Web Analytics
shakeshia
Answered

Which of the following is an exothermic reaction?

Adissolving ammonium nitrate in water to cool the water
Bdissolving sugar in water
Cmelting ice
Doxidation of iron

Which of the following is an exothermic reaction?

Adissolving ammonium nitrate in water to cool the water
Bcondensation
Cdissolving sugar in water
Dmelting ice

What type of substance would be best for use in a cooling system?

Aa liquid with a low specific heat
Ba liquid with a high specific heat
Ca solid with a high specific heat
Da gas with a low specific heat

Verified Answer :

Chemical reactions can be broadly classified into two categories from the context of heat requirement. These include; endothermic and exothermic reactions.

Endothermic reactions proceed with the absorption of heat while exothermic reactions are accompanied by the evolution of heat.

1) Oxidation of iron involves reaction of elemental iron with oxygen to form iron oxide (rust). This is essentially a corrosion reaction in which the metallic bonds in Fe are broken and new bonds between Fe and O are formed, This is an exothermic reaction

4Fe + 3O2 → 2Fe2O3

Ans D)

2) The process of condensation i.e. phase change liquid to solid (or gas to liquid) involves release of heat to the surroundings, hence it will be an exothermic reaction.

Ans B)

3) Specific heat is the amount of heat required to raise the temperature of 1 g of a substance by a 1 C. Typically, liquids and gases are used as coolants. For a coolant to be efficient, it must have a high specific heat.

Ans B)

ayfat23

An exothermic reaction is  oxidation of iron.

An example of exothermic reaction is condensation.

The type of substance that would be best for use in a cooling system is  a gas with a low specific heat,

  • An exothermic reaction can be regarded as a reaction which involves the release  of heat to the surrounding example is oxidation of iron.

A cooling system, can be regarded as a system that keeps temperature of a structure or device at normal value for needs of safety and efficiency, however, a substance such as gas with a low specific heat, is usually used in this system.

Therefore, option D,B,D are correct respectively.

Learn more about exothermic reaction at;

https://brainly.com/question/972207