chemistry 🧪🧪

• What is the charge of atoms in their neutral state?

  Atoms are neutral.
• What happens when elements react?

  Elements react to form compounds.
• What is the relationship between protons and electrons in a neutral atom?

  The number of protons and electrons are equal.
• What occurs when the number of electrons and protons are not equal?

  The atom has an overall charge.
• What do metal atoms do to form positive ions?

  Metal atoms lose electrons.
• What do non-metal atoms do to form negative ions?

  Non-metal atoms gain electrons.
• What is the atomic number of an element?

  Atomic number = number of protons.
• What is the mass number of an element?

  Mass number is the total number of protons and neutrons.
• What is the significance of chemical bonds in compounds?

  Elements are held together by chemical bonds in compounds.
• How do the properties of compounds differ from those of the individual elements that form them?

  Compounds have different properties than the individual elements that form them.
• What are the key characteristics of atoms and compounds?

  • Atoms are neutral with equal protons and electrons.
  • Elements react to form compounds.
  • Metal atoms lose electrons to form positive ions.
  • Non-metal atoms gain electrons to form negative ions.
  • Compounds are held together by chemical bonds.
• What is the formula for calculating neutrons in an atom?

  • Neutrons = atomic mass - atomic number
• What is the atomic number and mass number?

  • Atomic number = number of protons
  • Mass number = total number of protons and neutrons
• the formula for the reaction between hydrochloric acid and magnesium is Mg + 2HCl → MgCl2 + H2
• the equation for the reaction between sodium carbonate and sulfuric acid is Na2CO3 + H2SO4 → Na2SO4 + CO2 + H2O
• the equation for the reaction between copper oxide and dilute nitric acid is CuO + 2HNO3 → NO2 + H2O + Cu(NO3)2
• The symbol for sodium oxide is Na2O
• The symbol for calcium carbonate is CaCO3
• The symbol for chlorine gas is Cl2
• The symbol for aluminium chloride is AlCl3
• The symbol for potassium chloride is KCI
• what is the name given to the process whereby one element replaces another in a compound without changing its properties, this is called displacement
• The equation for the reaction between aluminum chloride and potassium iodide is AlCl3 + 6KI → KAl(IO3)2 + 3I2
• The symbol for magnesium hydroxide is Mg(OH)2
• The symbol for potassium bromide is KBr
• The symbol for calcium phosphate is Ca3PO4
• The symbol for iron (III) oxide is Fe2O3
• The symbol for aluminium oxide is Al2O3
• the equation for copper reacting with silver nitrate solution is Cu + 4AgNO3 = 4Ag + Cu(NO3)2
• The symbol for lead iodide is PbI2
• The equation for the reaction between copper oxide and water is CuO + H2O → Cu(OH)2
• The symbol for iron sulfide is FeS
• The symbol for potassium iodide is KI