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Questions and Answers
What is the main difference between solid, liquid, and gas?
What is the structure of an atom's nucleus?
Which subatomic particle has a positive charge?
What is the mass of a neutron?
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What does the atomic number of an element represent?
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Study Notes
Composition Matter
- Matter can be broken down into two types: pure substance and mixture.
Pure Substance
- Made up of one type of atom/molecule.
- Elements: substances that can't be decomposed into a simpler substance.
- There are 118 elements found on earth.
- Examples of elements: helium, copper.
Compounds
- Substances composed of 2 or more elements in fixed proportions.
- Examples of compounds: water (H2O - hydrogen/oxygen), salt (NaCl - sodium/chlorine), sugar (C12H22O11 - carbon/hydrogen/oxygen).
- Water (H2O) has a fixed proportion of two hydrogens per one oxygen.
Mixture
- Made up of many types of atoms/molecules.
- Can be classified into two types: homogeneous mixture and heterogeneous mixture.
Homogeneous Mixture
- Two or more elements or compounds that are uniformly mixed together.
- Examples: milk, cola, air.
- Components are not visible to the naked eye, but can be seen with a microscope.
Heterogeneous Mixture
- Two or more compounds/elements that are not uniformly mixed.
- Components are visible to the naked eye.
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Description
Test your knowledge of elements, compounds, and mixtures with this quiz. Learn about the characteristics of pure substances, elements, compounds, and mixtures, as well as their properties and examples.
