Water has three states
Solid (ice)
liquid (water)
gas (steam)
When water is heated it expands and when it is cooled it contracts until about 4 degrees Celsius when it begins to expand again.
So the answer to your question is it depends on what temperature the water is. If it is a liquid and over 4 degrees then it will expand. If it is not frozen but somewhere between 0 and 4 degrees it will contract until about 4 degrees and then expand. Under 0 degrees it is ice not water, over 100 degrees it is steam not water.
The heat of reaction is the total amount of heat released or absorbed during a chemical reaction, while the molar heat of reaction is the heat of reaction per mole of a substance involved in the reaction. The molar heat of reaction allows for comparison of the energy changes between different reactions on a per mole basis.
An exothermic reaction is one in which heat is released or given off as a product of the reaction. This is often associated with a rise in temperature in the surrounding environment.
The reaction shifts to remove the heat APEX
Endothermic reaction is a term that describes a reaction in which heat is part of the reactants. This means that the reaction absorbs heat from its surroundings to proceed.
Heat is written as a product of the reaction (apecs answer)
The heat of reaction is the total amount of heat released or absorbed during a chemical reaction, while the molar heat of reaction is the heat of reaction per mole of a substance involved in the reaction. The molar heat of reaction allows for comparison of the energy changes between different reactions on a per mole basis.
If heat from a reaction is released, it is an exothermic reaction.
This the heat released during a chemical reaction.
Energy is lost from a reaction in the form of heat. This heat is often referred to as exothermic heat, as it is released from the system during the reaction.
Exothermic reaction: with release of heat Endothermic reaction: with absorption of heat
if the reaction is exothermic (creates heat) then adding heat will cause the reaction to run in the reverse direction if the reaction is endothermic (requires heat) then heat will speed it up
An endothermic reaction need heat to occur.
An exothermic reaction is a chemical reaction that gives off heat. In an exothermic reaction, energy is released in the form of heat to the surroundings.
Endothermic reaction. An endothermic reaction absorbs energy from its surroundings in the form of heat, causing a decrease in temperature.
An endothermic reaction absorbs heat from its surroundings, while an exothermic reaction releases heat to its surroundings. The general formula for an endothermic reaction is: reactants + heat β products, and for an exothermic reaction: reactants β products + heat.
A reaction in which heat is produced is called exothermic. A reaction in which heat is absorbed (or one that produces cold) is called endothermic.
An endothermic reaction is a reaction that absorbs heat. This is different from an exothermic reaction, such as combustion, which releases heat.