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Thermodynamics Definitions

Authored by Wendy Winnard

Chemistry

12th Grade

NGSS covered

Used 19+ times

Thermodynamics Definitions
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12 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Standard enthalpy change of combustion is defined as the enthalpy change when

1 mole of compound is burnt in oxygen.

1 mole of compound is completely burnt in oxygen under standard conditions of 298K and 1 bar.

1 mole of compound is burnt under oxygen at 293K and 1 bar.

1 mole of oxygen is used to burn a compound under standard conditions of 298K and 1 bar.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Standard enthalpy change of neutralisation is defined as the enthalpy change when

1 mole of acid reacts with 1 mole of alkali to form 1 mole of water, under standard conditions of 298K and 1 bar.

1 mole of water is formed in the neutralisation between an acid and an alkali, under standard conditions of 298K and 1 bar.

1 mole of water is formed in the neutralisation between an acid and an alkali, the reaction being carried out in aqueous solution under standard conditions of 298K and 1 bar.

1 mole of acid is neutralised by an alkali to form a salt and water, under standard conditions of 298K and 1 bar.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Bond energy (of dissociation) (BE) is defined as 

the enthalpy change when 1 mole of covalent bonds is broken.

the energy required to break 1 mole of a covalent bond between two atoms in the gaseous state.

the energy required to break covalent bonds between atoms in the gaseous state to form 1 mole of gaseous atoms.

the energy released when 1 mole of covalent bond between two atoms in the gaseous state is formed.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Standard enthalpy change of formation of a substance is defined as

the enthalpy change when 1 mole of the substance is formed from its elements under standard conditions of 298K and 1 bar.

the energy released when 1 mole of the substance is formed from its elements under standard conditions of 298K and 1 bar.

the enthalpy change when 1 mole of elements is used to form a substance under standard conditions of 298K and 1 bar.

the energy released when 1 mole of elements is used to form a substance under standard conditions of 298K and 1 bar.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Standard enthalpy change of hydration

of a substance is defined as the enthalpy change when 1 mole of the substance is dissolved in a large amount of water under standard conditions of 298 K and 1 bar.

of a substance is defined as the enthalpy change when 1 mole of the substance is fully dissolved in water under standard conditions of 298 K and 1 bar.

of an ion is defined as the enthalpy change when 1 mole of ions is dissolved in a large amount of water such that addition of more water produces no further heat change under standard conditions of 298 K and 1 bar.

of an ion is defined as the enthalpy change when 1 mole of gaseous ions is dissolved in a large amount of water such that addition of more water produces no further heat change under standard conditions of 298 K and 1 bar.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Standard enthalpy change of solution is defined as

the enthalpy change when 1 mole of a substance is dissolved in a large amount of solvent under standard conditions of 298 K and 1 bar.

the enthalpy change when 1 mole of an ionic compound is fully dissolved in solvent under standard conditions of 298 K and 1 bar.

the enthalpy change when 1 mole of substance is dissolved in a large amount of solvent such that addition of more solvent produces no further heat change under standard conditions of 298 K and 1 bar. (ie. further dilution has no effect)

the enthalpy change when 1 mole of aqueous ions is formed from the dissolution in a large amount of water such that addition of more water produces no further heat change under standard conditions of 298 K and 1 bar.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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Lattice energy of an ionic solid is defined as

the energy change when 1 mole of the ionic solid is formed from its separate ions.

the heat energy evolved when 1 mole of the ionic solid is formed from its separate gaseous ions.

the energy required to break 1 mole of ionic bonds to form separate ions.

the heat energy required to break 1 mole of ionic bonds to form separate gaseous ions.

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