chemical changes, physical changes, properties, states of matter, matter, phases, physical property, chemical property
4, 5, 6
1 Hour Total
Students will learn about the difference between and physical changes by performing simple experiments.
To learn about chemical and physical changes.
Sand (2 colors)
Preparation and Set Up:
Gather the necessary materials.
A chemical change is defined as an irreversible process. It is a change in which one or more new substances are formed. A physical change is reversible, no new products are formed. A change in phase is considered to be a physical change.
States of matter
Introduce the concepts of physical and chemical changes. Write important definitions on the board and refer to them throughout class.
There are a couple of experiments to perform for the class:
Show the formation of a gas when you mix vinegar and baking soda.
After mixing the two ingredients in a graduated cylinder. Place a balloon over the top to capture the gas.
Conduct a class discussion about what happened in this experiment and what type of change occurred.
Show the melting of ice and boiling of water.
Discuss what is happening, but do not discuss the type of change until further experiments have been done.
Light a match.
Light a candle.
Show the inside of a hard boiled egg and an uncooked egg.
Mix salt in a glass of water.
Have students pair up into groups of two and give students two cups of colored sand to mix together.
Have student pairs mix vinegar and milk together as well.
Have students fill out worksheets (attached).
While students are working boil the salt water until there is only salt left.
Lead a discussion about the activity and discuss the answers.