Science - 5th Grade
Students will understand that chemical and physical changes occur in matter.
Describe that matter is neither created nor destroyed even though it may undergo change.
5 Experiments of Physical and Chemical Changes
The Law of Conservation of Mass states that mass is conserved in
physical and chemical changes. Students explore this concept by taking initial
masses, making predictions, and finding final masses of physical and chemical
changes. Students observe water changing from ice to a liquid, a piece of
cardboard being cut up, salt dissolving in water, Alka-Seltzer reacting in water,
and water's physical property of cohesiveness being disrupted by soap.
Students will mix ingredients to create a chemical change and "Blobber" - a substance similar to silly putty.
Changes in Matter, Not in Weight
Students will explore the law of conservation of mass by tearing paper, observing a reaction between baking soda and vinegar, and predicting whether melting, freezing, and dissolving will cause a change in mass.
Sum of the Parts
The students will use math expressions and equations to discover that
the sum of an object's parts is equal to the whole and that in a chemical reaction or physical
change matter is neither created nor destroyed.
TRB 5:1 - Activity 1: Dissolving Salt
This lesson will demonstrate to students that matter, such as salt, may seem to have disappeared when it is dissolved in water, but it is still there.
TRB 5:1 - Activity 2: Sum of the Parts
This activity will help students discover that the total weight of an object is equal to the weight of its individual parts after being
TRB 5:1 - Activity 3: Melting and Freezing
After completing this activity students will discover that the weight of ice / water will not change after it undergoes melting or freezing.
TRB 5:1 -- Act. 4: Chem. Reactions - Borax & Glue, Cream
Students will conclude at the end of this activity that the combined weight of the reactants in a chemical reaction is always equal to the combined weight of the products.
What a Reaction
These two activities will explain the "Law of Conservation of Matter" - matter can neither be created nor destroyed.
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