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A-Level Chemistry > Energetics > Flashcards

Energetics Flashcards

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1
Q

What is the definition of enthalpy?

A

A measure of the heat content of a substance

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2
Q

What is the definition of enthalpy change?

A

The energy change at a constant pressure

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3
Q

What is the definition of endothermic?

A

A reaction where at the end of the reaction, energy has been taken in.

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4
Q

What is the definition of exothermic?

A

A reaction where at the end of the reaction, energy has been given out.

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5
Q

What is the definition of activation energy?

A

The minimum amount of kinetic energy that particles need to react

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6
Q

What is the definition of standard enthalpy of formation?

A

The enthalpy change when 1 mole of a compound is formed from its elements with all substances in standard states under standard condition

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7
Q

What is the definition of standard enthalpy of combustion?

A

The enthalpy change when 1 mole of a compound is completely burnt in oxygen under standard conditions and all the reactants and products in their standard states

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8
Q

What is the definition of standard enthalpy of reaction?

A

The enthalpy change for a reaction with the quantities shown in the chemical equation. this means that the value should always be quoted along with the equation

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9
Q

What is the definition of standard enthalpy of neutralisation?

A

The enthalpy change when 1 mole of water is formed in a reaction between an acid and alkali under standard conditions

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10
Q

What is the definition of specific heat capacity?

A

The amount of heat energy it takes to raise the temperature of 1g of a substance by 1 degrees C

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11
Q

What is the equation to calculate the energy change?

A

Energy change = massspecific heat capacitychange in temperature

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12
Q

How do you calculate the heat produced?

A

Heat = energy change/moles

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13
Q

How do you calculate the number of moles?

A

Number of moles = mass/Mr

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14
Q

What is Hess’s Law?

A

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

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15
Q

How can you calculate the overall enthalpy changes from enthalpy changes of formation?

A

Enthalpy change = Sum(change in the enthalpy of formation of products) - Sum(change in the enthalpy of formation of reactants

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16
Q

What is the enthalpy of formation of all elements?

A

0

17
Q

How can you calculate the overall enthalpy changes from enthalpy changes of combustion?

A

Enthalpy change = Sum(change in the enthalpy of combustion of reactants) - Sum(change in the enthalpy of combustion of products)

A-Level Chemistry (30 decks)

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