Temperature

Temperature

Everything litty, I love when it's hot!

Standard

SC.7.P.11.1 Recognize that adding heat to or removing heat from a system may result in a temperature change and possibly a change of state

What is Temperature?

• Temperature expresses hot and cold

• It is the manifestation of thermal energy, present in all matter

• Measured with a thermometer

Multiple Choice

How is temperature expressed?

• By watching the weather

• By touching something

• By how hot an object is

• By how hot and cold an object is

Average Molecular Kinetic Energy

• In hotter objects, the molecules are moving very quickly and have a lot of energy.

• In cooler objects, the molecules are moving very slowly and have a lot of energy.

Average Molecular Kinetic Energy

• When two objects with different temperatures meet, the molecules collide until they are all moving at the same speed (same temperature).

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Open Ended

Thought Question:

In a pot of boiling water, the water vapor rises from the surface of the water. What is the difference between the molecules in the water vapor and the molecules in the liquid water?

Thanks for Watching!

Next stop, review questions!

Multiple Choice

1. David drinks a glass of water in his kitchen. The water is at room temperature, and David decides to make it colder by adding ice. Which of the following describes why the ice cubes will melt?

• Liquid water is reacting with solid water to absorb

  energy.

• Water is evaporating from the surface of the water.

• Slow-moving molecules move out of the ice.

• Heat from the water moves into the ice.

Multiple Choice

Anna pours herself some room-temperature soda from a bottle and adds four ice cubes. In a few minutes the ice cubes are smaller and the soda is much colder. Which of the following best explains the change in temperature of the soda?

• Heat flowed from the soda to the ice cube and caused it to partially melt.

• Coldness flowed from the ice cube to the soda, making the soda colder.

• The cold water from the melting ice went into the soda, replacing the warmer water that was in the soda.

• The water from the melting ice makes the soda more dilute, and the lower concentration makes the temperature lower.