Cooling And Heating Curves Of A Pure Substance

Each point on the graph represents a pure substance changing into a new state.

Cooling and heating curves of a pure substance.

This class lesson was on the heating cooling curve of a pure substance. The temperature stays the same when a pure substance changes state the horizontal part of the graph shows that the salol. Plateaus in the curve regions of constant. The heating cooling curve of a pure substance so basically what we did today is the heating and cooling curve of a pure substance we also needed to do a flow chart because we might have a lab next class.

While a substance is undergoing a change in state its temperature remains constant. A b turns heat energy to kinetic energy. The sloped areas of the graph represent a. Figure pageindex 1 shows a typical heating curve.

Imagine that you have a block of ice that is at a temperature of 30 c well below its melting point the ice is in a closed container. Just like heating curves cooling curves have horizontal flat parts where the state changes from gas to liquid or from liquid to solid. Heat a substance and measure its temperature for. A solid state at any temperature below its melting point particles packed closely together can only vibrate in a fixed position a b heat energy turns to kinetic energy when heated.

B is the point where it starts to melt. As heat is steadily added to the ice block the water molecules will begin to vibrate faster and faster as they absorb kinetic energy. Heating curves show how the temperature changes as a substance is heated up. In this video i will explain the concept of heating and cooling curves as they applies to water and ethanol.

There are two possibilities. Liquid solid and gas. Drawing a heating curve. Cooling curves are the opposite.

The graph shows the cooling curve for a sample of a compound called salol. A heating or cooling curve is a simple line graph that shows the phase changes a given substance undergoes with increasing or decreasing temperature. A heating curve shows how the temperature changes as a substance is heated up at a constant rate. Temperature is plotted on the y axis while the x axis represents the heat that has been added.

Like many substances water can exist in different phases of matter. They show how the temperature changes as a substance is cooled down.