Question

please tell me the answer​

Answer 1

Answer:

1- Physical Change- A change that causes a change in size ,shape,or colour.

Chemical change - A change in its chemical nature.

2-Physical Change-Coloring of hair

Rest are chemical changes.

I didn't know the rest.

SORRY....

Answer 2

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(i) In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. The distinction between physical and chemical change is not clear cut.

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(i) An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge past a region.

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(ii) (a) Heating effect is the effect that is used in electric iron . It is the rate of flow of charge through any conductor .

(b) An electric bell works with the help of an electromagnet. It is made up of a coil of wire wound round an iron piece, resembling an electromagnet. When current passes through it, a magnetic field is produced. When the circuit is complete, the hammer of the bell is attracted towards the electromagnet.

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(iii) If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.