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A pure substance is a sample of matter with both definite and constant composition with distinct chemical properties. Examples: water, diamond, gold, table salt (sodium chloride), ethanol

Salt water is not a pure substance because it is a mixture of two compounds, NaCl and H2O.

Orange Juice again is a mixture of sugar, water and orange pulp. So it is not a pure substance.

Duct Tape is made of three layers:

Layer 1: A Resilient Plastic

Layer 2: A Fabric Mesh

Layer 3: Rubber Based Adhesive

So it is certainly not a pure substance.

Baking soda, on the other hand, is a pure substance because it is a compound (NaHCO3) and all compounds and elements are considered pure substances.

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13y ago

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