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Questions and Answers
What is a pure substance?
What is a pure substance?
- A material that contains multiple types of atoms
- A mixture of elements and compounds
- A type of matter with a fixed composition (correct)
- A substance that can be separated into its components
Which of the following is an example of a pure substance?
Which of the following is an example of a pure substance?
- Copper, Cu (correct)
- Concrete
- Air
- Saltwater
What is an element?
What is an element?
- A pure substance with a fixed composition (correct)
- A material that can be separated into simpler substances
- A compound composed of two or more elements
- A substance made up of different types of atoms
What is a compound?
What is a compound?
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What is the composition of a pure substance?
What is the composition of a pure substance?
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Study Notes
Pure Substances
- A pure substance consists of only one type of particle, leading to uniform properties throughout.
- Notably, pure substances can exist in different states of matter (solid, liquid, gas) but maintain chemical consistency.
Examples of Pure Substances
- Elements and compounds serve as examples of pure substances.
- Pure water (Hâ‚‚O) is a common example of a compound.
- Gold (Au) is a characteristic example of an element.
Elements
- An element is a fundamental substance that cannot be broken down into simpler substances by chemical means.
- Each element consists of atoms that all have the same number of protons, distinguishing them from one another on the periodic table.
Compounds
- A compound is a pure substance formed from two or more different elements that are chemically bonded together.
- Compounds have unique properties that are distinct from the individual elements that comprise them, such as sodium chloride (NaCl).
Composition of a Pure Substance
- The composition of a pure substance includes a specific ratio of elements or a consistent arrangement of a single type of molecule.
- For pure compounds, the composition is always fixed, following a definite chemical formula.
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