4530332
Descrição
Quiz por Leah Firmstone, atualizado more than 1 year ago
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Criado por Leah Firmstone
quase 9 anos atrás
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Questão 1
Questão
Reactions that give out energy - usually in the form of heat - are called...
Responda
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...exothermic reactions
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...endothermic reactions
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...redox reactions
Questão 2
Questão
Reactions that take in energy from the surroundings - usually in the form of heat - are called endothermic reactions.
Responda
- True
- False
Questão 3
Questão
What is 'activation energy'?
Responda
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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.
Questão 4
Questão
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].
Responda
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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
Questão 5
Questão
The diagram shows an endothermic reaction.
Responda
- True
- False
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