Chapter 9 Study Guide

Know these vocabulary words:

• Mass
• Volume
• Density
• Protons
• Neutrons
• Electrons
• Nucleus
• Atomic Number
• Chemical Formula
• Physical Change
• Atom
• Endothermic
• Chemical Change
• Exothermic
• Ionic Bond
• Covalent Bond
• Molecule
• Ion

Also know:

• How to use the formula for density! There will be 3 problems that you must use the formula to find your answer. P. E7
  
• Why liquids float (more dense/less dense) P. E14
  
• The difference between acids and bases. P. E42-43
  
• The similarities of elements listed in vertical columns in the periodic table. P. E25
  
• What elements are arranged by in the periodic table. P. E21 & E25
  
• Why atoms stay together. P. E34
  
• Physical properties that can identify substances. P. E8
  
• Chemical Changes and examples of P. E32
  
• Why elements have certain chemical formulas P. E33
  
• Signs that a chemical change is taking place P. E32
  
• What a molecule is P. E41
  
• Why ions can be negative or positive P. E35
  
• How to draw atoms given how many protons and neutrons there are. REMEMBER the # of protons always equal the # of electrons! Hint Hint! P. E18-20
  
• Draw a bond of H2O showing how the electrons are shared. P. E34

*There are also packets and a Density Lab you can look over while you are studying!

That is your test! Be sure to study and you will do great! :)