Question

Which statement correctly describes a chemical reaction?
O Reactants come out of a reaction.
O Energy is always released.
O Bonds between atoms break and new bonds form.
O Products go into a reaction.

Answer 1

Answer:  Bonds between atoms break and new bonds form.

Explanation:

Bonds between atoms break and new bonds form. Chemical reaction is the rearrangement of atoms to form new substances. The bonds in the reactants first break so that atoms may be free to rearrange and form new bonds resulting in the products.

Answer 2

The best answer is 3


Bonds are made of energy. There are certain energy changes that occur during the making or breaking of bonds and this is called enthalpy changes. When a bod is broke, energy is required to break the bond, hence energy is taken in or absorbed when bonds are broken. This makes bond breaking an endothermic process.