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'Soured' means: lactic acid is (microbiologically) formed out of lactose:
(THIS is a chemical change)
C12H22O11 --> (among other compounds) C3H6O3
by anaerobic homofermentative Lactobacillus spp.
IUPAC name: 2-hydroxypropanoic acid = lactic acid = CH3CHOHCOOH
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoChemical changes are permanent. The souring of milk causes a permanent chance, it can't go back to being fresh again. The souring of milk is usually caused by bacteria. The bacteria reacts with the lactose and breaks it up to form lactic acid. Lactic acid has a sour taste. An additional effect of this interaction is that milk protein, also known as casein, coagulates causing the milk to break down into both a watery substance as well as a thick and lumpy one.
Wiki User
∙ 11y agoYes , souring of milk is a chemical change because once the milk get converted into cheese or curd by adding a drop of lemon in milk it turns into cheese and we cannot get the original substance back.
Wiki User
∙ 6y agoYes, it is a chemical change.
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What is a simple sentence using the word chemical formula?
This is a simple sentence using the words "chemical formula".
What are 5 key words in a chemical change?
These are: reaction, chemical formula, reactant, product, chemical equation.
Is combustion a physical change or a chemical change?
Combustion is basically a chemical reacting with oxygen to become the oxide and water is produced. So when alcohol combusts, for example, it is changed (burned) to carbon dioxide and water. In other words, there is a chemical change.
What is the term for a substance undergoing a chemical change?
The other term for a chemical change is a chemical reaction. They both refer to a reaction between different components chemically to make a product that is different from them in terms of chemical structure.
Is sand flowing through an hour glass an chemical or physical change?
It is not really a change, at all. Sand is moving from one spot to another. If it truly had to be categorized, I would put it under a physical change. A physical change would be a change in an object you can see with your eyes. However, the chemical makeup of that object does not change. In other words, no new chemical is formed. For example, water may freeze or evaporate, but the chemical makeup of water, no matter what state it is in, is H2O. A chemical change would would result in the formation of one or more new chemicals. For example, burning paper is a chemical change. You have paper and fire, and when you burn the paper up, it gives off CO2, and charred paper, which is different from regular paper.
What is a simple sentence using the word chemical formula?
This is a simple sentence using the words "chemical formula".
What are 5 key words in a chemical change?
These are: reaction, chemical formula, reactant, product, chemical equation.
Chemical change is what?
A process in which reactants are changed into one or more different products
Is combustion a physical change or a chemical change?
Combustion is basically a chemical reacting with oxygen to become the oxide and water is produced. So when alcohol combusts, for example, it is changed (burned) to carbon dioxide and water. In other words, there is a chemical change.
If a new substance is produced is it a chemical change?
Correct; a chemical change produces a new substance, or in other words, an existing substance changes into a different substance.
What is the term for a substance undergoing a chemical change?
The other term for a chemical change is a chemical reaction. They both refer to a reaction between different components chemically to make a product that is different from them in terms of chemical structure.
How do you change compound sentence into simple?
Take out the conjunction (words like 'and' 'but' etc.) and replace with a period, you then have two simple sentences.
Is this a chemical change or physical change water freezes and turns into ice?
It's a physical change because the substance is the same before and after only changing form. In other words, water's chemical formula is H2O and ice's chemical formula is also H2O, so they are the same substance. Therefore it is a physical change.
Is painting a room a chemical change?
Paneling a room, or in other words applying wood panels to the walls of a room in order to modify the look and feel of the room, would be a physical change and not a chemical change because you are changing the physical properties of the room and not the chemical composition of the room.
Is sand flowing through an hour glass an chemical or physical change?
It is not really a change, at all. Sand is moving from one spot to another. If it truly had to be categorized, I would put it under a physical change. A physical change would be a change in an object you can see with your eyes. However, the chemical makeup of that object does not change. In other words, no new chemical is formed. For example, water may freeze or evaporate, but the chemical makeup of water, no matter what state it is in, is H2O. A chemical change would would result in the formation of one or more new chemicals. For example, burning paper is a chemical change. You have paper and fire, and when you burn the paper up, it gives off CO2, and charred paper, which is different from regular paper.
Does a chemical change occur when a piece of wood is painted?
When you burn wood a chemical change occurs.
What happens to matter when it undergoes a physical and chemical change?
A chemical change cant be undone and a new substance, so in other words you cant reverse the effects and in the end you get ashes. An example of a chemical change would be burning paper and getting ashes. A physical change can be undone. An example of a physical change would be bending the paper because you can still get the paper back and no new substance is created.
