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TEKS 5.5 Matter and Energy The student knows that matter has measurable physical properties and those properties determine how matter is classified, changed, and used. The student is expected to: (B) identify the boiling and freezing/melting points of water on the Celsius scale.
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TEKS 5.5 Matter and Energy The student knows that matter has measurable physical properties and those properties determine how matter is classified, changed, and used.The student is expected to:(B) identify the boilingand freezing/melting points of water on the Celsius scale.
SOLIDS… do not easily change shape or volume.
LIQUIDS… caneasily change shape but do not easily change volume.
GASES… caneasily change shape and volume.
A change in matter that does not form a different type of molecule is called a physical change. The only thing that changes about the matter is the way it looks! Water molecules going through physical changes…
Freezing point is the temperature at which a liquid becomes a solid. Water has a freezing point of 0° C. This means that at 0° C, water changes from a liquid to a solid because heat energy has been removed.
Melting point is the temperature at which a solid becomes a liquid. Water has a melting point of 0° C. This means that at 0° C, water changes from a solid to a liquid because heat energy has been added.
Boiling point is the temperature at which a liquid becomes a gas. Water has a boiling point of 100° C. This means that at 100° C, water changes from a liquid to a gas because heat energy has been added.
EVAPORATION When heat energy is added, water molecules speed up and water vapor is formed. Liquid changes to a gas.
CONDENSATION When heat energy is removed from water vapor, the gas molecules slow down and water is formed. Gas changes to a liquid.
Describe the differences in the particles of each state of matter.
Which of the following is the temperature at which ice melts? • 0 Kelvin • 0o Fahrenheit • 0o Celsius • 0 Gram
Which of the following is the temperature at which ice melts? A. 0 Kelvin Incorrect Kelvin is the measurement unit that includes absolute zero. The temperature would have to be 274 K for ice to melt.
Which of the following is the temperature at which ice melts? B. 0o Fahrenheit Incorrect Fahrenheit is the measurement unit that is traditional in the U. S. The temperature would have to be 32o F for ice to melt.
Which of the following is the temperature at which ice melts? D. 0 Gram Incorrect A Gram (g) is the measurement unit used to represent mass – not temperature.
Which of the following is the temperature at which ice melts? C. 0o Celsius Correct The Celsius scale uses 0o as the melting point.
If you are camping at sea level and want to boil water so it will be safe to drink, what temperature will it need to reach? • 15 K • 100o C • 100o F • 150 g
If you are camping at sea level and want to boil water so it will be safe to drink, what temperature will it need to reach? A. 15 K Incorrect Kelvin is the measurement unit that includes absolute zero. The temperature would have to be 373o K for water to boil.
If you are camping at sea level and want to boil water so it will be safe to drink, what temperature will it need to reach? C. 100o F Incorrect Fahrenheit is the measurement unit that is traditional in the U. S. The temperature would have to be 212oF for water to boil.
If you are camping at sea level and want to boil water so it will be safe to drink, what temperature will it need to reach? D. 150 g Incorrect A gram is the measurement unit for mass – not temperature.
If you are camping at sea level and want to boil water so it will be safe to drink, what temperature will it need to reach? B. 100o C Correct The Celsius scale uses 100o as the boiling point for water.
Four students were working together in a lab group. They had to predict the temperature at which pure water would boil. They recorded their predictions in the table below.
Which student’s prediction was the closest to the boiling point of water? • Student 1 • Student 2 • Student 3 • Student 4
Which student’s prediction was the closest to the boiling point of water? C. Student 3 Correct 100o C is the boiling point of water.
Which student’s prediction was the closest to the boiling point of water? • Student 1 • Student 2 • Student 4 Incorrect None of these are the boiling point of water on the Celsius scale.
1 2 3 4 Students were doing a lab to find the melting point of ice. Which thermometer would show the temperature in o Celsius at which ice would begin to melt? • Thermometer 1 • Thermometer 2 • Thermometer 3 • Thermometer 4
1 2 3 4 Students were doing a lab to find the melting point of ice. Which thermometer would show the temperature in o Celsius at which ice would begin to melt? The correct answer is C because ice melts above 0o C and the question asks at what temperature ice would begin to melt.
1 2 3 4 Students were doing a lab to find the melting point of ice. Which thermometer would show the temperature in o Celsius at which ice would begin to melt? Answer A is incorrect because water boils at 100° C.
1 2 3 4 Students were doing a lab to find the melting point of ice. Which thermometer would show the temperature in o Celsius at which ice would begin to melt? Answer B is incorrect because the thermometer reads 50°C.
1 2 3 4 Students were doing a lab to find the melting point of ice. Which thermometer would show the temperature in o Celsius at which ice would begin to melt? Answer D is incorrect because the thermometer reads -5° C.
Freezing and Boiling • Draw a picture of two Celsius thermometers. On one thermometer show the freezing temperature of water. On the other thermometer show the boiling temperature of water. Add this to your science journal.
