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Questions and Answers
Which of the following best describes matter?
Which of the following best describes matter?
- Something that occupies space and has mass (correct)
- Something that occupies time and has energy
- Something that occupies time and has mass
- Something that occupies space and has energy
Which of the following is NOT a classification of matter?
Which of the following is NOT a classification of matter?
- Homogeneous (correct)
- Element
- Compound
- Mixture
What is the main difference between a mixture and a pure substance?
What is the main difference between a mixture and a pure substance?
- Proportions of components may vary in a pure substance, while they are fixed in a mixture
- Proportions of components may vary in a mixture, while they are fixed in a pure substance (correct)
- Pure substances cannot be separated into simpler substances, while mixtures can
- Pure substances can be separated into simpler substances, while mixtures cannot
Which of the following is a compound?
Which of the following is a compound?
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What is a homogeneous mixture?
What is a homogeneous mixture?
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Which of the following is a characteristic of a pure substance?
Which of the following is a characteristic of a pure substance?
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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 is a heterogeneous mixture?
Which of the following is a heterogeneous mixture?
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Which of the following is a metalloid?
Which of the following is a metalloid?
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Which of the following best describes a homogeneous mixture?
Which of the following best describes a homogeneous mixture?
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Study Notes
Matter
- Matter is anything that has mass and occupies space.
Classification of Matter
- Matter can be classified into two main categories: pure substances and mixtures.
Pure Substances
- A pure substance has a fixed composition and properties, and can be either an element or a compound.
- Characteristics of pure substances:
- Have a fixed boiling and melting point.
- Have a fixed composition.
- Have distinct properties.
Mixtures
- A mixture is a physical blend of two or more substances, where each substance maintains its chemical properties.
- Mixtures can be classified into two types: homogeneous and heterogeneous.
Homogeneous Mixtures
- A homogeneous mixture is a mixture in which the composition is uniform throughout, and the particles are evenly distributed.
- Examples: saltwater, sugar water, and air.
Heterogeneous Mixtures
- A heterogeneous mixture is a mixture in which the composition is not uniform throughout, and the particles are not evenly distributed.
- Examples: blood, soil, and granite.
Compounds
- A compound is a pure substance formed by the chemical combination of two or more different elements.
- Examples: water (H2O), carbon dioxide (CO2), and methane (CH4).
Elements
- An element is a pure substance that consists of only one type of atom.
- Examples: hydrogen (H), carbon (C), and oxygen (O).
Metalloids
- Metalloids are elements that exhibit some properties of metals and some properties of nonmetals.
- Examples: silicon (Si), germanium (Ge), and arsenic (As).
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