three use of chemical change
Answers
Answer:
A chemical change involves formation of a new substance, and the chemical properties of the new substance are different from that of the reacting substances.
A change in color indicates a chemical change.
A chemical change is usually accompanied by a gain or loss of energy.
Sometimes, a change in odor is an indication of a chemical change.
A chemical change is accompanied by the formation of gases, or the formation of a solid in the form of precipitate.
A chemical change is irreversible i.e. it cannot be undone.
Examples of Chemical Change
A very common example of a chemical change is the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) to form sodium chloride (NaCl) or table salt. Here are some examples of chemical changes that we come across in our everyday life, placed under two categories: organic and inorganic.
Changes Involving Organic Compounds
Organic compounds are complex compounds of carbon in which one or more atoms of carbon are covalently linked to atoms of other elements, such as hydrogen, nitrogen, and oxygen. Here are a few examples of some chemical changes that involve these compounds.
Formation of Yogurt from Milk
yogurt
Yogurt is formed as a result of bacterial action on milk. When certain bacteria, such as Streptococcus thermophilus and Lactobacillas bulgaricus, are added to warm milk and is allowed to ferment, lactic acid is formed. The formation of lactic acid causes the milk to curdle. It is a chemical change because a new substance is formed, and the change from milk to yogurt is irreversible.
Formation of Wine from Grapes
wine fermentation
Wine is formed by the fermentation of grape juice. Fermentation is an anaerobic chemical reaction in which simple sugars are converted to ethyl alcohol, and carbon dioxide is formed as a by-product. The reaction takes place when yeast, an anaerobic fungi, acts on the sugars present in grapes. It is a chemical change characterized by the emission of a gas (carbon dioxide), along with the formation of a new substance.
Baking a Cupcake
cup cake
When you mix cake ingredients and put it in the oven, the baking soda or sodium bicarbonate (NaHCO3) breaks down to form sodium carbonate (Na2CO3) and bubbles of carbon dioxide. This makes the cake fluffy and soft. In addition to this, the heat causes protein molecules in the egg yolk to form new bonds. Baking a cake is an irreversible process. Also, it leads to the formation of a new substance, and hence, is a chemical change.
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Answer:
. it cannot be reversed.
it cannot be reversed.. it forms a new substance.
it cannot be reversed.. it forms a new substance.. new properties of chemical is formed
Explanation:
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