ANSWER THE FOLLOWING QUESTIONS : Which change is associated with melting of ice ?
Which change is a temporary change ?
How does magnesium burn?
What is the colour of magnesium oxide formed ?
Define physical change.
Define chemical change.
Give any three characteristics of physical change.
Give any three characteristics of chemical change. Differentiate physical and chemical change.
Explain how burning of magnesium can be classified as a chemical change.
Answers
Answer:
1)physical change
2)physical change is a temporary change while chemical change is a permanent change.
3)When magnesium reacts with oxygen, it produces light bright enough to blind you temporarily
4)white
5)A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible.
6)when one chemical substance is transformed into one or more different substances
7):it is a temporary change. 2:it is a reversible change. 3:no new sunatance is formed.
8)Evolution of gas.
Formation of a precipitate.
Change in color.
9)When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
Physical change is a temporary change. A chemical change is a permanent change.
A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition
A physical change involves very little to no absorption of energy. During a chemical reaction, absorption and evolution of energy take place.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.
Answer:
A physical change is generally reversible. In such a change no new substance is formed. Let us now consider the other kind of change.
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Explanation: