Give two reasons to justify:
(a) Water at room temperature is a liquid.
(b) An iron almirah is a solid at room temperature.
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Give an example of a metal which (i) is a liquid at room temperature. (ii) can be easily cut with a knife. (iii) is the best conductor of heat.
(i) Metal that exists in liquid state at room temperature → Mercury (ii) Metal that can be easily cut with a knife → Sodium, Potassium (iii) Metal that is the best conductor...
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Classify the following as chemical or physical changes: • cutting of trees, • melting of butter in a pan, • rusting of almirah,
Cutting of trees → Physical change Melting of butter in a pan → Physical change Rusting of almirah → Chemical change Boiling of water to form steam → Physical...
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Give two reasons to justify: (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature.
(a) At room temperature (25 °C), water is a liquid because it has the following characteristic of liquid: (i). At room temperature, water has no shape but has a fixed volume...
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When solid barium hydroxide and solid ammonium chloride are mixed in the test tube in a ratio of 2 : 1 by weight at room temperature then
(B) reaction proceeds with fall in temperature Mixing of solid barium hydroxide [Ba(OH)2] and solid ammonium chloride [NH4Cl] in a ratio of 2 : 1 by weight at room temperature in...
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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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A solid floats in a liquid in a partially dipped position. (a) The solid exerts a force equal to its weight on the liquid.
(a) The solid exerts a force equal to its weight on the liquid. (b) The liquid exerts a force of buoyancy on the solid which is equal to the weight of...
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A solid is completely immersed in a liquid. The force exerted by the liquid on the solid will
(c) decrease if it is taken partially out of the liquid (d) be in the vertically upward direction. EXPLANATION: The force exerted by the liquid on the solid is equal to the volume...
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A liquid can easily change its shape but a solid can not because (a) the density of a liquid is smaller than that of a solid
(b) the forces between the molecules is stronger in solid than in liquids EXPLANATION: The shape will change only if the molecules have some freedom of movement. In a solid the forces...
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A solid is completely immersed in a liquid. The force exerted by the liquid on the solid will (a) increase if it is pushed deeper inside the liquid
(c) decrease if it is taken partially out of the liquid (d) be in the vertically upward direction. EXPLANATION: The force exerted by the liquid on the solid is equal to the volume...
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The contact angle between a solid and a liquid is a property of (a) the material of the solid
(a) the material of the solid (b) the material of the liquid Explanation: The contact angle between a solid and a liquid depends on the materials of the solid and the liquid. The...
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