science

• State the chemical formula for chlorine


  Cl₂
• State the chemical formula for bromine

  Br₂
• State the chemical formula for iodine

  I₂
• State the chemical formula for hydrogen

  H₂
• State the chemical formula for carbon dioxide

  CO₂
• State the chemical formula for water

  H₂O
• State the chemical formula for sulfuric acid


  H₂SO₄
• State the chemical formula for hydrochloric acid


  HCl
• State the chemical formula for nitric acid

  HNO₃
• State the chemical formula for calcium carbonate

  CaCO₃
• State the chemical formula for copper sulfate


  CuSO₄
• State the chemical formula for nitrogen


  N₂
• State the chemical formula for sodium hydroxide

  NaOH
• State the chemical formula for aluminium chloride

  AlCl₃
• State the chemical formula for ammonia

  NH₃
• State the chemical formula for oxygen

  O₂
• What does the state symbol (aq) represent?

  Aqueous/solution
• State the 3 subatomic particles

  Proton, neutron, electron
• Protons have a _______ charge

  positive
• Neutrons have _______ charge

  neutral/no
• Electrons have a _______ charge

  negative
• State the mass of a proton

  1
• State the mass of an electron

  almost 0
• State the mass of a neutron

  1
• To calculate the mass of an atom you add the number of ________ + _________

  protons + neutrons
• The atomic number tells you the number of _______ in an atom

  protons
• Atoms have no overall charge because they have the same number of ________ and ________

  protons and electrons
• Isotopes are atoms of the same element with the same number of ______ but different number of _______

  protons, neutrons
• To calculate the number of neutrons you do ________ number - ________ number

  mass - atomic
• Substances containing only one type of atom are called ________

  elements
• Two or more types of element bonded together are called ________

  compounds
• Two or more atoms bonded together are called _______

  molecules
• The group number is the number of electrons in the _________

  outer shell
• The period number is the number of _________

  electron shells
• Mendeleev left gaps for __________

  undiscovered elements
• Mendeleev arranged his periodic table in increasing_______

  atomic mass
• When an atom _____ electrons it forms a positive ion

  loses
• When an atom loses electrons it forms a ______ ion

  positive
• When an atom _____ electrons it forms a negative ion

  gains
• When an atom gains electrons it forms a _____ ion

  negative