The souring of milk is a chemical change. Here's why:

1. The process begins when bacteria in the milk metabolize the lactose sugar, converting it into lactic acid. This is a chemical reaction.

2. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds.

3. The remaining liquid, which contains whey proteins and water, is the whey.

4. This process changes the taste, smell, and texture of the milk, which are all indicators of a chemical change.

5. Unlike a physical change, this process cannot be reversed, which is another characteristic of a chemical change.

Question

The souring of milk is a chemical change. Here's why:

1. The process begins when bacteria in the milk metabolize the lactose sugar, converting it into lactic acid. This is a chemical reaction.

2. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds.

3. The remaining liquid, which contains whey proteins and water, is the whey.

4. This process changes the taste, smell, and texture of the milk, which are all indicators of a chemical change.

5. Unlike a physical change, this process cannot be reversed, which is another characteristic of a chemical change.

Knowee AI · Accepted Answer

The souring of milk is a chemical change. Here's why:

1. The process begins when bacteria in the milk metabolize the lactose sugar, converting it into lactic acid. This is a chemical reaction.

2. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds.

3. The remaining liquid, which contains whey proteins and water, is the whey.

4. This process changes the taste, smell, and texture of the milk, which are all indicators of a chemical change.

5. Unlike a physical change, this process cannot be reversed, which is another characteristic of a chemical change.

Is milk going sour a physical or chemical change?