Investigating Types of Changes

1
Investigating Types of Changes

• Lab

2
Objectives

• Make observations about changes in matter
• Form hypotheses about observed changes based on
  observations
• Identify and contrast chemical and physical
  changes

3
Safety

• Wear your goggles and apron for the entire lab
• Handle all chemicals with care
• Dispose of chemicals as instructed in the
  procedure

4
Data TableDraw in your lab notebook prior to
starting the lab
Station Materials Observations Before Observations After Chemical or Physical change?
1 Baking soda (NaHCO3) and vinegar (C2H4O2)
2 Aluminum Foil (Al)
3 Silver Nitrate (AgNO3) and sodium chloride (NaCl)
4 Sand and Water
5 Sugar (C12H22O11) and Water
6 Hydrochloric acid (HCl) and Magnesium (Mg)
7 Potassium Iodide (KI) and lead (II) nitrate (Pb(NO3)2)
8 Ice melting and water boiling
5
Analysis QuestionsAnswer in complete sentences
in your notebook under your data table.

1. Which of the stations involved chemical
   reactions? From evidence gathered in the lab,
   what are some sources of evidence that a
   chemical reaction has occurred? Explain.
2. Which of the following stations involved physical
   changes? From evidence gathered in the lab, what
   are some sources of evidence that a physical
   change has occurred? Explain.
3. In your own words, explain the difference between
   a chemical and physical change.
4. Give two examples of elements, two examples of
   compounds, and two examples of mixtures used in
   the lab.