Bellringer
Identify the changes as PHYSICAL (P) OR CHEMCIAL (C)
in the BEFORE column
Learning Target…
• I can distinguish between a physical and chemical change. This means I know what physical changes and chemical changes are and I can tell the difference between them.
Characteristics of Physical Changes
• A change in physical properties• Change the form or appearance of the
substance• A new substance is NOT formed• You can often reverse it
Examples of Physical Changes
• Cutting• Change in shape• Dissolving– Consider dissolving sugar in lemonade, though
you can no longer see the sugar, you know it hasn’t changed because you can still taste it!
Examples of Physical Change
• Any change in state– Melting: solid to liquid– Boiling: liquid to gas– Condensation: gas to liquid– Freezing: liquid to solid– Sublimation: solid to gas– Deposition: gas to solid
Changes of State
• Matter is made up of moving particles• The state of matter is determined by how
much energy the particles have• Draw a picture of what the particles look like
in a solid, liquid, and gas.
Changes of State
• Solids– Particles are close together and only
vibrate• Liquids– Particles move faster and slide past
each other• Gas– Particles move quickly and far apart
Changes of State
• Particles of matter move faster or slow down as temperature changes and so the state changes!
Illustrating Physical Changes
• Let’s illustrate some physical changes!• Consider what the particles are doing during the
change!• First, let’s do one together!– Cutting paper– Melting ice– Evaporating water– Mixing salt and water– Molding playdough
