Name Date Chapter 6 Class Reinforcement and Study Guide The Chemistry of Life, continued Section 6.2 Water and Diffusion In your textbook, read about water and its importance. For each statement below,.

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Why is the reaction of methane with oxygen classified as a chemical change?

A chemical change is different than a physical change because in a chemical change the identity of the substance actually changes. Like when methane reacts with oxygen, the products, which are carbon dioxide and water, are completely different substances from the reactants.

3. Explain why resonance structures are used instead of Lewis structures to correctly model certain molecules. the location of electrons in a bond. Resonance structures show delocalized electrons, while Lewis structures depict electrons in a definite location.

Gasoline burns, reacting with oxygen in the atmosphere, generating light, heat, and converting the carbon-based molecules into carbon dioxide gas and water vapor. When substances combine like this and undergo chemical changes, we say that a chemical reaction has occurred.

Burning is a chemical change as new substance is formed with new properties and it cannot be reversed.

Oxygen and wax react with each other when a candle burns, undergoing a combustion reaction that produces carbon dioxide and water vapor alongside light and heat.

During burning, methane combines with oxygen in the air to produce entirely different chemical substances, including the gases carbon dioxide and water vapor. This is an example of chemical change and not physical change.

a A chemical bond between atoms results from the attraction between the valence electrons and of different atoms. (a) a shared electron.

Reaction description 1 molecule of methane in an interaction with 2 molecules of oxygen forms 1 molecule of carbon dioxide and 2 molecules of water. In the reaction process heat energy is released equivalent to 891 kJ.

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