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What energy change was observed when a seed is added to a supersaturated solution?
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∙ 8y ago
Nucleation is an endothermic process.
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∙ 8y ago
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What is in instant heat packs?
Instant heat packs contain a supersaturated solution of sodium acetate that heats up when the crystallization process is started by flexing a metal disc embedded in the liquid. Since the liquid is supersaturated (concentration of a solution beyond saturation point), flexing the notched ferrous metal disc makes the solution crystallize suddenly, thereby releasing the energy of the crystal lattice.
What is relation between hydration energy lattice energy and enthalpy of solution?
enthalpy change of solution=enthalpy change of hydration - enthalpy change of lattice
What term describes a solution that contains the maximum amount of soluteit can hold?
A solution that has the maximum amount of solute dissolved at that temperature is known as a saturated solution.However it is possible to prepare a super saturated solution by heating the solution slightly, dissolving the maximum amount of solute and then carefully cooling the solution. Generally the super saturated solution is unstable and the excess solute will precipitate out if given the energy to do so.A common super saturated solution is a sugar solution. Sugar is added to water and the solution is heated and then carefully cooled. The solution can form a glass like solid called "toffee" rather than crystals of sugar.
What happens during fluorescence to the energy which gets absorbed but not emitted as fluorescence by the atom?
If energy is absorbed but not emitted as fluorescence it may:increase the energy of the molecules - manifest as an increase in temperatureuse the energy to power a chemical reaction - manifest as a change in compositionrelease the energy at a wavelength other than that being observed for fluorescence.
What is endothermic solution formation?
exothermic solution is the solution which liberates energy in the form of heat.
A solution in which more solute can dissolve at a given pressure and temperature may best be called?
supersaturated
What is in instant heat packs?
Instant heat packs contain a supersaturated solution of sodium acetate that heats up when the crystallization process is started by flexing a metal disc embedded in the liquid. Since the liquid is supersaturated (concentration of a solution beyond saturation point), flexing the notched ferrous metal disc makes the solution crystallize suddenly, thereby releasing the energy of the crystal lattice.
What is relation between hydration energy lattice energy and enthalpy of solution?
enthalpy change of solution=enthalpy change of hydration - enthalpy change of lattice
What is the overall energy change that occurs when a solution forms?
heat of solution
What term describes a solution that contains the maximum amount of soluteit can hold?
A solution that has the maximum amount of solute dissolved at that temperature is known as a saturated solution.However it is possible to prepare a super saturated solution by heating the solution slightly, dissolving the maximum amount of solute and then carefully cooling the solution. Generally the super saturated solution is unstable and the excess solute will precipitate out if given the energy to do so.A common super saturated solution is a sugar solution. Sugar is added to water and the solution is heated and then carefully cooled. The solution can form a glass like solid called "toffee" rather than crystals of sugar.
Explain an energy transformation you have observed in class.?
An energy transformation I've observed in class is chemical energy from a battery to electrical energy.
Why do some pair of ions in solution form precipitates?
It is a matter of lattice energy vs. heat of solution. The lattice energy is the energy change associated with the ions in the gas phase forming a solid (crystalline) lattice. It is typically an exothermic process, liberating energy. The heat of solution is the energy change associated with the ions being dissolved by solvent, and can be exothermic or endothermic. If the heat of solution is more exothermic than the lattice energy, than it is energetically favorable for the ionic compound to be solvated. If the lattice energy is more exothermic, than solvation will not occur.
What is endothermic change?
endothermic change is a change, in which heat from outside is observed by reactants, leaving the surrounding cooler. Examples are evaporation of water, alcohol and dissolving glucose in water.
How do you get dissolve solid back from water?
You can prepare what is called a supersaturated solution. This is a solution that has more solute in it than "should" dissolve at a particular temperature.Make sure you have a clean and preferably new, unscratched container. Try not to add microscopic scratches to the container when stirring. A new unused glass beaker is ideal and stir with a plastic spatula.Prepare a saturated solution ie dissolve as much solute as you can into the liquid at a particular temperature.Heat the solution to a higher temperature. Your choice but 10 - 20 ºC is fine.Now carefully add more solute and stir. You do not want any solute particles sitting on the base so if you have some, either heat a little more or add a little more liquid.Cover, you do not want dust particles.Allow to cool slowly.You have a supersaturated solution that contains more solid solute than can be dissolved into the liquid. Congratulations.What can go wrong:It crystallises before it cools very much. Solution: do not be so ambitious with the change of temperature. It was too great a load for the solution to carry.One really cool thing to do next is to tap the side of the container, or to scratch the bottom of the beaker with a glass rod, or to drop a single tiny crystal into your supersaturated solution. Bingo, it will instantly drop the extra solute. Why? You provided it with nucleation sites for the crystals to form. It takes a little activation energy for crystals to form, you have to be careful not to provide it when the solution is being prepared. Just a scratch or even a knock will provide the nucleation site or the energy.
How does renewable energy work as a solution?
Renewable energy prevents green house effect, air pollution and climate change. It is achieving sustainability, energy and food security.
How is a chemical change affected by light?
The solution is a bit complicated, it related to atoms and their energy bands.Light is basically photons (moving particles with energy = hf)The photons cause energy levels to jump or drop which is then considered to be a chemical change.
Where the form of energy is observed of mechanical?
Mechanical energy is defined as the sum of kinetic energy + potential energy.
