Elements, Compounds, and Mixtures
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Questions and Answers

What is the unit of relative atomic mass?

  • moles
  • kilograms
  • grams
  • no units (correct)

    • What is the relative atomic mass of hydrogen?

  • 2
  • 12
  • 1 (correct)
  • 6

    • What is the charge of a neutron?

  • 1+
  • 2+
  • 0 (neutral) (correct)
  • 1-

    • What determines the position of an element on the Periodic Table?

    <p>Proton number</p> Signup and view all the answers

    What is the symbol for atomic number?

    <p>Z</p> Signup and view all the answers

    What is an element composed of?

    <p>Atoms that all contain the same number of protons</p> Signup and view all the answers

    What is the total number of elements found in the Periodic Table?

    <p>118</p> Signup and view all the answers

    What is a characteristic of a compound?

    <p>It is made up of two or more elements chemically combined</p> Signup and view all the answers

    What is the location of the protons and neutrons in an atom?

    <p>In the nucleus at the centre of the atom</p> Signup and view all the answers

    What is the function of electrons in an atom?

    <p>They move very fast around the nucleus in orbital paths</p> Signup and view all the answers

    What is the unit used to express the mass of an atom?

    <p>Relative atomic mass</p> Signup and view all the answers

    Study Notes

    Elements, Compounds, and Mixtures

    • An element is a substance made up of atoms with the same number of protons, and cannot be split into simpler substances.
    • There are 118 known elements listed in the Periodic Table.
    • A compound is a pure substance made up of two or more elements chemically combined, with an unlimited number of possible compounds.
    • Compounds cannot be separated into their elements by physical means.

    Mixtures

    • A mixture is a combination of two or more substances (elements and/or compounds) that are not chemically combined.
    • Mixtures can be separated by physical methods such as filtration or evaporation.
    • Examples of mixtures include sand and water, oil and water, and sulfur powder and iron filings.

    Atomic Structure

    • All substances are made up of tiny particles called atoms, which are the building blocks of matter.
    • Each atom consists of protons, neutrons, and electrons.
    • Protons and neutrons are found in the nucleus at the center of the atom, while electrons move rapidly around the nucleus in orbital paths called shells.

    Subatomic Particles

    • Protons have a relative mass of 1 and a charge of 1+.
    • Neutrons have a relative mass of 1 and a charge of 0 (neutral).
    • Electrons have a negligible mass (about 1/1840) and a charge of 1-.

    Relative Atomic Mass

    • The relative atomic mass is a unit used to measure the mass of atoms.
    • One relative atomic mass unit is equal to 1/12th the mass of a carbon-12 atom.
    • The relative atomic mass of an element is measured relative to the mass of a carbon-12 atom.

    Atomic Number (Proton Number)

    • The atomic number (or proton number) is the number of protons in the nucleus of an atom.
    • The symbol for atomic number is Z.
    • The atomic number determines the position of an element on the Periodic Table and is also the number of electrons present in a neutral atom.

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    Description

    This quiz covers the basics of chemistry, defining elements, compounds, and mixtures, and explaining their differences.

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