SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Label each change as a chemical or physical change Hydrogen and oxygen combined to make hydrogen peroxide
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Chemical
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Physical
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Hydrogen and oxygen combine together to form water is a chemical change. When a new substance is formed the change is called a chemical change.
Detailed explanation-2: -The decomposition (breakdown) of hydrogen peroxide (H2O2) to form water (H2O) and oxygen gas (O2) is an example of chemical change.
Detailed explanation-3: -When molecular hydrogen (H2) and oxygen (O2) are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide.
Detailed explanation-4: -So, the hydrogen peroxide fizzing on a wound is a chemical change where hydrogen peroxide is converted to water and oxygen gas (change in chemical composition).
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