is milk turning sour a chemical or physical change

Best answer


Chemical change

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  • Is the souring of milk a chemical change?

  • The souring of milk is classified as a chemical change because it results in the production of sour-tasting lactic acid. Both physical and chemical changes closely relate to physical and chemical properties. A chemical change occurs at a molecular level. Is cheese a chemical reaction?

  • Why does milk turn sour when it is boiled?

  • Explanation: When milk turns sour, what is actually happening is that bacteria are converting the lactose sugars in milk into energy, with lactic acid as a byproduct. This is a chemical process, as new substances (lactic acid) has been formed.

  • What happens to lactose in milk when it turns sour?

  • When milk turns sour, what is actually happening is that bacteria are converting the lactose sugars in milk into energy, with lactic acid as a byproduct. Related questions.

  • What are the similarities between physical and chemical changes?

  • Both physical and chemical changes closely relate to physical and chemical properties. A chemical change occurs at a molecular level. For a change to qualify as chemical a new substance has to be formed and energy is either absorbed or given off. A physical change is characterized with states of matter and energy.

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