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Pure substances consist of only one type of particle.
It changes from liquid to solid without altering its chemical composition.
Only physical properties change, and the original state can be restored.
Chemical changes result in new substances with different properties.
Melting of ice or boiling of water.
It often involves the formation of one or more new products.
The weight remains constant.
The burning of a substance in air, combining it with oxygen.
Changes that release heat during the reaction.
It supports combustion and helps substances burn more brightly.
The visible part of a fire, consisting of burning gases.
Non-luminous, luminous, and dark zones.
Complete combustion takes place, producing a blue flame.
It identifies metals based on the color produced in a flame.
It changes from solid to liquid without altering its chemical composition.
A change that absorbs heat during the reaction.