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What do you call the change in state of matter from a liquid to a gas?
Condensation
When heat is absorbed is it a chemical change?
No. Rather released. As during the physical changes in the states of matter, there is breaking of bonds involved. Whenever bonds are broken, the atoms of that matter come closer and energy they give out is more as compared to energy taken while breaking bonds. Hence, Physical changes at the level of states of Matter are always Exothermic i.e. RELEASING HEAT.
What is the amount of energy given off or absorbed when electrons change energy states equal to?
The amount of energy given off or absorbed when electrons change energy states is equal to the difference in energy levels between the initial and final states of the electron. This energy is typically released or absorbed in the form of electromagnetic radiation, such as light.
What happens to molecular energy when a substance changes states?
The molecular energy will usually increase or decrease, depending on the exact situation.
What is the best definition of the enthalpy of formation?
The enthalpy of formation is defined as the change in enthalpy when one mole of a compound is formed from its constituent elements in their standard states. It is a measure of the energy released or absorbed during the formation of a substance. This value is crucial in thermodynamics and helps in predicting the feasibility of chemical reactions. The standard enthalpy of formation for elements in their standard states is defined as zero.
What happens when a substance change states?
When a substance changes state, Energy within the substance is gained or lost, but the composition is unchanged.
When a substance changes states at different temperature and pressure this is called?
pasterisation
What change is melting consider because energy is gained by the substance as it changes states?
Melting is known as a phase change because energy is absorbed by the substance as it transitions from solid to liquid. This added energy breaks the bonds holding the particles in a fixed position, allowing them to move more freely.
How does energy play a part in matter changing state?
Energy directly relates the the temperature of a substance. The more energy in is proportional to a higher temperature. The inverse is also true. When changing states you must use the formula Q=ML where Q is the energy in Jules, M is the mass in grams and L is the latent heat (fusion or vaporization) of the substance. This determines how much energy is needed to change state.
What best describes the enthalpy of formation of a substance?
The energy change that happens when a substance forms from its elements (APEX)
What do you call the change in state of matter from a liquid to a gas?
Condensation
Is the solid state of water a Physical property or a chemical property?
When a substance changes states the chemical make-up of the substance is still the same, so the state of the substance would be a physical property.
When heat is absorbed is it a chemical change?
No. Rather released. As during the physical changes in the states of matter, there is breaking of bonds involved. Whenever bonds are broken, the atoms of that matter come closer and energy they give out is more as compared to energy taken while breaking bonds. Hence, Physical changes at the level of states of Matter are always Exothermic i.e. RELEASING HEAT.
What is the amount of energy given off or absorbed when electrons change energy states equal to?
The amount of energy given off or absorbed when electrons change energy states is equal to the difference in energy levels between the initial and final states of the electron. This energy is typically released or absorbed in the form of electromagnetic radiation, such as light.
What are Factors affecting state of a substance?
Factors affecting the state of a substance include temperature, pressure, and the intermolecular forces between the particles of the substance. Changes in these factors can lead to a substance transitioning between solid, liquid, and gas states.
Are the atoms in a substance the same if the substance changes states?
On heating there will be a change in the physical state not chemical composition. So the number of atoms will be the same even after change in state.
What 2 states of matter are endothermic changes?
The two states of matter that involve endothermic changes are solid to liquid and liquid to gas. In these processes, energy is absorbed from the surroundings to break the intermolecular forces holding the particles together, resulting in an increase in temperature.
