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Chemistry 3 > Enthalpy > Flashcards

Enthalpy Flashcards

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1
Q

Is bond breaking exothermic or endothermic?

A

Endothermic

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2
Q

Is bond making exothermic or endothermic?

A

Exothermic

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3
Q

What does exothermic mean?

A

More energy is being released than there is going into the reaction

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4
Q

What does endothermic mean?

A

More energy goes into the reaction than there is going out of the reaction

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5
Q

What is the enthalpy change of heat in an endothermic reaction?

A

Positive

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6
Q

What is the enthalpy change of heat in an exothermic reaction?

A

Negative

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7
Q

What is the enthalpy change of heat?

A

The overall energy change in a reaction

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8
Q

What is the enthalpy change of formation?

A

The energy change when 1 mole of a substance is made from its constituent element in their standard state

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9
Q

What is the standard state for temperature?

A

25 degrees celsius / 298K

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10
Q

What is the standard state for pressure?

A

1 atm / 100KPa

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11
Q

What is the standard state for a solution?

A

1 mol/dm3

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12
Q

What is the standard state for moles?

A

1 mol

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13
Q

What is the equation for the enthalpy change of reaction in a formation reaction?

A

Enthalpy of a reaction = sum of products - sum of reactants

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14
Q

What happens if the element is on its own in an enthalpy of formation reaction?

A

It is 0

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15
Q

What is the enthalpy change of combustion?

A

The energy change when 1 mole of a substance is completely combusted at RTP

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16
Q

What is the equation for the enthalpy change of reaction in a combustion reaction?

A

Enthalpy of a reaction = sum of reactants - sum of products

17
Q

What is Hess’s law?

A

When you use a mixture of combustion and formation enthalpies to find the overall enthalpy of an equation

18
Q

What is specific heat capacity?

A

The energy needed to heat up 1 kg of a substance by 1 degree

19
Q

What is a system?

A

The chemical reaction in the atoms and bonds

20
Q

Is the line for reactants higher or lower than the products in an enthalpy reaction that is exothermic?

A

Lower

21
Q

Is the line for reactants higher or lower than the products in an enthalpy reaction that is endothermic?

A

Higher

22
Q

What is activation energy?

A

The minimun energy required to start a reaction

23
Q

What is the enthalpy change of a reaction?

A

The energy change associated with any given reaction

24
Q

What is the enthalpy change of combustion?

A

The enthalpy change where 1 mol of water is produced by neutralisation at STP

Chemistry 3 (6 decks)

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