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Properties of Matter

11-13 yrs old

14-18 yrs old

Science

Technology

Identify when a chemical reaction has occurred and what elements, molecules or compounds were involved.

avatar Submitted By: Minecraft Education

January 22, 2018

Learning Objectives

  • Differentiate between elements, molecules, compounds, & mixtures.
  • Create mixtures that can then react.
  • Identify when a chemical reaction has occurred and what elements, molecules or compounds were involved.
  • Create compounds which have properties that are different from their constituent parts.

Guiding Ideas

Lesson 3

Elements consist of 1 type of atom and cannot be broken down into smaller components by chemical means.

Molecules consist of at least 2 atoms joined together with a chemical bond, for example two atoms of oxygen react with one another to from molecular oxygen (O2), and two hydrogen atoms react with an oxygen to form a molecule of water (H2O).

Compounds are molecules consisting of atoms of at least two different types of elements joined with chemical bonds. For example, water is a compound and it is also a molecule. A chemical reaction is needed to separate the elements in a compound or molecule.

Mixtures can be formed by intermingling compounds, molecules or elements. For example air is a mixture of gases (nitrogen, oxygen, carbon dioxide and water)

The parts of a mixture can be separated with a physical process.

Something might cause a mixture to react to form new compounds and molecules.

 

Student Activities

Students should use the compound creator to see what molecules they can make. They can be given chemical formula, without an explanation of what the formula will produce. Students can then use their new compounds to create new mixtures, particularly fertilizer, glow sticks and 'elephant's toothpaste'.

Students can discuss whether chemical reactions occur when the new items are used, and which parts react. For example elephants toothpaste is a mixture of hydrogen peroxide, potassium iodide and soap. The H2O2 decomposes to form H2O and O2. The potassium iodide is unchanged, but it catalyses (speeds up) the decomposition of the H2O2. The soap does no react either, but just captures the oxygen gas to make a foam.

Students should also be encouraged to think about the outcomes of the lesson 'chemistry all around us' and how the reactions, object and materials they discussed there might be categorized as elements, compounds or mixtures.

Performance Expectations

• Recognize and give examples of elements, compounds, molecules and mixtures

• Use Minecraft to provide examples of chemical reactions.

• Be able to recgonise the difference between a chemical and physical reaction.