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When a substance is undergoing change of state the temperature of the substance does not change until the is complete?
During a change of state, such as melting or boiling, the temperature of the substance remains constant because the heat energy is being used to break intermolecular forces rather than increase the kinetic energy of the particles. Once the change of state is complete, the temperature will start to rise again as thermal energy is being used to increase kinetic energy.
How does the vapor pressure of a substance change with temperature?
The vapor pressure of a substance increases with temperature. As the temperature rises, more molecules have enough energy to escape from the liquid phase and enter the gas phase, leading to an increase in vapor pressure.
Why the temperature does not change as a pure substance melts?
During melting, energy is absorbed to overcome the intermolecular forces holding the substance together instead of increasing the temperature. This energy is used to separate the molecules within the substance rather than increase their kinetic energy and raise the temperature. Once these forces are overcome, the substance can transition from a solid to a liquid at a constant temperature.
When a solid melts does it change into a gas?
No, when a solid melts, it changes into a liquid, not a gas. Melting is the process by which a substance transitions from a solid to a liquid state due to an increase in temperature. The transition from a liquid to a gas is called vaporization.
True or false the temperature of a substance changes during a change in state?
False. The temperature of a substance remains constant during a change in state until all of the substance has completed the phase change.
The speed of the particles in a substance change when what changes?
electrons
A graph that shows the change in the temperature of a substance as it is heated will show?
A graph showing the change in temperature of a substance as it is heated will typically show an initial increase in temperature as heat is added, followed by a plateau where the substance changes phase (e.g., from solid to liquid), and then another increase in temperature. The specific shape of the graph will depend on the properties of the substance being heated.
What is the temperature at which a substance change from a solid into a liquid?
This temperature is called melting point and is different for each substance or material.
What is the temperature at which at a substance change from a liquid to gas?
The answer to this question is entirely dependent on the type of substance. This temperature is called the boiling point.
Heat which causes a change in temperature of substanceis called?
Heat which causes a change in temperature of substance is called specific heat.
What is the effect of temperature change to the amount of heat content of the substance?
The effect of temperature change to the amount of heat content of the substance is called heat transfer. As heat increases, the temperature decreases.
When a substance is undergoing change of state the temperature of the substance does not change until the is complete?
During a change of state, such as melting or boiling, the temperature of the substance remains constant because the heat energy is being used to break intermolecular forces rather than increase the kinetic energy of the particles. Once the change of state is complete, the temperature will start to rise again as thermal energy is being used to increase kinetic energy.
What is the only way the density of a pure substance can change?
The density of a pure substance can change by altering its temperature. As temperature increases, most substances expand and therefore decrease in density, whereas as temperature decreases, most substances contract and increase in density.
What will a graph show if the change in temperature of a substance is heated?
A graph of the change in temperature of a substance as it is heated will typically show an initial increase in temperature until a plateau is reached, known as the phase transition or melting point. After this, the temperature will continue to rise again as the substance transitions to a gas.
What is a change in state from liquid to solid called?
It is usually called freezing, but can also be called solidification. It occurs when the temperature goes below the freezing temperature of a substance and that substance solidifies, or becomes hard.
What is thermal expanison?
Thermal expansion is the tendency of matter to change in volume in response to a change in temperature. When a substance is heated, its particles move faster and the material may expand. Conversely, when the substance is cooled, its particles slow down and the material may contract.
How does a substances temperature change when the average kinetic energy of it's particles increases?
As the average kinetic energy of a substance increases, the temperature will increase.
