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646731
Calorimetry quiz
Descrição
AS-level Chemistry (Energetics) Quiz sobre Calorimetry quiz, criado por s_phie5 em 18-03-2014.
Sem etiquetas
chemistry
energetics
chemistry
energetics
as-level
Quiz por
s_phie5
, atualizado more than 1 year ago
Mais
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Criado por
s_phie5
mais de 10 anos atrás
189
0
0
Resumo de Recurso
Questão 1
Questão
Is an exothermic reaction, is heat given out to the surroundings or taken in heat to the surroundings?
Responda
given out
taken in
Questão 2
Questão
What symbol is used to show an endothermic reaction?
Responda
+
-
Questão 3
Questão
Do reactants have more or less chemical energy than products in an exothermic reaction?
Responda
more
less
Questão 4
Questão
Enthalpy change is the heat change at a constant temperature
Responda
True
False
Questão 5
Questão
in enthalpy changes why are standards used?
Responda
so it doesnt affect the amount of energy of the reation taken which can affect the temp
so it doesnt affect the amount of energy of the reation lost which can affect the temp
the standard enthaply change measured depends on the reaction not on the conditions
so it doesnt affect the amount of energy of the reation created which can affect the temp
Questão 6
Questão
What are calorimeters designed for?
Responda
to contain reactions where all the heat produced can be exchanged with the surroundings in a measurable and accurate way
to contain reactions where all the energy produced can be lost to the surroundings in a measurable and accurate way
to start reactions, providing energy which can be exchanged with the surroundings in a measurable and accurate way
Questão 7
Questão
What is the equation for heat produced?
Responda
Heat produced= mass x specific heat capacity of water x temp rise
Heat produced= mass x specific heat capacity of water /temp rise
Heat produced= mass / specific heat capacity of water x temp rise
Questão 8
Questão
How do you convert J to KJ?
Responda
/ 1000
x 1000
/ 10000
Questão 9
Questão
what are errors in calorimetry?
Responda
heat loss to the surroundings, by the apparatus, to the solid reactant
the concentration/ volume of the measurement
incomplete reaction
impure reactants
timings
inaccurate stirring
Questão 10
Questão
How do you work out percentage error?
Responda
(difference between my value and true value/ true value) x 100
(difference between my value and true value/ true value) x 1000
( true value/ difference between my value and true value) x 100
Questão 11
Questão
How do you convert q to ^_H?
Responda
^_= q / no. moles
^_= no. moles / q
^_= q x no.moles
Questão 12
Questão
How do you convert q to ^_H?
Responda
^_= q / no. moles
^_= no. moles / q
^_= q x no.moles
Questão 13
Questão
What is the definition of standard enthalpy change?
Responda
when 1 mole of compound is formed from its constituent elements under standard conditions with all substances in their standard states
normal states, stable under standard conditions
heat change at a constant pressure
Questão 14
Questão
sodium hydroxide reacts with HCL and the container becomes really quite warm- what kind of reaction is this?
Responda
endothermic
exothermic
Questão 15
Questão
What is another name for the conservation of energy?
Responda
Hess' Law
Boyle's Law
Heis' Law
Questão 16
Questão
what kind of working out would you have to use to work out ^_H implying Hess' law
Responda
enthalpy cycles
mechanisms
equations
Questão 17
Questão
In bond enthalpies bonds broken is an exothermic reaction
Responda
True
False
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