Podcast
Questions and Answers
What is the main difference between solid, liquid, and gas?
What is the main difference between solid, liquid, and gas?
- How close or far the atoms are from each other (correct)
- How fast the atoms move in each state
- How atoms are attached to each other
- The density of atoms in each state
What is the structure of an atom's nucleus?
What is the structure of an atom's nucleus?
- Dense and large, containing protons and electrons
- Dense and small, containing protons and neutrons (correct)
- Containing only protons and no neutrons
- Empty space with fast-moving electrons
Which subatomic particle has a positive charge?
Which subatomic particle has a positive charge?
- Electron
- Neutron
- Proton (correct)
- Positron
What is the mass of a neutron?
What is the mass of a neutron?
What does the atomic number of an element represent?
What does the atomic number of an element represent?
Flashcards
Solid vs. Liquid vs. Gas
Solid vs. Liquid vs. Gas
The distance between atoms defines its state.
Structure of an atom's nucleus?
Structure of an atom's nucleus?
The nucleus is small, dense, and contains protons and neutrons.
Subatomic particle + charge?
Subatomic particle + charge?
A proton carries a positive charge.
Mass of a neutron?
Mass of a neutron?
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What is the atomic number?
What is the atomic number?
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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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