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Chemical Change
A process that results in the formation of a new substance through the breaking and forming of bonds.
Physical Change
A change that alters the form of a substance but does not change its chemical identity.
Cellular Respiration
A series of chemical reactions in which food and oxygen are converted into carbon dioxide and water, resulting in mass loss.
Macroscopic Level
The large-scale observation of changes that can be seen without the aid of a microscope.
Evidence of Chemical Change
Indicators such as changes in odor, color, gas production, heat change, or formation of a precipitate.
Evidence of Physical Change
Primarily a change in the state of matter (solid, liquid, gas) without altering the substance's chemical identity.
Rotting Fruit
An example of a chemical change characterized by gas production and color change, difficult to reverse.
Rusting Iron
A chemical change involving a color change and heat production, also hard to reverse.
Crushing Aspirin
A physical change as there is no change in chemical identity or production of gas.
Burning Paper
A chemical change due to the combination with oxygen and irreversible nature.
Boiling Water
A physical change as it involves a change in state without altering the chemical identity.
Dissolving Sugar
A physical change where sugar molecules are separated but remain chemically unchanged.
Melting Butter
A physical change where the substance changes from solid to liquid but remains butter.
Acid-Base Changes
A type of chemical change observable through color changes in indicators like cabbage juice.
Formation of Precipitate
An indication of a chemical change where a solid forms from a solution.
Redox Reaction
A chemical change involving the transfer of electrons, often observable in titrations.
Titration
A laboratory method used to determine the concentration of a substance, often involving color changes.
