Lo 3 The student is able to select and apply mathematical relationships to mass data in order to justify a claim regarding the identify and/or estimated purity of a substance. (Sec 5, 7) lo 3

Liquid Nitrogen and a Balloon

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Liquid Nitrogen and a Balloon

• What happened to the gas in the balloon?
• A decrease in temperature was followed by a decrease in the pressure and volume of the gas in the balloon.

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Liquid Nitrogen and a Balloon

• This is an observation (a fact).
• It does NOT explain “why,” but it does tell us “what happened.”

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Gas laws can be deduced from observations like these.

• Gas laws can be deduced from observations like these.
• Mathematical relationships among the properties of a gas (Pressure, Volume, Temperature and Moles) can be discovered.

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