Question

Identify the following changes whether Physical or Chemical and also mention the new product formed (if any) in each case. A.Colouring a paper with crayons
B. Burning of magnesium ribbon
C. Making dough from flour(Atta)
D. Mixing acid and a base​

Answer 1

Answer:

chemical, physical,physical ,chemical

Explanation:

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Answer 2

Explanation:

Ans A) Physical change.. As colouring a paper is reversible change as no new products are formed.

here both original and final products both are coloured paper.

AnsB) Burning of Magnesium Ribbon is a chemical change because by burning magnesium we get magnesium oxide.

It's a permanent change and we can't get back the original substance.

Ans C) It is a physical change as making a dough from Atta no new products are formed.

here original and final products both are Atta.

Ans D) It is a Chemical change because When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt.

It is permanent and we can't get back the original substance..

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