chem help!! have to make a graph. need help plzz.. thank you!!!! fastttt!!. Make sure to label axes and title the graph. its A heating curve?
Temperature measurements were taken every minute for 35 minutes.
Table 1. Heating of Substance Y.
Time(min) Temp(°C) Time(min) Temp(°C)
0.0 15.2 19.0 92.5
1.0 19.8 20.0 98.7
2.0 24.7 21.0 107.0
3.0 29.2 22.0 109.1
4.0 31.3 23.0 109.4
5.0 32.2 24.0 109.3
6.0 32.0 25.0 109.3
7.0 32.1 26.0 109.3
8.0 32.1 27.0 109.4
9.0 32.1 28.0 109.3
10.0 32.2 29.0 109.4
11.0 35.4 30.0 110.5
12.0 45.0 31.0 111.8
13.0 54.6 32.0 119.6
14.0 61.2 33.0 127.1
15.0 66.8 34.0 133.4
16.0 75.0 35.0 139.7
17.0 83.7
18.0 88.1
1. What is the melting point of this substance? How do you know?
2. What is the boiling point of this substance? How do you know?
3. What phase(s) is/are present at each of the following points in time?
a) 2 min b) 6 min c) 17 min d) 26 min e) 34 min
4. Explain why at the intervals of 5-10 min and 23-29 min the substance is being heated but the temperature is not increasing.
5. Explain how the length of the plateaus in the graph could be changed. (Give at least two ways)
We can't draw diagrams on this forum. You can look up on Google and find heating curves and see the place for phase changes, melting points, etc.
To make a graph of the temperature measurements, follow these steps:
1. Start by labeling the x-axis with "Time (min)" and the y-axis with "Temperature (°C)."
2. Plot the given data points on the graph, with time on the x-axis and temperature on the y-axis.
3. Connect the data points with a smooth line to represent the heating curve.
4. Add a title to the graph, such as "Heating Curve of Substance Y."
Now, let's address each question:
1. To determine the melting point of the substance, look for the point at which the temperature starts to increase significantly. In this case, the temperature increases dramatically at around 11 minutes, indicating the melting point.
2. To determine the boiling point of the substance, find the point at which the temperature stops increasing significantly. In this case, the temperature reaches its maximum and plateaus around 139.7°C at 35 minutes, indicating the boiling point.
3. To determine the phase(s) at specific points in time:
a) At 2 minutes, the phase is solid.
b) At 6 minutes, the phase is still solid, as the temperature hasn't reached the melting point yet.
c) At 17 minutes, the phase is liquid, as the substance has already melted.
d) At 26 minutes, the phase is still liquid, as the temperature hasn't reached the boiling point yet.
e) At 34 minutes, the phase is gas, as the substance has reached its boiling point.
4. At the intervals of 5-10 minutes and 23-29 minutes, the substance is being heated but the temperature remains constant. This indicates a phase change occurring. During these time intervals, the heat energy is being used to break the intermolecular forces holding the particles together rather than increasing the kinetic energy of the particles (which would result in a temperature increase). This is known as the latent heat of fusion during the solid to liquid phase change and the latent heat of vaporization during the liquid to gas phase change.
5. The length of the plateaus in the graph can be changed in two ways:
- By using a different substance with a different specific heat capacity, which would alter the amount of energy required for the phase change.
- By changing the rate of heat transfer, either by altering the heating or cooling conditions, affecting the speed of the phase change.