Cooling And Heating Curves Of A Pure Substance

Drawing a heating curve.

Cooling and heating curves of a pure substance.

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. They show how the temperature changes as a substance is cooled down. The sloped areas of the graph represent a. The graph shows the cooling curve for a sample of a compound called salol.

This class lesson was on the heating cooling curve of a pure substance. B is the point where it starts to melt. Plateaus in the curve regions of constant. So a is a solid state at any temperature below melting point.

The temperature stays the same when a pure substance changes state the horizontal part of the graph shows that the salol. While a substance is undergoing a change in state its temperature remains constant. In this video i will explain the concept of heating and cooling curves as they applies to water and ethanol. Cooling curves are the opposite.

Just like heating curves cooling curves have horizontal flat parts where the state changes from gas to liquid or from liquid to solid. Temperature is plotted on the y axis while the x axis represents the heat that has been added. A typical heating curve for a substance depicts changes in temperature that result as the substance absorbs increasing amounts of heat. A heating curve shows how the temperature changes as a substance is heated up at a constant rate.

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. 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. Each point on the graph represents a pure substance changing into a new state. Liquid solid and gas.

Heating curves show how the temperature changes as a substance is heated up. Changes of state can be investigated by measuring the temperature as a substance changes state. Heat a substance and measure its temperature for. Figure pageindex 1 shows a typical heating curve.

As heat is steadily added to the ice block the water molecules will begin to vibrate faster and faster as they absorb kinetic energy. A heating or cooling curve is a simple line graph that shows the phase changes a given substance undergoes with increasing or decreasing temperature.