Multiple Choice
Which set of coefficients correctly balances the chemical equation for the complete combustion of methane (CH_4)?CH_4 + O_2 → CO_2 + H_2O
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3. Chemical Reactions
Combustion Analysis
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Which of the following provides evidence that burning sugar is a chemical reaction?
A
The sugar crystals melt but retain their chemical identity
B
The production of new substances such as carbon dioxide and water
C
The sugar changes color due to light exposure
D
The sugar dissolves in water
Verified step by step guidance1
Understand that a chemical reaction involves the formation of new substances with different chemical properties from the original substances.
Analyze each option to see if it indicates the formation of new substances or just a physical change:
Melting sugar crystals is a physical change because the chemical identity of sugar remains the same; only the state changes.
The production of new substances such as carbon dioxide and water indicates a chemical reaction because new compounds are formed from the original sugar.
Changing color due to light exposure or dissolving in water are physical changes, as the sugar's chemical identity does not change in these processes.
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