It depends how warm or how cold. It ferments in both, to a point, and the warm batch will ferment faster as long as it is not to warm.
warm water - yeast needs warm water to become active. suger is the yeast's food .it gives the yeast the energy it needs to grow. cold water - the cold water kills the yeast (kind of) normal room temperature - the yeast just becomes in active and doesn't react
A reaction with water (hot or cold) is a chemical reaction.
Carbon dioxide is the result of aerobic(oxygenated) respiration of yeast along with ethanol, as long as there is sugar and oxygen the yeast will produce CO2 but will cease if it is too hot/cold or if ethanol levels rise high enough to kill the yeast
potassium hydroxide
Even in cold water sugar will dissolve eventually, but it does dissolve faster in hot water. Hot water molecules move faster than cold water molecules and therefore can more easily break sugar molecules out of solid sugar and into solution.
warm water - yeast needs warm water to become active. suger is the yeast's food .it gives the yeast the energy it needs to grow. cold water - the cold water kills the yeast (kind of) normal room temperature - the yeast just becomes in active and doesn't react
When yeast is in cold water, it goes dormant. If the water is too cold, though, it will kill the yeast.
Yeast needs an appropriate temperature, water, and sugar to be active. If it does not have those three things, it will be inactive.
alkali metals react violently in cold water
All metals, if they do react with water at all, react faster in steam than in water. However, the metals that react SLOWLY with cold water are the metals from Group-IIA(Magnesium, Calcium, etc).
Iron will slowly rust in cold water.
Yeast is a living organism and must have a warm environment to grow. If it's too cool it doesn't make the bubbles you need to make the baked goods rise.
Warm water is best for yeast because yeast is a living organism that likes to live in similar temperatures to humans. Put yeast in hot water and it dies, put it in cold water and it will not do its job properly (will be too cold to reproduce fast etc). Put it in water that is just right and it will thrive
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A reaction with water (hot or cold) is a chemical reaction.
Carbon dioxide is the result of aerobic(oxygenated) respiration of yeast along with ethanol, as long as there is sugar and oxygen the yeast will produce CO2 but will cease if it is too hot/cold or if ethanol levels rise high enough to kill the yeast