Complete the assignment.
Predict:
What will happen if we drop the dye into the ice water, cold water, and hot water?
ICE-
COLD-
HOT-
In a complete sentence, record your observations for the dye in ice water, cold water, and hot water after the one-minute mark.
ICE-
COLD-
HOT-
In a complete sentence, record your observations for the dye in ice water, cold water, and hot water after the 3-minute mark.
ICE-
COLD-
HOT-
In a complete sentence, record your observations for the dye in ice water, cold water, and hot water after the 5-minute mark.
ICE-
COLD-
HOT-
Match the molecular motion (speed) of the water molecules.
Drag the vocabulary (with six dots) up and down to the correct image!
| Stavka koja se može prevući | arrow_right_alt | Odgovarajuća stavka |
|---|---|---|
hot water particles | arrow_right_alt | |
ice water particles | arrow_right_alt | |
cold water particles | arrow_right_alt |
Which do you think has the most energy?
Match the correct descriptions to the images of the dye (black dots) and the water molecules (white dots) at the 1 minute mark!
| Stavka koja se može prevući | arrow_right_alt | Odgovarajuća stavka |
|---|---|---|
Cold Water Molecules + Dye | arrow_right_alt | |
Ice Water Molecules + Dye | arrow_right_alt | |
Hot Water Molecules + Dye | arrow_right_alt |
Which particles move the dye the slowest? Explain your answer.
Provide an explanation for what temperature measures. Support your explanation with evidence.
Predict:
What happens when we mix hot water and cold water?
Part 1: Measuring Temperature
1). Set up the LabQuest with the temperature probe.
2). Fill up a foam cup about half full of ice-cold water, but be sure that there is no solid ice in the cup.
3). Fill a second foam cup half full of hot water
4). Measure the temperature in the cup. Record these values in Table 1 along with the time of day to the minute.
5). While you are waiting, do questions, 13-15.
Consider that the temperature describes a type of energy.
Do you think hot or cold water has more of this kind of energy? Explain in one sentence why you think so.
How do you expect the temperature of the water in each of the two cups to change over time?
Describe the flow of energy that would cause the changes you predicted in question 14.
Measure the temperatures in each cup and see whether the actual temperatures change as you expected.
Part 3: Making heat flow
1). Prepare a small foam cup with 50 g of hot water
2). Prepare a second small foam cup with 50 g of cold water
3). measure the temperatures in each cup just before you mix them in Step 4
4). Mix the hot and cold water into the larger (empty) foam cup
5). Stir the mixture with the temperature probe quickly and record the temperature of the mixture when the temperature stops changing
Which cup of water had more energy: the one with hot water or the one with cold water? Why?
What did you think the temperature of the mixture would be? Why?
If the system includes both cold and hot water, compare the energy of the system before mixing to the energy after mixing. You may ignore the energy going into the air or lost from friction.
