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Chemistry > Module 3 > Flashcards

Module 3 Flashcards

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1
Q

What is enthalpy?

A

The thermal energy that is stored in a chemical system

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2
Q

What is activation energy?

A

The minimum energy required to start a reaction by breaking bonds in the reactants

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3
Q

What are standard conditions?

A

100kPa

278 K

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4
Q

What is the enthalpy change of reaction?

A

Energy change associated with a given reaction

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5
Q

What is the enthalpy change of formation?

A

Energy change that takes place when 1 mole of a compound is formed from its constituent elements in their standard state under standard conditions

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6
Q

What is the enthalpy change of combustion?

A

The energy change that takes place when 1 mole of substance is completely combusted

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7
Q

What is the enthalpy change of neutralisation?

A

Energy change associated with the formation of 1 mole of water from a neutralisation reaction

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8
Q

What is specific heat capacity?

A

Energy required to raise the temperature of 1g of a substance by 1K

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9
Q

What is calorimetry?

A

Quantitive study of energy in a chemical reaction

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10
Q

Breaking bonds is what kind of reaction?

A

Endothermic

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11
Q

Forming bonds is what kind of reaction?

A

Exothermic reaction

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12
Q

What is average bond enthalpy?

A

Mean energy needed for 1 mole of a given type of gaseous bonds to undergo homolytic fission

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13
Q

Why is it difficult to measure enthalpy change for incomplete combustion?

A

There is often complete and incomplete combustion happening simultaneously

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14
Q

What does Hess’ law state?

A

The enthalpy change in a chemical reaction is independent of the route it takes

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15
Q

What is the equation for rate of reaction?

A

Rate = Change in concentration
————————-
Time

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16
Q

What are the factors affecting rate of reaction?

A 
Temperature 
Pressure
Concentration 
Surface area 
Adding catalyst

Chemistry (16 decks)

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