Why is an endothermic reaction cold?
Of course the heat has to come from somewhere...and it comes from the surroundings. Have you ever used a cold-pack as a first aid device? These are usually solid mixes of ammonium nitrate (and other salts) with a blister of water... When you use it you BREAK the blister, and the water reacts with the ammonium salt.
And because such reaction is entropy rather than enthalpy-driven, heat is taken from the surroundings...
And such a reaction can be used to provide topical relief to swelling or a strain...
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An endothermic reaction is cold because it absorbs heat from its surroundings in order to proceed. As heat is absorbed, it decreases the temperature of the surroundings, resulting in a sensation of coldness.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- The reaction between sodium chloride and water is slightly endothermic. Why does the reaction occur?
- 3A chemical reaction produces 653 550 kJ of energy as heat in 142.3 min. What is the rate of energy transfer in kilojoules per minute.?
- Calculate the amount of energy released when 3.60 kg of butane (C4H10) is burnt in an unlimited supply of oxygen.?
- A piece of gold initially at a temperature of 25.1 °C absorbs 675 J of heat, raising its temperature to 57.4 °C. Assuming the specific heat of gold is 0.126 J/(g°C), what is the mass of the sample?
- What do we call the energy evolved when a gaseous metal cation is hydrated by bulk water?

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