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A substance is defined by its own unique set of physical and chemical properties.
- Physical Properties
- Characteristics that can be observed without changing the identity of the substance itself. Examples:
area elasticity odour absorbency hardness solubility brittleness luster shape boiling/condensation point length texture conductivity magnetic attraction transparency color malleability temperature density mass volume ductility melting/freezing point viscosity
- Physical Change
- These occur when the substance changes its physical form or appearance, but not its composition. Examples include shape changes, phase changes and dissolving.
- Chemical Properties
- Characteristics a substance shows when it interacts with, or transforms into other substances. This is a substance's ability to change into another substance. Examples:
- flammability
- reaction with water
- reaction with acids
- corrosiveness
- tendency to form compounds
- Chemical Change
- When a substance (or substances) is converted into a different substance (or substances). This is also called a chemical reaction. This is the process by which a substance changes. After a chemical change the physical and chemical properties of the substance change.
During all chemical reactions energy can either be released (exothermic) or energy is absorbed (endothermic).Now looking at the experiments done the other day you should be able to classify them as either chemical or physical and which ones released energy?
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