IB Chemistry Topic R1.1.3 Energy Profiles Revision Notes (SL/HL)

IB Chemistry Topic R1.1.3 Energy Profiles Revision Notes (SL/HL) | RevisionDojo

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Bond Breaking, Bond Making, and the Energy Balance

Every reaction breaks bonds in the reactants and forms new bonds in the products.
Breaking bonds absorbs energy, while forming bonds releases energy.
The overall energy change depends on the balance: if forming bonds releases more energy than breaking bonds absorbs, the reaction is exothermic; if it releases less, the reaction is endothermic.

Relative Stability: Lower Energy Means More Stable

Think of reactants and products as vessels holding chemical potential energy.
1. If the products hold less energy than the reactants, the excess energy is released, giving an exothermic reaction.
2. If the products hold more energy, the reaction absorbs energy from the surroundings, making it endothermic.
Stability and energy are inversely related.
1. Molecules at lower energy levels are more stable; those at higher energy levels are less stable.

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Bond Breaking, Bond Making, and the Energy Balance

Every reaction breaks bonds in the reactants and forms new bonds in the products.
Breaking bonds absorbs energy, while forming bonds releases energy.
The overall energy change depends on the balance: if forming bonds releases more energy than breaking bonds absorbs, the reaction is exothermic; if it releases less, the reaction is endothermic.

Relative Stability: Lower Energy Means More Stable

Think of reactants and products as vessels holding chemical potential energy.
1. If the products hold less energy than the reactants, the excess energy is released, giving an exothermic reaction.
2. If the products hold more energy, the reaction absorbs energy from the surroundings, making it endothermic.
Stability and energy are inversely related.
1. Molecules at lower energy levels are more stable; those at higher energy levels are less stable.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

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Excepteur sint occaecat cupidatat non proident

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Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

IB Chemistry R1.1.3 Energy Profiles Notes

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

Bond Breaking, Bond Making, and the Energy Balance

Relative Stability: Lower Energy Means More Stable

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Bond Breaking, Bond Making, and the Energy Balance

Relative Stability: Lower Energy Means More Stable

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account