Flammability: This describes a substance's ability to burn or ignite.
* Example: Wood is flammable, while water is not.
Reactivity: This refers to how readily a substance undergoes chemical reactions with other substances.
* Example: Sodium is highly reactive with water, causing a violent reaction. Gold is very unreactive and resists corrosion.
Acidity/Basicity: These properties measure a substance's ability to donate or accept protons (H+ ions).
* Example: Vinegar is acidic (contains acetic acid), while baking soda is basic (contains sodium bicarbonate).
Oxidation State: This indicates the degree of oxidation (loss of electrons) of an atom in a compound.
* Example: Iron in its elemental state has an oxidation state of 0, while iron in iron oxide (rust) has an oxidation state of +3.
Heat of Combustion: This is the amount of heat released when a substance is burned completely.
* Example: Methane has a higher heat of combustion than propane, meaning it releases more energy when burned.
pH: This measures the acidity or alkalinity of a solution on a scale of 0 to 14.
* Example: A pH of 7 is neutral, while a pH of 1 is very acidic and a pH of 13 is very basic.
Decomposition: This refers to the breakdown of a substance into simpler components.
* Example: Hydrogen peroxide decomposes into water and oxygen.
Stability: This describes the tendency of a substance to resist chemical change.
* Example: Noble gases are very stable and rarely participate in chemical reactions.
Key Points:
* Chemical Properties Can Only be Observed During Chemical Reactions: They involve the formation of new substances with different compositions and properties.
* Chemical Properties Cannot be Observed by Simple Physical Means: You can't tell if a substance is flammable by looking at it, you have to try to ignite it.
Let me know if you'd like more examples or explanations!
