When an electric current is passed through water during the process of eletrolysis two gases are formed. One gas has a boiling point of -183°C and the other has a boiling point of -253°C. Has a physical change or a chemical change occurred? Explain.
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OwO, you didn't look. I looked below and Bob Pursley posted the answer in April 2018.
To determine whether a physical or chemical change has occurred during electrolysis, we need to understand the concepts of physical and chemical changes.
A physical change refers to a change in a substance that does not alter its chemical composition. In other words, the identity of the substance remains the same, but its physical properties, such as its state or shape, may change. Examples of physical changes include changes in state (e.g., melting, boiling), changes in shape, or changes in size.
A chemical change, on the other hand, refers to a change in a substance in which the original substance is transformed into one or more new substances with different chemical properties. In a chemical change, the atoms or molecules rearrange themselves, leading to the formation of new bonds and the formation of new substances.
In the given scenario of passing an electric current through water during electrolysis, two gases are formed. These gases have different boiling points: -183°C and -253°C. As boiling point is a physical property, the formation of different gases with different boiling points suggests that a chemical change has occurred during electrolysis.
During electrolysis of water (H2O), the water molecules (H2O) are broken down into hydrogen gas (H2) and oxygen gas (O2). This reaction involves the breaking of chemical bonds within water molecules (H-O-H) and the formation of new bonds between hydrogen atoms (H-H) and oxygen atoms (O=O). This rearrangement of atoms and the formation of new molecules represent a chemical change.
Therefore, in this specific case, the formation of hydrogen and oxygen gases with different boiling points during electrolysis of water indicates a chemical change has occurred.