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# What does a flat line on a heating curve represent?

## What does a flat line on a heating curve represent?

4. Answer: B Explanation: The plateaus or horizontal lines on the graph represent the transition between states of the sample. The first plateau represents the melting (or transition from solid to liquid) and the second plateau represents boiling (or transition from liquid to gas).

## Why does the heating curve go flat?

The average energy of the particles is increasing as the temperature rises. The heating curve shows that the temperature stays constant until the solid is completely melted. The melting process requires a lot of energy.

How would you describe the heating curve of a substance?

A heating curve is a plot or graph wherein a substance is subjected to increasing temperature against time to measure the amount of energy it absorbs and changes state with increasing temperature. When heated, the system absorbs the energy. This, then, causes the system to change its state.

What is the shape of the heating curve?

A heating curve begins from a theoretical zero and goes up in a diagonal line. As the temperature increases, it goes up. When it starts, bose-einstein condensate becomes a solid and reaches a melting point.

### What is the aim of heating and cooling curve of water?

A heating curve of a substance gives the changes in temperature as we move from a solid to a liquid to a gas. A cooling curve gives the changes in temperature as we move from gas to liquid to solid.

### What is the definition of heating curve?

A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.

Why does a cooling curve appear as a horizontal line?

For the time it takes for the phase transition to occur, the temperature remains constant, as the cooling is counteracted by the energy released by forming new bonds in the substance. Because of this, phase transitions appear as horizontal lines. Figure 1: Cooling curve for pure substance.

What does a heating curve represent in chemistry?

A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it.

## How are plateaus related to heating and cooling curves?

From- http://www.dlt.ncssm.edu/TIGER/Flash/phase/HeatingCurve.html Notice that, in general, the temperature goes up the longer the heating continues. However, there are two horizontal flat parts to the graph. These happen when there is a change of state. The plateaus are also called phase changes.

## Which is the first phase change in the heating curve?

Looking from left to right on the graph, there are five distinct parts to the heating curve: Solid ice is heated and the temperature increases until the normal freezing/melting point of zero degrees Celsius is reached. The first phase change is melting; as a substance melts, the temperature stays the same.