please it is urgent friends all of these questions class :- 6th lessson:- changes around up please ya
Answers
Explanation:
1) so that it could expand and fit on the Tim
2) formation of clouds can be reversed by condensation.
3)burning of cracker releases sound , light and smell.
4)so that is summer by expansion of iron, it could be filled.
5) idk
6(idk
7)all are physically
8)all are physical
9)none of these.
10)both
11)all
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1 because metal expands on heating and it get fit in the cartwheel.
2 formation of clouds is usually a physical change because change of water into cloud can be reversed by condensation.
3 Explosion of a cracker is a chemical change because the explosive reactants are transformed into gaseous products along with heat, light and sound which cannot be reversed. Hence, it is a chemical change.
4 because it allows railway tracks to expand in the hot weather season.
5 because Eiffel Tower is made up of metal and as we know that metal expands on heating and contract on cooling. So height of Eiffel Tower increase in summer and decrease in winter.
8 Mixing water and clay is irreversible change.
Making toys from dough is reversible change.
Baking toys is irreversible change.
Crushing the toys is irreversible change.
9 (a) water to ice or water vapour to water
(b) melting (melting of ice)
(b) reversible change
Explanation:
9th (a) not fully sure