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chemistry (paper one) > energetics / enthalpy (topic 5) > Flashcards

energetics / enthalpy (topic 5) Flashcards

1
Q

what does arrow C represent

A

overall energy change

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2
Q

draw the structure of butane C4H10 to show all the covalent bonds

A
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3
Q

(2C4H10 + 13O2 -> 8CO2 +10H2O)

A
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4
Q

calculate the energy released when all the bonds in the products are formed
(2C4H10 + 13O2 -> 8CO2 +10H2O)

A
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5
Q

(exothermic)

A
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6
Q

write a balanced chemical equation for the reaction between magnesium and hydrochloric acid (HCl) to form magnesium chloride and hydrogen

A
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7
Q

the reaction results in energy being transferred to the surroundings, draw a reaction profile for the reaction between magnesium and hydrochloric acid

A
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8
Q

reaction between methane and steam to produce hydrogen, write a balanced symbol equation for the reaction between methane and steam, include state symbols

A
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9
Q

(CH4(g) + H2O(g) ⇋ 3H2(g) + CO(g))

A
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10
Q

complete the reaction profile for the reaction between methane and steam to form hydrogen and carbon monoxide

A
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11
Q

the reaction is reversible, state the effect of increasing the temperature on the yield of hydrogen (2)

A
  • increasing the temperature would favour the endothermic forward reaction
  • increasing the yield of hydrogen

(increase in temperature would cause a shift in the endothermic direction, position of the equilibrium would shift to the left, towards the reactants, cause an increase in the concentration of reactants and a decrease in the yield of products)

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12
Q

state what is meant by the term activation energy

A

the minimum energy needed for the reaction to take place

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13
Q

sketch the structure of propane to show all the covalent bonds

A
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14
Q

write a balanced symbol equation for the combustion of propane

A
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15
Q

(C3H8 + 5O2 → 3CO2 + 4H2O) (4)

A
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16
Q

describe the pattern shown by the student’s results and explain how this shows the trend in reactivity as you go down group 1 (2)

A
  • as you go down group 1, the temperature rise increases
  • showing reactivity increases (as you go down group 1)
17
Q

how has this student incorrectly drawn the reaction profile for an exothermic reaction (2)

A
  • the reaction profile shows an endothermic reaction (or energy of products should be lower than the energy of reactants)
  • activation energy labelled incorrectly (activation energy arrow should start at the level of the reactants not the products)
18
Q

propane formula

A

C₃H₈

chemistry (paper one) (24 decks)

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