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Why does methanol show an exothermic reaction with water at room temperature while it gives an endothermic reaction with water in cold conditions?
Methanol can form hydrogen bonds with water molecules, leading to an exothermic reaction due to the release of energy when the bonds are formed. In colder conditions, the stronger hydrogen bonds between water molecules dominate, requiring energy to break these bonds to accommodate methanol molecules, resulting in an endothermic reaction.
What equation show exothermic reaction?
An exothermic reaction is represented by an equation in which the products have lower energy than the reactants. This is typically indicated by the release of heat as a product in the reaction. For example: A + B → C + heat.
What are exothermic and endothemic reaction?
An exothermic reaction releases heat energy to its surroundings, resulting in an increase in temperature. An endothermic reaction absorbs heat energy from its surroundings, leading to a decrease in temperature.
What type of display would show the changes in temperature throughout an exothermic reaction most clearly and why?
A line graph would most clearly show the changes in temperature throughout an exothermic reaction. This type of display effectively illustrates the continuous changes in temperature over time, allowing for easy identification of trends and specific points of interest, such as peaks in temperature. Additionally, the slope of the line can indicate the rate of temperature change, providing valuable insights into the reaction dynamics.
What information does an energy diagram give?
It shows whether the reaction is exothermic or endothermic.
To show the rusting of iron?
Rusting of iron is an oxidation reaction in the presence of water.
If the value of the enthalpy change is negative this will show heat has been released and if the value is positive this will show heat has been absorbed.?
That's correct! A negative enthalpy change indicates an exothermic reaction, where heat is released into the surroundings. Conversely, a positive enthalpy change signifies an endothermic reaction, where heat is absorbed from the surroundings. This relationship is central to understanding thermal processes in chemistry.
What happens to the temperature of a substance that is an endothermic reaction?
In an endothermic reaction, the temperature of the substance decreases because it absorbs heat from its surroundings in order to proceed. This absorption of heat causes the surroundings to cool down while the substance itself gains energy to facilitate the reaction.
What information is given in a thermochemial equation?
A thermochemical equation provides information about the reactants and products of a chemical reaction, along with the enthalpy change (ΔH) associated with the reaction. It specifies whether the reaction is exothermic (releasing heat) or endothermic (absorbing heat) by indicating the sign of ΔH. Additionally, it often includes the states of matter for each substance involved, such as solid, liquid, or gas, and may show the conditions under which the reaction occurs.
What do half-reaction show?
They show the oxidation an reduction half's of a reaction seperately
What is the balanced equation of phosphorus trichloride reacting with chlorine?
show you the balance reaction between water and phsphorous trichloride show you the balance reaction between water and phsphorous trichloride show you the balance reaction between water and phsphorous trichloride
How do fireworks demonstrate the transformation of energy?
The energy transformation during fireworks show are, fireworks convert chemical energy into light and sound energy.
