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Is a liquid endothermic or exothemic?
A liquid on its own cannot be described as either endothermic or exothermic. The terms endothermic and exothermic are the names of two opposite process reactions. An endothermic reaction absorbs heat and and exothermic reaction gives off heat. A liquid can be involved in either an endothermic reaction or in an exothermic reaction. If you are evaporating a liquid from its liquid phase to its gas phase, then the reaction is usually endothermic and vice versa, going from the gas phase to the liquid phase, the reaction is usually exothermic.
How does energy changes as a substances?
Energy can change when a substance undergoes a phase change (such as melting or vaporization) or a chemical reaction. During these processes, energy is either absorbed (endothermic) or released (exothermic) as the internal structure of the substance changes. This energy change is due to the breaking or forming of bonds between atoms, resulting in a change in the overall energy content of the system.
How is vaporization and condensation alike?
Vaporization and condensation are both phase changes of matter. Vaporization involves a substance changing from a liquid to a gas by absorbing energy, while condensation is the reverse process, where a gas changes back into a liquid by releasing energy. Both processes involve a transfer of energy but in opposite directions.
What is it called when there is a temporary change to a solid?
When a solid changes directly to a gas without passing through the liquid phase, it is called sublimation. This process involves the solid absorbing energy and transitioning to a gas due to the increase in kinetic energy of the particles.
What energy changes in an air condition?
In an air conditioner, electrical energy is converted into mechanical energy by the compressor to pressurize and circulate the refrigerant. The refrigerant then undergoes phase changes, absorbing heat from the indoor air (evaporator) and releasing heat outside (condenser), resulting in a transfer of thermal energy. Overall, the air conditioner operates by transferring heat energy from inside to outside the building, thereby cooling the indoor space.
Which phase changes are endothermic?
Based on chemical properties exothermic phase changes are those that release energy. The exothermic phase changes are gas--> liquid, liquid --> solid, and gas--> solid. Looking at a phase diagram if you are going up the "stairs" the conversions require energy going down the "stairs" energy is released.
What are the three phase changes?
The 3 types of endothermic phase changes are the movement from solid to liquid, the movement from liquid to gas, and the movement form gas to plasma. Endothermic is the absorbing of heat.
Where does the thermal energy go in such endothermic phase changes?
It is converted to bond energy
Which phase change is endothermic?
The 3 types of endothermic phase changes are the movement from solid to liquid, the movement from liquid to gas, and the movement form gas to plasma. Endothermic is the absorbing of heat.
What type of phase change does a substance absorb energy from its surroundings?
When a substance absorbs energy from its surroundings, it undergoes a phase change known as endothermic. This results in an increase in the substance's internal energy, allowing it to transition from one state to another (e.g., from solid to liquid or from liquid to gas) by absorbing heat from its surroundings.
What are the phase changes that are endothermic?
For example melting or boiling.
How could you determine if a phase change is endothermic?
To determine if a phase change is endothermic, you can observe whether heat is absorbed during the process. For example, during melting (solid to liquid) or vaporization (liquid to gas), the substance requires energy input, indicating an endothermic change. Additionally, measuring temperature changes with a calorimeter can provide data; if the temperature drops as the phase change occurs, it confirms that energy is being absorbed from the surroundings.
What phase changes are exothermic and what phase changes are endothermic?
exothermic: when the reactants can convert potential energy (stored energy) into kinetic energy. flow of energy into surroundings, surroundings get warmer. the reactants have more energy that the products. energy is lost. the change in enthalpy is negative. the energy sign is on the right side of the arrow (in the equation). exothermic reactions are bond forming endothermic: reactants convert kinetic energy into potential energy during the formation of the products. causes a decrease in temp of the surroundings because it is drawing the heat from it. products have more energy than the reactants. energy is gained. change in enthalpy is positive. the energy sign is on the left side of the arrow (in the equation). endothermic reactions are bond breaking note - enthalpy is another term for potential energy or heat content, the words can be used interchangeably
During what type of phase does a substance absorb energy from its surroudings?
Endothermic
Is bond formation an energy absorbing or an energy releasing process?
Bond formation most often releases energy. but if other reactions or phase changes that release energy occur at the same time, bond formation can absorb energy.
What are the 3 phases of energy metabolism?
The three phases of energy metabolism are: Glycolysis, where glucose is broken down into pyruvate. Citric acid cycle (Krebs cycle), where pyruvate is further broken down to produce energy molecules. Electron transport chain, where energy molecules are used to generate ATP, the cell's energy currency.
Which of the following phase changes is not correctly paired with the sign of its change in enthalpy?
The phase change of sublimation is not correctly paired with the sign of its change in enthalpy. Sublimation involves the transition from solid to gas phase without passing through the liquid phase, and it is an endothermic process where heat is absorbed. The other phase changes—melting (endothermic), freezing (exothermic), vaporization (endothermic), and condensation (exothermic)—are correctly paired with the sign of their change in enthalpy.
