no it usually slows down
Cold temperatures generally slow down reaction rates because molecules have less kinetic energy to react with each other. This is in contrast to higher temperatures, which typically increase reaction rates by providing more energy for molecules to collide and react.
Heat generally speeds up the reaction, while cold will slow it down. The enzymes in the cold are frozen.
It usually lowers their effectiveness, i.e. slows the reaction rate.
A catalyst (e.g) MnO2 and Hydrogen Peroxide Concentration (e.g) 5 Molar HCL with react faster than 0.1m Temperature (Magnesium + cold water no reaction)
Precipitation, usually in the form of rain, is a common reaction of a cold front when it meets a hot environment.
Cold Urticaria is the medical term used by health professionals. It is an allergic reaction to cold . It is usually caused by some other underlying health issues with in the body.
A reaction with water (hot or cold) is a chemical reaction.
That would depend highly on the type of chemical reaction. Usually increasing the speed of the molecules by heating, stirring, etc has some effect. However, not all reactions are benefited by this. An example is the formation of carbonic acid. A solution of weak carbonic acid is formed by dissolving carbon dioxide gas in water. Warmer water is incapable of dissolving as much carbon dioxide as cold water and stirring/agitating the water only speeds up the loss of carbon dioxide. Increasing the concentration of reactants usually has good effect, but can be dangerous. Be sure of any reaction BEFORE preforming it.
No they are usually a reaction to a stressed out or lowered immune system. They can also occur after being out in the sun or very cold weather for long periods of time.
Endothermic reaction
endothermic because the energy is absorbed
No, magnesium cannot catch fire in cold water. It reacts only slowly. And only briefly, too, as a film of magnesium hydroxide forms creating a barrier to further reaction.