QQuestionChemistry
QuestionChemistry
"When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change.
True
False"
12 months agoReport content
Answer
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Step 1:I'll solve this problem step by step:
Step 2:: Understand the key terms
- Physical change: A change that does not alter the chemical composition of a substance - Chemical change: A change that transforms the chemical composition of a substance
Step 3:: Analyze the statement about milk turning sour
- When milk turns sour, there is actually a chemical change occurring - Souring involves bacterial fermentation, which breaks down lactose into lactic acid - This process fundamentally changes the chemical composition of milk
Step 4:: Evaluate the key characteristics of a chemical change
Chemical changes typically involve: - Formation of a new substance - Change in chemical composition - Irreversible transformation - Often accompanied by: - Color change - Gas production - Temperature change
Step 5:: Determine the nature of milk souring
- Bacterial action converts lactose to lactic acid - Chemical bonds are broken and new molecules are formed - This is definitively a chemical change, not a physical change
Final Answer
Milk turning sour is a chemical change, not a physical change, because the chemical composition of the milk is fundamentally altered during the souring process.
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