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Chemistry Module 3 > 9.1 Enthalpy changes > Flashcards

9.1 Enthalpy changes Flashcards

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1
Q

what is enthalpy?

A

measure of heat energy in a chemical system

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2
Q

what is a chemical system?

A

the atoms, molecules and ions which make up chemicals

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3
Q

enthalpy equation

A

H(products) - H(reactants)

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4
Q

what is energy transferred between?

A

the system and the surroundings

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5
Q

what are the two types of energy change?

A

exothermic
endothermic

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6
Q

exothermic

A

energy transferred from the

SYSTEM to the SURROUNDING

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7
Q

endothermic

A

energy transferred from the

SURROUNDING to the SYSTEM

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8
Q

outline exothermic change

A

chemical system releases heat energy to the surroundings

ΔH is negative

temperature of the surroundings increase

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9
Q

outline endothermic change

A

chemical system takes in heat energy from the surroundings

ΔH is positive

temperature of the surroundings falls

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10
Q

outline endothermic change

A

chemical system takes in heat energy from the surroundings

ΔH is positive

temperature of the surroundings decreases

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11
Q

what is the activation energy?

A

the minimum energy required for a reaction to take place

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12
Q

enthalpy profile for an exothermic reaction

A
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13
Q

enthalpy profile for an endothermic reaction

A
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14
Q

what are standard conditions?

A

100 kPa
298K
1 mol dm-3
standard state

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15
Q

what is the enthalpy change of reaction?

A

energy change when reactants and products react in the molar quantities shown in an equation under standard conditions

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16
Q

what is enthalpy change of formation?

A

energy required for one mole of a compound to be formed from its elements under standard state and conditions

17
Q

what is enthalpy change of combustion?

A

energy required for one mole of substance to react completely with oxygen under standard state and conditions

18
Q

what is enthalpy change of neutralisation?

A

energy change when an acid reacts with a base to form one mole of water under standard state and conditions

Chemistry Module 3 (17 decks)

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