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- Acid
- Acid anhydride
- Atomic Number
- Addition Polymer
- Addition Polymerization
- Alkane
- Alkane:Reactivity
- Alkene
- Alkyne
- Alcohol
- Amphoteric Oxide or Hydroxide
- Alkalis
- Absolute Temperature
- Atom
- Anode
- Anion
- Addition reaction
- Avogadro's number N
- Avogadro's law
- Atomic mass unit (a.m.u)
- Base
- Bond (Chemical)
- Basicity of an acid, monobasic, dibasic, tribasic
- Bronsted-Lowry's definition of acids and bases
- Boyle's law
- Catalyst
- Carbon-12 scale
- Cathode
- Cation
- Charle's law
- Combined gas equation
- Condensation Polymerization
- Compound
- Conductor (electrical)
- Covalent bond
- Coordinate bond
- Coulomb (C)
- Chemical reaction
- Cracking of alkanes
- Deliquescence
- Deposition
- Delocalized electrons
- Diatomic molecule
- Diffusion
- Dilute acid
- Dilution
- Exothermic reaction
- Endothermic reaction
- Equilibrium
- Efflorescent salt
- Enthalpy (ΔH) of reaction
- Electrolyte
- Electrolysis
- Electroplating
- Element
- Empirical formula
- Faraday's first law of electrolysis
- Formula equation
- Formula unit and formula mass
- Functional group
- Gay-Lussac's law
- Graham's law
- Half-life of radioactive decay
- Half-cell
- Halogenation
- Hard water
- Hardening of vegetable oil
- Hydrogen
- Hydrogen bond
- Hydrated salt
- Hydrocarbon
- Hydrogen ion as a proton
- Hygroscopic salt
- Ion
- Ionic Discharge
- Ionic or electrovalent bond
- Ionic migration
- Ionization energy
- Isotopes
- Le Chartelier's principle
- Markownikoff's rule
- Material
- Mineral
- Mixture
- Mole
- Molarity
- Molecule
- Neutralization
- Nuclear fission
- Relative Atomic Mass
- Radioactive decay
- Reduction
- Reduction half-cell
- Redox processes
- Radioactive Isotope
- Radioactivity
- Salt bridge
- Substitution reaction
- Solvent
- Solute
- Solution
- Saturated solution
- Salt
- Solubility
- Soft water
- Structural formula
- Suspension
- Sublimation
- Substance:Chemical substance
- Strong acid
Endothermic reaction
This is a reaction that absorbs heat from its surroundings. Temperature of the reacting mixture falls in the process.
Endothermic reactions have positive enthalpies (+ΔH).
Example: Enthalpy of formation of hydrogen bromide (HBr)
½ H2(g) + ½Br2(g) ⟶ HBr(g) ΔH = +262.5 kJ/mol
OTHER TOPICS (FULL)
INTRODUCTION TO CHEMISTRY
SIMPLE CLASSIFICATION OF SUBSTANCES AND SEPARATION OF MIXTURES
ACIDS, BASES AND INDICATORS
AIR AND COMBUSTION
WATER AND HYDROGEN
STRUCTURE OF THE ATOM, AND THE PERIODIC TABLE
CHEMICAL FAMILIES AND PATTERNS IN PROPERTIES
CHEMICAL BONDING AND STRUCTURE
SALTS
EFFECT OF AN ELECTRIC CURRENT ON SUBSTANCES
CARBON AND SOME OF ITS COMPOUNDS