Energy Changes in Chemical Reactions (Grade 11 NSC Matric Physical Sciences): Flashcards

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Energy Changes in Chemical Reactions
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Name for study of energy changes in reactions

Thermochemistry or chemical thermodynamics

Energy change when breaking bonds

Always requires energy

Energy change when forming bonds

Always releases energy

Bond energy

Measure of bond strength; energy to break a bond

Enthalpy (HH)

Total energy of chemical system at given pressure

Exothermic reaction

Releases energy as heat or light

Endothermic reaction

Absorbs energy as heat or light

Sign of ΔH\Delta H for exothermic reactions

Negative

Sign of ΔH\Delta H for endothermic reactions

Positive

Reaction type when temperature increases

Exothermic

Explore Grade 11 NSC Matric Physical Sciences Revision Notes by Topics

Atomic Combinations

Intermolecular Forces

Ideal Gases

Quantitative Aspects of Chemical Change

Energy and Chemical Change

Types of Reactions

The Lithosphere

Explore Grade 11 NSC Matric Physical Sciences Model Answers by Topics

Atomic Combinations

Intermolecular Forces

Ideal Gases

Quantitative Aspects of Chemical Change

Energy and Chemical Change

Types of Reactions

The Lithosphere

Explore Grade 11 NSC Matric Physical Sciences Quizzes by Topics

Atomic Combinations

Intermolecular Forces

Ideal Gases

Quantitative Aspects of Chemical Change

Energy and Chemical Change

Types of Reactions

The Lithosphere

Explore Grade 11 NSC Matric Physical Sciences Exam Questions by Topics

Atomic Combinations

Intermolecular Forces

Ideal Gases

Quantitative Aspects of Chemical Change

Energy and Chemical Change

Types of Reactions

The Lithosphere

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