Question

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graph the heating curve of water with the following conditions:

1. a 30 gram sample of ice starts at -40°c and is heated at a constant rate.
2. it is heated to its melting point in 2 minutes, at which point it takes 7.99 minutes for it to completely melt.
3. once the sample is completely liquid, it continues heating up until it reaches its boiling point in 10 minutes.
4. at which point it takes 54 minutes to completely vaporize.
5. once the sample is completely gas, it continues to heat to 130°c in 1.44 minutes.

include: graph title, axes titles (with units), labels for each state of matter and each phase change

Explanation:

Step1: Determine the axes titles

The x - axis is for time (in minutes) and the y - axis is for temperature (in °C).

Step2: Mark the key points

• Start at (-40°C, 0 minutes).
• Melting point (0°C) is reached at 2 minutes.
• Finished melting at 2 + 7.99 = 9.99 minutes (still at 0°C).
• Boiling point (100°C) is reached at 9.99+10 = 19.99 minutes.
• Finished vaporizing at 19.99 + 54=73.99 minutes (still at 100°C).
• Reached 130°C at 73.99+1.44 = 75.43 minutes.

Step3: Label the states and phase changes

• From 0 - 2 minutes: Ice (solid), heating (upward - sloping line).
• From 2 - 9.99 minutes: Melting (horizontal line at 0°C).
• From 9.99 - 19.99 minutes: Water (liquid), heating (upward - sloping line).
• From 19.99 - 73.99 minutes: Boiling (horizontal line at 100°C).
• From 73.99 - 75.43 minutes: Steam (gas), heating (upward - sloping line).

Answer:

• Graph Title: Heating Curve of a 30 - gram Water Sample
• X - axis Title: Time (minutes)
• Y - axis Title: Temperature (°C)
• Labels:
• 0 - 2 minutes: Ice (solid), heating
• 2 - 9.99 minutes: Melting (solid - liquid phase change)
• 9.99 - 19.99 minutes: Water (liquid), heating
• 19.99 - 73.99 minutes: Boiling (liquid - gas phase change)
• 73.99 - 75.43 minutes: Steam (gas), heating

To graph:

1. Plot the points (-40,0), (0,2), (0,9.99), (100,19.99), (100,73.99), (130,75.43).
2. Connect the points with line segments as described in the steps above.