Science - Atoms 2024

• What are atoms?


  the elements that make up everything
• What is an element?


  a pure substance that is made up of only 1 atom
• What is a compound?

  something with 2 or more elements that are chemically combined
• What is a molecule?


  a group of two or more atoms that are held together by chemical bonds
• What can be found in the nucleus?

  Protons and Neutrons
• What elements make up most atoms?

  Hydrogen and Helium
• What charge do protons have?

  Positive charge
• What charge do electrons have?

  negative charge
• What charge do neutrons have?

  no charge
• How do you identify the atomic number?

  it is the lower number of the two given in an element
• What is an atomic number?

  how many electrons are in an element
• What is an ion?


  a charged version of an atom that has either gained or lost electrons.
• What is an atom?

  the sum of the protons and neutrons in an element
• What is a mass number?

  the number of neutrons in an element
• What is an Isotope?

  atoms that have the same amount of protons, but a different amount of neutrons
• What is a Protium?

  1 proton and 0 neutrons
• What is a Deuterium?

  1 proton and 1 neutron
• What is a Tritium?

  1 proton and 2 neutrons
• What is a stable Isotope?

  a stable nucleus, and the number of protons and neutrons are balanced
• What is an unstable isotopes?

  when there are more neutrons than protons
• What is a Chemical Reaction?

  when substances react to form new substances
• What can happen during a Chemical Change?

  • produce sound, gas production, temperature change etc.
• What is a Physical Change?

  when the size or matter of a substance changes
• What is a Spontaneous Reactant?

  a reaction that proceeds on its own, without the need for additional energy
• What is a Non-Spontaneous Reactant?

  a reactant that requires the energy of external factors
• What is an Exothermic Reaction?

  a chemical reaction that releases heat
• What is an Endothermic Reaction?

  a chemical reaction that absorbs heat energy from surroundings
• Why do Plants Photosynthesise?

  because they have chloroplasts that have chlorophyll that are responsible
• What does every Combustion Reaction Involve?

  Oxygen
• Anytime anything burns it is a?

  combustion reaction
• Are Combustion Reactions Exothermic or Endothermic?

  Exothermic