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Questions and Answers
What is matter classified as?
What is matter classified as?
- Pure substances (correct)
- Elements
- Mixtures (correct)
- Atoms
How are mixtures classified?
How are mixtures classified?
- Heterogeneous
- Homogeneous
- Both A and B (correct)
- None of the above
Mixtures contain two or more _____________ which can be separated through ______________.
Mixtures contain two or more _____________ which can be separated through ______________.
pure substances, physical change
Heterogeneous mixtures have _______________ and homogeneous mixtures called _____________ have one phase.
Heterogeneous mixtures have _______________ and homogeneous mixtures called _____________ have one phase.
What are pure substances classified as?
What are pure substances classified as?
Elements are represented by ___________ and made of ___________.
Elements are represented by ___________ and made of ___________.
What are the chemical symbols for carbon and oxygen?
What are the chemical symbols for carbon and oxygen?
O occurs as?
O occurs as?
Elements _______________, which cannot be broken down.
Elements _______________, which cannot be broken down.
What are compounds represented by and made of?
What are compounds represented by and made of?
What are the chemical formulas for salt and water?
What are the chemical formulas for salt and water?
Molecules can be broken down into ______________ through ______________.
Molecules can be broken down into ______________ through ______________.
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Study Notes
Classification of Matter
- Matter is divided into two main categories: mixtures and pure substances.
Mixtures
- Mixtures are further classified into heterogeneous and homogeneous types.
- Mixtures consist of two or more pure substances that can be separated by physical means.
Heterogeneous vs. Homogeneous Mixtures
- Heterogeneous mixtures have two or more distinct phases, allowing for visible separation.
- Homogeneous mixtures, also known as solutions, consist of a single phase where components are uniformly distributed.
Pure Substances
- Pure substances fall into two categories: elements and compounds.
Elements
- Elements are represented by chemical symbols and are made up of atoms.
- The chemical symbol for carbon is C, and for oxygen, it is O.
- Oxygen occurs as O2, indicating that it consists of two atoms.
- Elements are defined by their atomic structure and cannot be broken down further.
Compounds
- Compounds are represented by chemical formulas and are composed of molecules.
- Common examples of chemical formulas include sodium chloride (NaCl) for salt and water (H2O).
- Molecules in compounds can be broken down into atoms through chemical changes.
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