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When water molecules at the surface gain sufficient energy they can escape in the atmosphere. Evaporation (not vaporization) occur at any temperature; a higher temperature increase the rate of evaporation. The energy of water molecules increase by a temperature increase and some molecules at the surface can escape in the atmosphere.
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What happens to the energy when a material evaporates or melts?
When a material evaporates or melts, the energy is used to break the intermolecular forces between the molecules of the substance. This energy is known as latent heat. In the case of melting, the energy breaks the solid's crystal lattice structure to transform it into a liquid form. In the case of evaporation, the energy is used to overcome the attractive forces between molecules to convert the liquid into a gas.
What do you think happens to the atoms of a substance when it undergoes combustion?
During combustion, the atoms of a substance react with oxygen to form new molecules, releasing energy in the form of heat and light.
Does the amount of heat in a substance depend on the motion of the molecules?
Yes, the amount of heat in a substance is related to the motion of its molecules. Heat is a form of energy that corresponds to the motion of molecules within a substance. The more heat a substance has, the faster its molecules move.
What happens to thermal energy if the molicules speed up?
If molecules speed up, they gain kinetic energy which increases the thermal energy of the substance. This causes the temperature of the substance to rise since thermal energy is directly related to the average kinetic energy of the molecules.
What is the average amount of of energy of motion in the molecules of a substance?
The average amount of energy of motion in the molecules of a substance is represented by the temperature of the substance. This is a measure of the average kinetic energy of the molecules within the substance.
What happens when a substance changes from a liquid to a vapor?
It evaporates?
When a substance evaporates what happens to its mass?
Its mass is unchanged.
Why is there no chemical equation to describe what happens when water evaporates?
That's because there is no chemical change. In most cases, there is no chemical change when a substance evaporates. The exception is very long molecules, which may break apart during evaporation.
Does a substance gain o lose thermal energy when it evaporates?
A substance gains thermal energy when it evaporates, as energy is required to break the intermolecular forces holding the molecules together and allow them to escape into the gaseous phase.
What happens to solute molecules when the solvent evaporates or boils?
When the solvent evaporates or boils, the solute molecules become more concentrated as the solvent decreases. Eventually, the solute may reach a point where it precipitates out of the remaining solvent as a solid.
What happens to molecules when a substance changes from a liquid to a gas?
they get further apart
What happens to the molecules of a substance as it moves from a liquid to a solid?
use your book
What happens to atoms of A substance when heat is added?
When heat is added to a substance, the molecules and atoms vibrate faster.
What happens to the molecules of a substance when it is melted?
the molecules vibrate, faster and faster as the heat increases then they become disordered
What happens to ions after salt water evaporates?
When salt water evaporates, the water molecules dissipate into the air, leaving behind the salt ions. These ions will eventually form salt crystals as the remaining water evaporates completely.
What happens to the energy when a material evaporates or melts?
When a material evaporates or melts, the energy is used to break the intermolecular forces between the molecules of the substance. This energy is known as latent heat. In the case of melting, the energy breaks the solid's crystal lattice structure to transform it into a liquid form. In the case of evaporation, the energy is used to overcome the attractive forces between molecules to convert the liquid into a gas.
What happens to a colour of a solute molecules when the solvent evaporates or boils?
The color of an anhydrous compound is sometimes different from the hydrated compound.
