which of the following statement is correct (a) evaporation is chemical change (b) digestion of food is chemical change (c) burning of paper is physical change (D) all of these
Answers
Answer:
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B)Digestion of food is a chemical change.
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Answer:
(A) EVAPORATION IS CHEMICAL CHANGE.
FALSE...
The evaporation of water is a physical change. When water evaporates, it changes from the liquid state to the gas state, but it is still water; it has not changed into any other substance...
For example, hydrogen burning in air undergoes a chemical change in which it is converted to water.
(B) DIGESTION OF FOOD IS CHEMICAL CHANGE.
TRUE...
Mechanical digestion occurs in the mouth, stomach, and small intestine. Food is chemically changed in digestion when new, smaller substances are formed. These chemical changes are examples of chemical digestion. Chemical digestion begins in the mouth when enzymes in saliva begin to break down carbohydrates.
(C) BURNING OF PAPER IS PHYSICAL CHANGE.
FALSE...
A physical reaction occurs when the physical state of the substance remains the same despite what has happen to it. For instance, the tearing of paper is physical as it's still paper even when you tear it. A chemical reaction is when the substance is chemically change. a chemical reaction also can't be reversed.
When paper is burn, the cellulose in the air reacts with the oxygen to form carbon dioxide and water. Also, the action of burning paper can't be reversed.