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Thickness of ice on lake's surface is 5 cm. Find time required for ice's thickness to double. Data in description.
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Thickness of ice on lake's surface is 5 cm. Find time required for ice's thickness to double. Data in description.
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Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.
In case of ice the water molecules have low energy while in the case of steam the water molecules have high energy. The high energy of water molecules in steam...
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What happens when a. Dilute sulphuric acid is poured on a copper plate? b. Iron nails are placed in copper sulphate solution?
(a) When dilute sulphuric acid is poured on a copper plate, there will be evolution of hydrogen gas along with the formation of blue color crystals of copper sulphate. CuSO4 +...
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A ball is dropped from a height of 10m. If the energy of the ball reduces by 40percent after striking ground, how high ball bounce
Solution: H1 =10 m, v1 =? Loss of energy =40% H2 =? On striking the floor, K.E = P.E ½ mv12 = mg H1 V1 = ?(2gH1)= ?( 2x9.8x10) V1= ?196= 14 m/s As the body loses 40% of its energy, final...
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What happens when dilute hydrochloric acid is added to iron filings? Choose the correct
The following reaction takes place: Fe + 2HCl -----> FeCl2 + H2 Iron Hydrochloric acid lron chloride Hydrogen Thus, hydrogen and iron chloride are produced. Therefore, (a) is the correct answer.
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An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will
(b) not flow from iron ball to water or from water to iron ball.
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Conversion of ice into water and water into ice is an example of change which can be reversed.
(i) Melting of wax (ii) Folding of a paper (iii) Knitting of a sweater (iv) Inflating of a tyre
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Solid A is a very hard electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?
It is a covalent solid such as SiO2, diamond, SiC, AlN, etc. Covalent solids (except graphite) have very high melting point and are insulators.
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An ice cube is suspended in vacuum in a gravity-free hall. As the ice melts it
(b) will change its shape to spherical Explanation: When the ice cube melts, it changes its state from solid to liquid. This melted liquid has open surfaces where the surface tension forces...
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