Which sentence contains an infinitive?
1. clayton asked his mother if he could take the bus to the skate park.
2. although she was busy, clayton's mother offered to give him a ride.
3. after sending an email to her boss, clayton's mother grabbed her keys.
4. when clayton got to his mother's car, he noticed she had a flat tire.

The sentence that contains an infinitive is 2. Although she was busy, Clayton's mother offered to give him a ride.

An infinitive phrase contains a verb in its infinitive form after the preposition "to". In this case, the infinitive phrase is "to give".

Even though the sentences in the other options contain the preposition "to", the preposition is not followed by a verb in its infinitive form. The preposition "to" is followed by noun phrases like "the skate park", "her boss" and "his mother's car".

Making and breaking of bonds are examples of chemical reaction. Chemical bonding is the process in which chemical bonds are formed and the process of breaking of bonds is called chemical dissociation.

It takes energy to break the chemical bond between the reactants and the making of new bonds gives the energy. Therefore breaking of bond is an endothermic process and making of bond is an exothermic process.

Bonds breaks when a particular amount of energy is given to it and this energy is called the bond energy.