Chemistry

# How can a graph of Temperature v Time be used to fing the melting or boiling poit of a substance?

###### Wiki User

The graph becomes flat, constant temperature, at the melting point and boiling points of a pure substance.

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## Related Questions

Boiling point is the temperature in which a substance in a liquid state turns to a gas state. In a pure substance (an element or 1 compound) that temperature is a unique property. For example, pure water boils at 100 degrees Celsius. Methanol has a boiling point of 64.7 degrees Celsius. In pure substances the temperature time graph makes a plateau. The boiling point is the same as the condensation point (where a gas turns into a liquid) for that substance.

Gold's Melting and Boiling Point ---- Melting Point 1064 degrees celsius ---- Boiling Point 2802 degrees celsius ----

Lab: Melting / Freezing Point of NaphthaleneObjective: In this lab, you will investigate the melting and freezing point of the substance, naphthalene (moth ball flakes). You will heat solid naphthalene and record temperature changes and examine the graph to determine the melting point of the substance. You will then cool naphthalene and record temperature changes in order to determine the Freezing point of the substance Part A: What happens to temperature as naphthalene melts?Objective: As heat is applied to liquid naphthalene, the temperature rises. As the temperature rises, the naphthalene will eventually start to melt. This lab experiment tries to answer the question: what happens to the temperature of naphthalene as it melts? In this lab, you will heat the liquid naphthalene, and record the temperature changes. You will graph the temperature changes before drawing any conclusions.Part B: Determining the freezing point of naphthaleneObjective: Freezing point is a characteristic property of matter. As heat is taken away from a liquid, the temperature of that liquid decreases as the substance begins to freeze. This lab experiment tries to answer the question: what is the freezing point of an unknown liquid (naphthalene)? In this lab, you will cool liquid naphthalene, and record the temperature changes. You will graph the temperature changes before drawing any conclusions.

As a substance changes state the temperature remains constant. The graph above is inaccurate

Boiling water would have a horizontal line graph if time was on the horizontal axis and temperature was on the vertical axis.Water will not change temperature as it changes state - from a liquid to a gas or from a solid to a water.Water can change temperature if it is solid or liquid or gas.

You would need to look at a temperature / pressure graph

The boiling point would be 35 degrees Celsius. Use a graph comparing vapor pressure to temperature, go to the point where propanone is at 48 kpa, and see what the temperature is.

what does a graph of melting point an freezing point of naphthalene look like

Because they both intersect on the cooling curve and heating curve graph. There is equilibrium between the solid to liquid phase and the liquid to solid phase.

"A phase diagram is a graph of pressure versus temperature that shows in which phase a substance exists under different condition of temperature and pressure" -Glencoe Chemistry Book

The Precipitation will be the BAR GRAPH the Temperature will be the LINE GRAPH

The answer is,Fractional distillation is based upon the boiling points of the liquid so that we can identify the liquid when there is a plateau on the graph (when the temperature is the same or close together).

The information that are in a climate graph are temperature and rainfall.

The temperature of the water will not change during a phase transition. If you have seen a graph of temperature versus heat input of water before, you can see that at the freezing point and the boiling point, the temperature remains constant while heat input increases. This is because during the phase transition (such as from solid to liquid), the heat put in will be used to separate the molecules and overcome the electrostatic forces between them, rather than to raise the temperature of the substance. Therefore, at the freezing point, it is possible to have both solid ice and liquid water at the same temperature.

The slope of a temperature vs time graph shows the rate of change of temperature. The slope will be positive if the temperature is increasing with time and negative if it is decreasing.

The flat line means there is a phase change....for example from a solid to liquid, the substance is melting....from liquid to gas the liquid is being heated to form the gas.

Using a True Boiling Boint (TBP) test, and ASTM D86 test, or and ASTM 1160 test. Usually the result is a graph of temperature vs. volume% distilled.