State and temperature of ice with respect to time
Answers
Answer:
What's the Point?
Water can exist in different states; ice is the solid state of water.
Physical properties are characteristics of a substance. They do not change. Physical properties include color, smell, freezing/melting point, and density.
The freezing point of water is the same as the melting point of ice: 32°F (0°C).
Materials
For each child
His/her Ice Investigator Journal
His/her envelope of mobile pieces
Pencil or pen
For each group of four to six children:
1 thermometer that is easily read, preferably in both Celsius and Fahrenheit, and that is safe for use by children
1 (7-ounce) cup or larger plastic container
1 (8-ounce) clear plastic cup
Enough foil to cover the top — but not the sides — of the cup
~5 cups of ice cubes (not crushed ice) (Make sure the ice cubes are loose and not stuck together.)
1 cup of crushed ice
~2 cups of rock salt (the kind used to make ice cream)
1 timer, stopwatch, watch, or clock with a second hand
Paper Towels
For the facilitator:
A permanent marker
2 activity set-ups to use for demonstration purposes (One will be identical to the children's, the other will include all steps but salt will be omitted.)
Background information
Preparation
Check the thermometers to ensure that they are working.
Prepare the activity set-ups you will use for demonstration during the activity.
Activity
1. Introduce the activity by discussing the freezing temperatures of water and the melting temperatures of ice.
At what temperature does water freeze? 32°F (0°C). Ask them about their experiences with ice. Where do they find it? In their freezers. How cold is the freezer? Have they ever observed ice freezing outside? What was the temperature? The children may not know the numerical answer, but they will discover it in the activity. Explain to the children that this is called the "Freezing Point" of water.
Ask the children to make predictions about the melting point of ice.
At what temperature do they think ice melts? Again, the children may or may not know. Invite the children to think about their experiences. Would ice melt on a hot summer day outside in the Sun? What might that warm outside temperature be? Would it melt in the room in which the children are at this moment? Probably (hopefully!). What is the temperature of the room?
Explanation:
State of ice : Solid Temperature : -4ºC to 0ºC
Then: State of Ice: Semi-solid; Temperature : 3ºC to 6ºC
Then: State of Ice: Partly liquid; Temp. : 10ºC to 12ºC
Finally, Liquid State of Ice: Temp. : 15ºC to 20ºC