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Biblioteka

Enthalpy AS Review

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Posljednje ažuriranje over 1 year ago
3 questions
1
Pitanje 1
1.

Year 12 Enthalpy Specification points

Stavka koja se može prevućiarrow_right_altOdgovarajuća stavka

Standard enthalpy change of formation:

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Enthalpy change when reaction occurs in the molar quantities shown in the chemical equation under standard conditions.

Standard conditions:

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Enthalpy change when 1 mole of a compound is formed

from its elements in their standard states under standard conditions.

Standard enthalpy of neutralisation:

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Enthalpy change when 1 mole of a substance is completely

burned in oxygen under standard conditions.

Enthalpy change:

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Enthalpy change when an acid and alkali react together under

standard conditions to form 1 mole of water.

energy transferred =

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Heat energy change in a reaction at constant pressure (kJmol-1)

Standard enthalpy of combustion:

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100 kPa, 298 K, 1 moldm ​−​3

concentrations of ions. (Note not 1atm)

Standard enthalpy change of reaction:

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mass x specific heat capacity × temperature change

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2
Pitanje 2
2.

1. know that standard conditions are kPa and a specified temperature, usually K

2. know that the enthalpy change is the heat change measured at constant

3. be able to construct and interpret enthalpy level diagrams showing an enthalpy change, including appropriate signs for exothermic () and endothermic () reactions

Note: Activation energy is not shown in level diagrams but it is shown in reaction profile diagrams.

Pitanje 3
3.

Enthalpy change calculation using enthapy of formation.

sign value