Difference between revisions of "Endothermic"
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: [[Melting]], [[Evaporating]] and [[Subliming]] are [[endothermic]] changes because they need [[energy]] to happen. The [[material]] has more [[energy]] at the end than it did the beginning. However, there is usually no decrease in [[temperature]] because the [[material]] is usually being heated to [[State Change|change state]]. | : [[Melting]], [[Evaporating]] and [[Subliming]] are [[endothermic]] changes because they need [[energy]] to happen. The [[material]] has more [[energy]] at the end than it did the beginning. However, there is usually no decrease in [[temperature]] because the [[material]] is usually being heated to [[State Change|change state]]. | ||
: [[Dissolve|Dissolving]] is an [[endothermic]] process as [[energy]] is needed to break the [[bond]]s in the [[solid]] [[solute]] to [[dissolve]]. This causes the [[solution]] to decrease in [[temperature]] while the [[solute]] is [[dissolve|dissolving]]. | : [[Dissolve|Dissolving]] is an [[endothermic]] process as [[energy]] is needed to break the [[bond]]s in the [[solid]] [[solute]] to [[dissolve]]. This causes the [[solution]] to decrease in [[temperature]] while the [[solute]] is [[dissolve|dissolving]]. | ||
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| + | ==Key Stage 4== | ||
| + | ===Meaning=== | ||
| + | An [[endothermic]] process is one takes in [[energy]]. This usually causes surroundings to decrease in [[temperature]]. | ||
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| + | ===About Endothermic Processes=== | ||
| + | ====Foundation==== | ||
| + | : [[Endothermic]] [[Chemical Reaction|reactions]] usually require [[energy]] to begin. This is called the [[Activation Energy|activation energy]]. | ||
| + | : In an [[endothermic]] process the [[Potential Energy|potential energy]] stored in the [[reactant]]s is less than the [[Potential Energy|potential energy]] stored in the [[product]]s. | ||
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| + | {| class="wikitable" | ||
| + | |- | ||
| + | |[[File:EndothermicSketchGraphKS4.png|center|500px]] | ||
| + | |- | ||
| + | | style="height:20px; width:500px; text-align:center;" |To start the [[Chemical Reaction|reaction]] an [[Activation Energy|activation energy]] is needed. This is usually achieved by initially [[heating]] the [[reactant]]s. Once the [[Chemical Reaction|reaction]] starts, since the [[energy]] stored in the [[reactant]]s less than the [[energy]] stored in the [[product]]s, this means the [[Chemical Reaction|reaction]] must take in [[energy]] from the environment which causes the surroundings to decrease in [[temperature]]. | ||
| + | |} | ||
| + | ====Higher==== | ||
| + | : In a [[Chemical Reaction|chemical reaction]] [[energy]] is needed to break the [[Chemical Bond|chemical bonds]] holding the [[atom]]s together. | ||
| + | : In an [[endothermic]] [[Chemical Reaction|reaction]] [[energy]] is then [[Absorb (Physics)|absorbed]] as [[atom]]s form new [[Chemical Bond|chemical bonds]]. | ||
| + | : This happens because there is less [[energy]] stored in the [[Chemical Bond|chemical bond]]s of the [[reactant]]s than the [[product]]s. | ||
Revision as of 15:34, 14 January 2019
Contents
Key Stage 3
Meaning
An endothermic process is one takes in energy. This usually causes surroundings to decrease in temperature.
About Exothermic Processes
- A few chemical reactions are endothermic with means they need energy from the environment and this is observed by a decrease in temperature.
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| The energy stored in the reactants less than the energy stored in the products. This means the reaction must take in energy from the environment which causes the surroundings to decrease in temperature. |
- Melting, Evaporating and Subliming are endothermic changes because they need energy to happen. The material has more energy at the end than it did the beginning. However, there is usually no decrease in temperature because the material is usually being heated to change state.
- Dissolving is an endothermic process as energy is needed to break the bonds in the solid solute to dissolve. This causes the solution to decrease in temperature while the solute is dissolving.
Key Stage 4
Meaning
An endothermic process is one takes in energy. This usually causes surroundings to decrease in temperature.
About Endothermic Processes
Foundation
- Endothermic reactions usually require energy to begin. This is called the activation energy.
- In an endothermic process the potential energy stored in the reactants is less than the potential energy stored in the products.
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| To start the reaction an activation energy is needed. This is usually achieved by initially heating the reactants. Once the reaction starts, since the energy stored in the reactants less than the energy stored in the products, this means the reaction must take in energy from the environment which causes the surroundings to decrease in temperature. |
Higher
- In a chemical reaction energy is needed to break the chemical bonds holding the atoms together.
- In an endothermic reaction energy is then absorbed as atoms form new chemical bonds.
- This happens because there is less energy stored in the chemical bonds of the reactants than the products.