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Exam (elaborations)

BTEC Unit 5 Applied science level 3 Chemistry with verified solutions

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BTEC Unit 5 Applied science level 3 Chemistry with verified solutions

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BTEC Unit 5 Applied science
level 3 Chemistry with
verified solutions

chemical energy - Correct answer ✔the energy required to break or make bonds
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exothermic reaction - Correct answer ✔A reaction that releases more energy in the form of heat
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what is the enthalpy change of an exothermic reaction - Correct answer ✔negative
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endothermic reaction - Correct answer ✔A reaction in which more energy is absorbed
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what is the enthalpy charge of an endothermic reaction - Correct answer ✔positive
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what will happen to the enthalpy diagrams when a catalyst is added - Correct answer ✔less
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activation energy will be required during this reaction
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enthalpy change - Correct answer ✔the change n eat energy at a constant pressure
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Enthalpy change of formation - Correct answer ✔when one mole of a compound is formed from its
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element under standard conditions
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enthalpy change of combustion - Correct answer ✔when one mole of a substance is burnt in
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oxygen under standard conditions
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, enthalpy change of hydration - Correct answer ✔when one mole of a gaseous ion are dissolved in
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water to make an infinite dilute solution
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what are the three standard conditions - Correct answer ✔temperature
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concentration

pressure



what are the units for the three standard conditions - Correct answer ✔temperature- 298k
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concentration- 1mol dm-3 |||||| ||||||




pressure- 100kpa ||||||




what is the equation for enthalpy change - Correct answer ✔change in internal energy + pressure x
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change in value |||||| ||||||




how o you convert Celsius to kelvin - Correct answer ✔+ 273
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What is a catalyst? - Correct answer ✔a substance that speeds up the rate of reaction by
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decreasing the activation energy needed for the reaction, so it provides the reaction with an
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alternate pathway. the catalyst is never used up throughout the reaction
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What is Hess's Law? - Correct answer ✔The total enthalpy change of a reaction is independent of
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the route taken.
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What is lattice energy? - Correct answer ✔the energy required to make one mole of an ionic lattice
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what is the homologous series? - Correct answer ✔A group of chemicals that react in a similar way
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because they have the same functional group |||||| |||||| |||||| |||||| |||||| ||||||




what type of bond is an alkane? - Correct answer ✔single
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what type of bond is an alkene? - Correct answer ✔Double
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