classify the following as physical or chemical change give reason for your answer : (a) burning of a candle (b) melting of ice (c) burning of petrol in an engine (d) change of colour of iron bar on strong heating (e)
Churning of milk to get butter
Answers
Answer:
a) chemical change
b) physical change
c) chemical change
d) chemical change
e) chemical change
I hope it help you!!!
Answer:
(a) chemical change.
(b) physical change.
(c) chemical change.
(d) physical change.
(e) chemical change
Explanation:
(a) When a candle burns, the oxygen in the air reacts and forms carbon dioxide. A new substance, the CO2 is formed. So it is a chemical change.
(b) When you melt an ice cube (H2O), you have a physical change because you add energy. You added enough energy to create a phase change from solid to liquid. Physical actions, such as changing temperature or pressure, can cause physical changes.
(c) They undergo oxidation or combustion upon burning to form carbon dioxide and water vaporous along with heat energy. Therefore, it is a chemical change.
(d) Heating a iron rod is a physical change, as when it is cooled, it can come back to its original state. No new compound is formed. That means it is a reversible physical change
(e) Search Results
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churning of milk cream to get butter is a chemical change because in this method the chemical properties of the milk are changed, and a new substance is formed with a different taste smell and color. So churning of milk cream to get butter is a chemical change.