How does the mass change within a chemical reaction?

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Presentation transcript:

How does the mass change within a chemical reaction?

Learning Objectives Aiming for 4: Understand that in a reaction the number of atoms of each element remains unchanged. Aiming for 6: Explain any observed changes in mass in a non-enclosed system during a chemical reaction. Aiming for 8: Explain any observed changes in mass relating to the particle model.

Open and Closed Systems Open systems – can freely exchange energy and matter with their surroundings e.g. a saucepan cooking on the stove. Closed systems – can only exchange energy with their surrounding and not matter e.g. putting a lid on a saucepan cooking on the stove. Isolated systems – do not allow the exchange of energy or matter within the system to its surrounds e.g. a thermos flask.