Conservation of Mass SNC2D.

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Presentation transcript:

Conservation of Mass SNC2D

It’s the Law A scientific law is a general statement that summarizes an observed pattern in nature.

It’s the Law A scientific law is a general statement that summarizes an observed pattern in nature. E.g. the Law of Gravity

Conservation of Mass Law of Conservation of Mass: In a chemical reaction, the total mass of the _______ is always ______ the total mass of the ________.

Conservation of Mass Law of Conservation of Mass: In a chemical reaction, the total mass of the reactants is always _______ the total mass of the _________.

Conservation of Mass Law of Conservation of Mass: In a chemical reaction, the total mass of the reactants is always _______ the total mass of the products.

Conservation of Mass Law of Conservation of Mass: In a chemical reaction, the total mass of the reactants is always equal to the total mass of the products.

Conservation of Mass i.e. compounds can be made or broken apart in a chemical reaction, but atoms are not created or destroyed, only rearranged.

Example When magnesium is burned,

Example When magnesium is burned, magnesium + oxygen gas magnesium oxide

Example When magnesium is burned, magnesium + oxygen gas magnesium oxide The mass of the magnesium and oxygen gas (gas has mass!) is equal to the mass of the magnesium oxide ash.

A Leading Question But if we write out the formulas for the burning of magnesium:

A Leading Question But if we write out the formulas for the burning of magnesium: Mg + O2 MgO

A Leading Question But if we write out the formulas for the burning of magnesium: Mg + O2 MgO If atoms can’t be created or destroyed. . . . what happened to the second oxygen in O2???