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Chemistry

GCSE · Edexcel

QuestionsFlashcards

Group 1
- Group 1 (Alkali Metals)
  6
- Group 1: Reactivity & Electronic Configurations
  6
Group 7
Group 0

Qualitative Analysis: Tests for Ions
Hydrocarbons
Polymers
Alcohols & Carboxylic Acids
Bulk & Surface Properties of Matter Including Nanoparticles
- Nanoparticles
  7
- Ceramics, Polymers, Composites & Metals
  5

Bonds & Energy Changes Flashcards

All 6 cards in this deck

Is the breaking of bonds exothermic or endothermic?: Endothermic — energy must be taken in (absorbed) to break bonds.
Is the making of bonds exothermic or endothermic?: Exothermic — energy is released (given out) when bonds are formed.
In terms of bond breaking and bond making, when is a reaction overall exothermic?: When more heat energy is released in forming the bonds in the products than is required to break the bonds in the reactants.
In terms of bond breaking and bond making, when is a reaction overall endothermic?: When less heat energy is released in forming the bonds in the products than is required to break the bonds in the reactants.
True or false? Energy is released when a chemical bond is broken.: False. Breaking a bond absorbs energy; energy is only released when new bonds are made.
True or false? In an endothermic reaction the energy needed to break the reactant bonds is greater than the energy released when the product bonds form.: True. That is why heat energy is taken in overall.