GK
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Which of the following IS a chemical change
|
|
using chalk
|
|
|
water freezing
|
|
|
slicing cheese
|
|
|
digestion
|
|
|
cellular respiration
|
Explanation:
Detailed explanation-1: -Respiration is a chemical change as new substances like carbon dioxide and water are formed. Also there is change in the mass as glucose is oxidised by oxygen and heat is released. This change is permanent. All these factors conclude that respiration is a chemical change.
Detailed explanation-2: -The products of cellular respiration are energy (or ATP), carbon dioxide, and water.
Detailed explanation-3: -Specifically, during cellular respiration, the energy stored in glucose is transferred to ATP (Figure below). ATP, or adenosine triphosphate, is chemical energy the cell can use. It is the molecule that provides energy for your cells to perform work, such as moving your muscles as you walk down the street.
There is 1 question to complete.