the combustion of hydrogen?

In a thermochemical equation, doubling the coefficients will:

The enthalpy of neutralization refers to:

Dissolving NH₄Cl in water feels cold to the touch. This process is:

Which of the following is an example of exothermic reaction?