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What happens to the molecules in a substance when thermal energy is removed?
When thermal energy is removed from a substance, the molecules lose kinetic energy and slow down. This often causes the substance to cool down as the molecules have less energy to move and vibrate. In extreme cases, the substance may undergo a phase change, such as from a liquid to a solid.
Which is always true of an endothermic reaction?
An endothermic reaction consumes energy, and the reduction of energy does lower temperature. Of course, the actual temperature of the chemicals in question may be subject to other simultaneous influences. If you have a solution in which there is an endothermic reaction taking place, but you are also heating the solution to help drive the reaction, you will not observe a lower temperature.
What does a substance do when it is cooled?
When a substance is cooled, its molecules slow down and have less energy, causing them to move closer together. This often results in the substance contracting or becoming more dense. In some cases, cooling a substance may also lead to a change in state, such as from a gas to a liquid or from a liquid to a solid.
What happens when you add heat in a substance?
When heat is added to a substance, its molecules gain energy and move faster, causing the substance to increase in temperature. This can lead to changes in physical state, such as melting or boiling, depending on the substance's properties. In some cases, chemical reactions may also occur due to the increased thermal energy.
An endothermic reaction is one that uses which form of energy?
An endothermic reaction is one that uses chemical energy.
Is it true that temperature is the measure of average kinetic energy of a substance?
Almost. Temperature is a measure of the average kinetic energy of the particles which constitute the substance. So the temperature of a block of Sodium Chloride is a measure of the average kinetic energy of the sodium and the chlorine ions which constitute the block, but temperature has nothing to do with the kinetic energy of the whole block, which may be dashing through the air at some enormous velocity.
What is a possible result of an atom that absorbs sufficient energy?
The atom may emit a photon.
What are 2 forms of energy that may be absorbed?
Two forms of energy that may be absorbed are light energy, such as from the sun, and thermal energy, which is heat energy. When an object absorbs light energy, it can convert it into other forms of energy, like heat.
What are endothermic changes of state?
Endothermic changes of state refer to processes in which a substance absorbs heat energy from its surroundings, resulting in a change from a lower energy state to a higher energy state. Common examples include melting (solid to liquid), vaporization (liquid to gas), and sublimation (solid to gas). During these transformations, the temperature of the substance may remain constant until the phase change is complete, as the absorbed energy is used to overcome intermolecular forces.
Why may the temperature of a substance change when energy is added?
Thermal energy of a substance is determined by the movement of the molecules and the potential energy of the arrangement of molecules. Heat transfer will stop when thermal equilibrium is reached. It depends upon the substance how long that takes.
What happens to the particles of a substance as you take energy away?
As energy is taken away from a substance, the particles within the substance slow down and lose kinetic energy. Eventually, the particles may form a solid structure as they come closer together due to the reduction of thermal energy.
What happens to the molecules in a substance when thermal energy is removed?
When thermal energy is removed from a substance, the molecules lose kinetic energy and slow down. This often causes the substance to cool down as the molecules have less energy to move and vibrate. In extreme cases, the substance may undergo a phase change, such as from a liquid to a solid.
What happens to energy that the ground absorbs in the form of visible sunlight?
The ground absorbs visible sunlight energy and converts it into heat. This heat gets transferred to the surrounding air through conduction and convection. Some of the energy may also be used by plants for photosynthesis.
What happens to particles in a substance as thermal energy decreases?
As thermal energy decreases, the particles in a substance slow down and have less kinetic energy. This may cause them to move closer together, leading to a decrease in the substance's volume or a change in state, such as from a gas to a liquid or a solid.
How does the nuclear energy is turn into other energy such as electrical energy?
When an atom splits one of the forms of energy produced may be heat. This heat may be gathered by circulating a coolant substance such as water around or near the radioactive substance to produce steam. The steam is used to drive a turbine and the turbine drives an electical generator.
What substance in face powder absorbs perspiration and sebum?
Talc is a common substance found in face powder that absorbs perspiration and sebum. Its fine texture allows it to effectively absorb moisture and oil, helping to keep the skin feeling dry and matte. Additionally, other ingredients like mica or cornstarch may also be used for their absorbent properties in various formulations.
What effects does an energy change have on the idenitity of a substance?
An energy change does not alter the identity of a substance. It may cause a physical change (like melting or boiling) or a chemical change (like reactions), but the substance itself remains the same at the molecular level. The energy change only affects the arrangement or movement of particles within the substance.
