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Frage 1
Frage
Is an exothermic reaction, is heat given out to the surroundings or taken in heat to the surroundings?
Antworten
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given out
-
taken in
Frage 2
Frage
What symbol is used to show an endothermic reaction?
Antworten
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+
-
-
Frage 3
Frage
Do reactants have more or less chemical energy than products in an exothermic reaction?
Antworten
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more
-
less
Frage 4
Frage
Enthalpy change is the heat change at a constant temperature
Antworten
- True
- False
Frage 5
Frage
in enthalpy changes why are standards used?
Antworten
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so it doesnt affect the amount of energy of the reation taken which can affect the temp
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so it doesnt affect the amount of energy of the reation lost which can affect the temp
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the standard enthaply change measured depends on the reaction not on the conditions
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so it doesnt affect the amount of energy of the reation created which can affect the temp
Frage 6
Frage
What are calorimeters designed for?
Antworten
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to contain reactions where all the heat produced can be exchanged with the surroundings in a measurable and accurate way
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to contain reactions where all the energy produced can be lost to the surroundings in a measurable and accurate way
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to start reactions, providing energy which can be exchanged with the surroundings in a measurable and accurate way
Frage 7
Frage
What is the equation for heat produced?
Antworten
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Heat produced= mass x specific heat capacity of water x temp rise
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Heat produced= mass x specific heat capacity of water /temp rise
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Heat produced= mass / specific heat capacity of water x temp rise
Frage 8
Frage
How do you convert J to KJ?
Antworten
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/ 1000
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x 1000
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/ 10000
Frage 9
Frage
what are errors in calorimetry?
Antworten
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heat loss to the surroundings, by the apparatus, to the solid reactant
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the concentration/ volume of the measurement
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incomplete reaction
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impure reactants
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timings
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inaccurate stirring
Frage 10
Frage
How do you work out percentage error?
Antworten
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(difference between my value and true value/ true value) x 100
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(difference between my value and true value/ true value) x 1000
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( true value/ difference between my value and true value) x 100
Frage 11
Frage
How do you convert q to ^_H?
Antworten
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^_= q / no. moles
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^_= no. moles / q
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^_= q x no.moles
Frage 12
Frage
How do you convert q to ^_H?
Antworten
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^_= q / no. moles
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^_= no. moles / q
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^_= q x no.moles
Frage 13
Frage
What is the definition of standard enthalpy change?
Antworten
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when 1 mole of compound is formed from its constituent elements under standard conditions with all substances in their standard states
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normal states, stable under standard conditions
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heat change at a constant pressure
Frage 14
Frage
sodium hydroxide reacts with HCL and the container becomes really quite warm- what kind of reaction is this?
Antworten
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endothermic
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exothermic
Frage 15
Frage
What is another name for the conservation of energy?
Antworten
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Hess' Law
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Boyle's Law
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Heis' Law
Frage 16
Frage
what kind of working out would you have to use to work out ^_H implying Hess' law
Antworten
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enthalpy cycles
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mechanisms
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equations
Frage 17
Frage
In bond enthalpies bonds broken is an exothermic reaction
Antworten
- True
- False
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