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Chemistry 9701 > Enthalpy Changes > Flashcards

Enthalpy Changes Flashcards

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1
Q

What does the First Law of Thermodynamics state?

A

Energy can neither be destroyed nor created but it can be converted from one form to another

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2
Q

Examples of exothermic reactions?

A

Combustion
Respiration

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3
Q

Examples of endothermic reactions?

A

Photosynthesis
Thermal decomposition

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4
Q

Define enthalpy

A

Measure of the heat content of a substance at constant pressure

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5
Q

How do you calculate enthalpy change?

A

Enthalpy of products - Enthalpy of reactants

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6
Q

Exothermic is what type of enthalpy?

A

Negative

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7
Q

Endothermic is what type of enthalpy?

A

Positive

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8
Q

A substance under the conditions of 100kPa and 298K is said to be in what state?

A

Its standard state

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9
Q

Define Standard Enthalpy of formation

A

The enthalpy change when one mole of a compound is formed in its standard state from its elements in their standard states

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10
Q

Standard enthalpy of formation is usually endothermic or exothermic?

A

Exothermic

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11
Q

Define Standard enthalpy of combustion

A

The enthalpy change when one mole of a substance undergoes complete combustion under standard conditions

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12
Q

Is standard enthalpy of combustion endorhermic or exothermic?

A

Exothermic

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13
Q

Define enthalpy of neutralization

A

The enthalpy change when one mole of water is formed from its ions in dilute solution

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14
Q

Is enthalpy of neutralisation endothermic or exothermic?

A

Exothermic

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15
Q

Define enthalpy of atomisation

A

The enthalpy change when a substance in its standard state is totally separated into one mole of gaseous atoms

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16
Q

Is enthalpy of atomisation endothermic or exothermic?

A

Endothermic

17
Q

What is bond dissociation enthalpy?

A

The energy required to break one mole of covalent bonds to form gaseous atoms

18
Q

Define lattice formation enthalpy

A

The enthalpy change when one mole of a substance in a lattice is formed in its gaseous ions

19
Q

Define enthalpy of solution

A

The enthalpy change when one mole of an ionic substance dissolves completely in water to give a solution of infinite dilution

20
Q

Define enthalpy of hydration

A

The enthalpy change when one mole of gaseous ions dissolves in water to give a solution of infinite dilution

Chemistry 9701 (10 decks)

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