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Cemeg Uned 2 > Thermochemistry > Flashcards

Thermochemistry Flashcards

1
Q

Delta T

A

Temperature Change

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2
Q

To find enthalpy change per mol
Delta H = MC x Delta T / n

A

Enthalpy change

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3
Q

What type of reaction gives out heat?

A

Exothermic reactions

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4
Q

When it Delta H negative?

A

Exothermic reactions

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5
Q

Combustion is an example of what kind of reaction?

A

Exothermic reaction

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6
Q

What type of reactions takes in heat?

A

Endothermic reactions

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7
Q

When is Delta H positive?

A

Endothermic reactions

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8
Q

Decomposition of limestone and photosynthesis are examples of?

A

Endothermic reactions

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9
Q

Standard thermodynamic conditions

A

1 atmosphere pressure (1atm)
Temperature 298K (25*C)
All solutions having a concentration of 1 mol dm-3
Substances present in their standard states at 295K

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10
Q

Triangle means (delta)

A

Change

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11
Q

H means

A

Enthalpy

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12
Q

T means

A

Tempreature

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13
Q

3 types of enthalpy changes

A
  1. Standard enthalpy change of reaction
  2. Standard enthalpy change of combustion
  3. Standard enthalpy change of formation
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14
Q

Enthalpy change of combustion
Endothermic or Exothermic?

A

Exothermic

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15
Q

Hess’ Law

A

The enthalpy change for a reaction is independent of the route taken to achieve the overall change

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16
Q

Energy circles

A

Follow the arrow
Reactants —Products
\ /
Intermediate

17
Q

Enthalpy change of formation

A

Products - Reactions

18
Q

Enthalpy change of combustion

A

Reactants - Products

19
Q

Temperature increases

A

Exothermic

20
Q

Temperature decreases

A

Endothermic

21
Q

Bomb Calorimeter

A

It’s used to accurately determine the enthalpy of combustion of fuels .

Cemeg Uned 2 (2 decks)

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