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Gizmo Warm-up Just like magnets, atoms of different elements are attracted together to form chemical bonds. Breaking these bonds requires energy. When a new bond forms, energy is released and temperatures rise. In the Reaction Energy Gizmo™, you will explore how the energy of chemical bonding relates to temperature changes that occur during chemical reactions. In this reaction, hydrogen (H2) and oxygen (O2) react to form water (H2O). The reaction takes place inside a device called a calorimeter. Inside the calorimete a small chamber holds the reactants. The rest of the calorimeter is filled with water. What happens? How does the temperature change?
Activity A:
Energy of chemical bonds
Introduction: The heat energy stored in a chemical system is called the enthalpy (H) of the system. When atoms are joined by a chemical bond, energy must be added to pull them apart. This increases the enthalpy of the system. When a chemical bond forms, energy is released as shared electrons move into lower-energy orbitals. This causes the enthalpy to decrease.

Answer :

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Answer:

(a). Formation of H2O, (b). The temperature increases during the bonding.

Explanation:

The attraction between atoms causes what is known as chemical bonding. Whenever atoms bond together like that there is a release of energy and also, when you want to break the bonds energy will be released too.

During the FORMATION of H2O from Hydrogen molecules and oxygen molecule above the TEMPERATURE INCREASES and after the formation of water the temperature slows down.

Also note that the ENERGY RELEASED in a Chemical Reaction will increase because heat energy that is to say enthalpy will be released during the reaction.

This experiment can be used in the determination of whether a reaction is exothermic or endothermic.

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