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a level chemistry > module 3 section 2 - physical chemistry > Flashcards

module 3 section 2 - physical chemistry Flashcards

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1
Q

Draw a reaction profile for an endothermic reaction

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2
Q

Draw a reaction profile for an exothermic reaction

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3
Q
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4
Q

What is the symbol for standard conditions

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5
Q

What is the symbol for enthalpy change under standard conditions

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6
Q

What are standard conditions ? (4)

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7
Q

What is the symbol for enthalpy change of a reaction ?

A
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8
Q

Show the equation for the enthalpy change of the reaction for magnesium

A
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9
Q

Show the balanced equation for the enthalpy change of the reaction for aluminium including state symbols

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10
Q

What is the symbol for standard enthalpy of combustion

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11
Q

Show the balanced equation for the standard enthalpy of combustion of the reaction of butane including state symbols

A
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12
Q

What is the symbol for standard enthalpy change of formation

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13
Q

Show the balanced equation for the standard enthalpy change of formation of water, include state symbols

A
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14
Q

Show the balanced equation for the standard enthalpy change of formation of carbon dioxide , include state symbols

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15
Q

Show the balanced equation for the standard enthalpy change of formation of magnesium sulfate , include state symbols

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16
Q

What is the symbol for enthalpy change of neutralisation

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17
Q

Show the balanced equation for the enthalpy change of neutralisation for the reaction between hydrochloric acid and sodium hydroxide include state symbols

A
18
Q

Compare and contrast the enthalpy of products and reactants in an exothermic reaction (2)

A
  • enthalpy of products is lower
  • than enthalpy change of reactants
19
Q

Compare and contrast the enthalpy of products and reactants in an endothermic reaction (2)

A
  • enthalpy of products is higher
  • than enthalpy change of reactants
20
Q

What is an exothermic reaction (1)

A
  • give out energy
  • enthalpy change is negative
21
Q

What is an endothermic reaction (2)

A
  • absorb energy
  • enthalpy change is positive
22
Q

What happens to temperature in ectothermic reactions ? (1)

A
  • temp increases
23
Q

What happens to temperature in endothermic reactions (1)

A
  • temp decreases
24
Q

Name 2 exothermic reactions (2)

A
  • combustion of fuel eg methane
  • oxidation of glucose in resp
25
Q

Name 2 endothermic reactions (2)

A
  • thermal decomposition of calcium carbonate
  • PSM
26
Q

What do enthalpy profile diagrams show (2)

A
  • how enthalpy changes
  • during a reaction
27
Q

What is activation energy (3)

A
  • minimum amount of energy
  • needed to begin breaking reactant bonds
  • to start a chemical reaction
28
Q

Describe the stability of a substance in terms of enthalpy (2)

A
  • less enthalpy
  • = more stable
29
Q

In what ways can you find enthalpy changes ? (2)

A
  • experiment
  • data books
30
Q

Are products or reactants more stable in an endothermic reaction, explain your answer (2)

A
  • reactants
  • have less enthalpy
31
Q

Are products or reactants more stable in an exothermic reaction, explain your answer (2)

A
  • products
  • have less enthalpy
32
Q

Is 🔼H positive or negative in an endothermic reaction ?

A

Positive

33
Q

Is 🔼H positive or negative in an exothermic reaction ?

A

Negative

34
Q

Explain why 🔼H is positive in an endothermic reaction (2)

A
  • energy absorbed
  • to break bonds
35
Q

Explain why 🔼H is negative in an exothermic reaction (2)

A
  • energy released
  • when bonds are formed
36
Q

What 2 things do u need to know to measure enthalpy change for a reaction ? (2)

A
  • number of moles of substance reaction
  • change in temp
37
Q

What equation can be used to calculate enthalpy changes

A

q = mc🔼T

38
Q

What is q in the equation q=mc🔼t

A

Heat lost or gained

39
Q

What is m in the equation q=mc🔼t

A

Mass of water

40
Q

What is c in the equation q=mc🔼t

A
  • specific heat capacity of water
  • 4.18 J g-1 k-1
41
Q

What is 🔼T in the equation q=mc🔼t

A
  • change in temp of water or solution

a level chemistry (9 decks)

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