4530332
Descripción
Test por Leah Firmstone, actualizado hace más de 1 año
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Creado por Leah Firmstone
hace casi 9 años
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Pregunta 1
Pregunta
Reactions that give out energy - usually in the form of heat - are called...
Respuesta
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...exothermic reactions
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...endothermic reactions
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...redox reactions
Pregunta 2
Pregunta
Reactions that take in energy from the surroundings - usually in the form of heat - are called endothermic reactions.
Respuesta
- True
- False
Pregunta 3
Pregunta
What is 'activation energy'?
Respuesta
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The overall energy change of a reaction.
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The energy needed to start a chemical reaction.
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A measure of the strength of a catalyst.
Pregunta 4
Pregunta
Breaking the chemical bonds in the reactants always [blank_start]requires[blank_end] energy – it is an endothermic process. [blank_start]Making[blank_end] new bonds in the products always releases energy – it is an exothermic process.
If more energy is [blank_start]released[blank_end] when new bonds are made than was absorbed to [blank_start]break[blank_end] the bonds in the reactants, then the reaction is [blank_start]exothermic[blank_end].
If [blank_start]less[blank_end] energy is released when new bonds are made than was absorbed to break the bonds in the [blank_start]reactants[blank_end], then the reaction is [blank_start]endothermic[blank_end].
Respuesta
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requires
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Making
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exothermic
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endothermic
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released
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break
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less
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reactants
Pregunta 5
Pregunta
The diagram shows an endothermic reaction.
Respuesta
- True
- False
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