Chemistry 11 - Conservation Laws

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16 Terms

1
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A quantity is conserved if the quanity…

does not change during a reaction. That is if the system is closed with respect to that quanity.

2
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A conservation law…

states what is conserved (unchanged) in a special set of circumstances. (think closed systems)

3
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What’s the law of conservation of mass?

States that the total mass in a closed system doesn’t change during a chemical reaction.

4
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What’s the law of conservation of atoms?

States that the total number and type of atoms in a closed system doesn’t change during a chemical reaction.

5
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What’s the law of conservation of electrical charge.

States that the total electrical charge in a closed system doesn’t change during a chemical reaction.

6
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What’s the law of conservation of energy?

States that the total energy in a closed system doesn’t change during a chemical reaction.

7
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Paper ripping: What’s conserved?

  1. Composition (material)

  2. Total mass

  3. Properties (colour, density, etc.)

8
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Paper ripping: What’s not conserved?

  1. Number of pieces

  2. Shape

9
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What conversion law is broken here:

Fe + S → CuS

The Law of Conservation of Mass and the Law of Conservation of Atoms.

10
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What conversion law is broken here:

7.0g N2(g) + 8.0g O2(g) → 16.0g NO

The Law of Conservation of Mass

11
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What conversion law is broken here:

3Cr + O2 → Cr2O3

The Law of Conservation of Atoms and the Law of Conservation of Mass.

12
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Does mass of reactants always equal mass of products?

Yes. The Law of Conservation of Mass states that. Must be closed system though.

13
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In a chemical reaction, what’s conserved?

The number and type of atoms.

14
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What law is this?

States that the total energy in a closed system doesn’t change during a chemical reaction.

Law of Conservation of Energy

15
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What law is this?

States that the total number and type of atoms in a closed system doesn’t change during a chemical reaction.

Law of Conservation of Atoms

16
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What law is this?

States that the total mass in a closed system doesn’t change during a chemical reaction.

Law of Conservation of Mass