Stoichiometry

• What is an element

  A substance that contains only one kind of atom
• What is a compound 


  A substance that contains atoms of different elements
• What is the formula for ethanol

  C2H5OH
• What is a mixture

  Different substances that are not chemically bonded together
• How is a mixture of Iron powder and sulfer separated

  By dissolving sulfer in methyl benzene the filtering the iron
• What kind of change happens during burning?

  Chemical change
• What is the a compound of iron and sulfer called

  Iron (II) sulfide
• Why does a chemical change occur during burning?

  Atoms of different elements become chemically bonded together
• What are the signs of a chemical change

  1. One or more new substances are formed
  2. Energy is given out doing the reaction
  3. The change is usually difficult to reverse
• When does a physical change occur?

  When no new substance is formed
• Give the formula for water

  H2O
• Give the formula for Carbon dioxide

  CO2
• What is the formula for hydrogen chloride

  HCL
• What is the formula for Ammonia

  NH3
• What is teh observation when magnesium burns with oxygen and what does it form

  Dazzling white light and it forms white ash called magnesium oxide
• What does the + and ----> mean

  + Means reacts with and ----> means to form
• What is the word equation for the reaction of magnesium and oxygen

  Magnesium + Oxygen ----> Magnesium Oxide