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Questions and Answers
What is an element?
What is an element?
- A pure substance containing only one kind of atom (correct)
- A mixture of different substances
- A compound with multiple atoms
- None of the above
What defines a compound?
What defines a compound?
- Contains two or more kinds of atoms combined chemically (correct)
- A mixture that can be separated by physical means
- Made up of only one kind of atom
- Only contains gases
Which of the following is a mixture?
Which of the following is a mixture?
- Air (correct)
- Sugar (C6H12O6)
- Water (H2O)
- Diamond (C)
What is the definition of a mixture?
What is the definition of a mixture?
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What is the formula for water?
What is the formula for water?
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______ is a compound with the formula NH3.
______ is a compound with the formula NH3.
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Match the following substances to their type:
Match the following substances to their type:
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A compound can be separated by physical means.
A compound can be separated by physical means.
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Krypton (K) is an element.
Krypton (K) is an element.
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Which of the following is a compound?
Which of the following is a compound?
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Which of the following are classified as mixtures?
Which of the following are classified as mixtures?
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Study Notes
Elements
- Pure substances containing only one kind of atom.
- Always homogeneous and cannot be separated into simpler materials except during nuclear reactions.
- Over 109 elements are classified on the periodic table.
- Examples include Diamond (C), Krypton (K), Bismuth (Bi), Uranium (U), Iron (Fe), Gold (Au), and Titanium (Ti).
Compounds
- Pure substances made of two or more kinds of atoms that are chemically combined.
- Always homogeneous and cannot be separated by physical means; requires a chemical reaction for separation.
- Properties of compounds differ from the properties of the individual elements they contain.
- Examples include Water (H2O), Ammonia (NH3), Dry Ice (CO2), Sugar (C6H12O6), Sulfuric Acid (H2SO4), Baking Soda (NaHCO3), and Alcohol (CH3OH).
Mixtures
- Composed of two or more elements or compounds that are not chemically combined, with no reaction occurring between substances.
- Can be homogeneous (solutions) or heterogeneous (non-uniform).
- Mixtures can be separated into components through physical or chemical means.
- Properties of mixtures reflect the properties of their components.
- Examples include Air, Wood, Bronze, Milk, Gasoline, Pails of Garbage, Ink, Popcorn, Dogs, Pizza, and Concrete.
Non-Classified
- Energy and Electricity do not fall into the categories of elements, compounds, or mixtures.
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