Questions: Which is a pure substance? coffee silver chocolate air

Which is a pure substance? coffee silver chocolate air
Transcript text: Which is a pure substance? coffee silver chocolate air
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Solution

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Solution Steps

Step 1: Define Pure Substance

A pure substance is a material that has a constant composition and has consistent properties throughout the sample. It consists of only one type of particle, which can be an element or a compound.

Step 2: Analyze Each Option
  • Coffee: Coffee is a mixture of various compounds, including water, caffeine, and other organic substances. It is not a pure substance.
  • Silver: Silver is an element, represented by the symbol \( \text{Ag} \) on the periodic table. It consists of only one type of atom, making it a pure substance.
  • Chocolate: Chocolate is a mixture of ingredients such as cocoa solids, cocoa butter, sugar, and milk. It is not a pure substance.
  • Air: Air is a mixture of gases, primarily nitrogen and oxygen, along with small amounts of other gases. It is not a pure substance.
Step 3: Identify the Pure Substance

Based on the analysis, silver is the only option that qualifies as a pure substance because it is an element with a uniform composition.

Final Answer

\(\boxed{\text{silver}}\)

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